14), and [Male], 40757, testis 5 x 3 mm., 15.3 gm. (July 14), 7-1/2
km. W Escarcega; [Female], 40755, ovary 6 x 3 mm. (ova to 1 mm.),
12.7 gm. (July 21), Piste; [Male], 40756, ovary 4 x 3 mm., 16.8 gm.
(August 3), 4 km. WSW Puerto Juarez.
_Troglodytes musculus_ (Naumann): Southern House Wren.--Specimen (1):
[Female], 40760, juv. (August 2), 4 km. WSW Puerto Juarez.
_Troglodytes beani_ (Ridgway): Cozumel Wren.--Specimens (2): [Female],
40761, 13.3 gm. (August 9), and [Male], 40762, imm., 13.6 gm. (August
9), 3-1/2 km. N San Miguel, Isla Cozumel.
_Campylorhynchus yucatanicus_ (Hellmayr): Yucatan Wren.--This species
was abundant in the coastal scrub west of Sisal where some breeding
activity was noted. A few individuals were carrying nest material and
several were feeding young. There were many old and abandoned nests and
apparently the breeding season was nearly over. The only previous
breeding record is for March 19 when a newly completed nest was found
(Paynter, 1955a:218).
Specimens (4): [Male], 40750, imm., 32.4 gm. (August 7), 1-1/2 mi.
SW Sisal; [Female], 40751, imm., 31.2 gm. (August 18), 2 km. WSW
Sisal; [Female], 40752, ovary 7 x 3 mm., 40 gm. (August 9), 4.3 km.
WSW Sisal; [Female], 40753, 31.0 gm. (August 11), 6-1/2 km. WSW
Sisal.
_Melanoptila glabrirostris cozumelana_ (Paynter): Black Catbird.--
Apparently the only previous record of breeding by this species was
Paynter's (1955b) mention of a male from Quintana Roo with enlarged
gonads on June 26. The three adults in the collection here reported on
were in nearly full reproductive activity.
Specimens (4): [Male], 40764, imm., 40.5 gm. (August 8), [Female],
40767, testis 8 x 4 mm., 42.0 gm., heavy fat (August 8), [Female],
40765, ovary active (oviduct enlarged), brood patch, 35.2 gm.
(August 10), and [Male], 40766, testis 9 x 6 mm., 35 gm. (August
10), from 2-1/2-3-1/2 km. N San Miguel, Isla Cozumel.
_Mimus gilvus_ (Vieillot): Tropical Mockingbird.--The only breeding
record heretofore is by Paynter (1955a:226) of newly-fledged juveniles
taken on May 26 and 29. Gonads in our adults were moderately active;
feathers were extremely worn, but molting was not evident.
Specimens (4): [Male], 40771, testis 9 x 6 mm., 51.0 gm. (July 9),
5 km. S Champoton; [Female], 40770, ovary moderately active (ova to
2 mm.), brood patch, 42 gm., moderate fat (August 9), 3-1/2 km. N
San Miguel, Isla Cozumel; [Female], 40768, imm., 45.2 gm., moderate
fat (August 18), 2 km. WSW Sisal; [Male], 40769, testis 10 x 5 mm.,
51.8 gm. (August 9), 13 km. WSW Sisal. Mallophaga: _Myrsidea_ sp.,
July 9.
_Toxostoma guttatum_ (Ridgway): Cozumel Thrasher.--Our specimen had
enlarged testes and seems to represent the first record of breeding
activity in the species.
Specimen (1): [Male], 40772, testis 7 x 4 mm., 49.5 gm. (August
10), 3-1/2 km. N San Miguel, Isla Cozumel.
_Turdus grayi_ Bonaparte: Clay-colored Robin.--Four adults were in full
breeding condition.
Specimens (6): [Male], 40780, testis 13 x 8 mm., brood patch (July
10), 5 km. S Champoton; [Female], 40781, ova to 8 mm., 79.6 gm.
(July 15), 5 km. SW Escarcega; [Female], 40776, 61.3 gm. (July 21),
Piste; [Female], 40777, imm., 63.4 gm. (July 20), 61/2 km. W Piste;
[Male], 40779, testis 14 x 8 mm., brood patch, 68.5 gm. (July 30),
and [Male], 40778, testis 13 x 11 mm., 71.5 gm. (July 28), Pueblo
Nuevo X-can.
_Polioptila caerulea_ (Linnaeus): Blue-gray Gnatcatcher.--A fledgling
taken at Piste was barely flying with remiges and rectrices ensheathed
basally. Previous breeding records are for April 11 and 27 (Paynter,
1955a:231). A male taken on August 10 on Isla Cozumel had nearly
completed molting into winter plumage.
Specimens (8): [Female], 40788, fledgling, 5.0 gm. (July 20), 6-1/2
km. W Piste; [Male], 40787, testis 2 x 1 mm., 5.6 gm. (July 21),
[Male], 40785, juv., 5.8 gm. (July 22), and [Female], 40786, 5.6
gm. (July 22), Piste; [Female], 40791, juv., 5.6 gm. (August 8),
[Male], 40790, juv., 5.8 gm. (August 8), [Female], 40789, 5.7 gm.
(August 9), and [Male], 40792, 5.3 gm., molting--7th primaries
ensheathed (August 10), from {2-1/2}-{3-1/2} km. N San Miguel, Isla
Cozumel.
_Polioptila albiloris_ Lawrence: White-lored Gnatcatcher.--This species
was abundant in the arid scrub along the coast in the vicinity of
Sisal.
Specimens (2): [Male], 40783, testis 1 mm., 6.2 gm. (August 7),
1-1/2 mi. S Sisal; [Male], 40784, testis 1 mm., 5.8 gm. starting to
molt--1st and 2nd primaries ensheathed (August 10), 13 km. WSW
Sisal.
_Ramphocaenus rufiventris_ (Bonaparte): Long-billed Gnatwren.--Specimen
(1): [Female], 40793, imm. skull, 9.8 gm. (July 15), 7-1/2 km. W
Escarcega.
_Cyclarhis gujanensis insularis_ Ridgway: Rufous-browed Pepper-shrike.
--Specimen (1): [Male], 40794, testis 2 mm., 37.8 gm., molting--4th
primaries ensheathed (August 9), 4 km. N San Miguel, Isla Cozumel.
_Vireo bairdii_ (Ridgway): Cozumel Vireo.--Specimens (4): [Female],
40795, ovary inactive, 12.7 (August 8), [Male], 40796, testis 2 mm.,
12.6 gm., molting--3rd and 4th primaries ensheathed (August 10),
[Female], 40797, ovary inactive, 12.5 gm., molting--3rd primaries
ensheathed (August 10), and [Male], 47098, imm., 13.1 gm. (August 10),
from 2-1/2-3-1/2 km. N San Miguel, Isla Cozumel.
_Vireo pallens semiflavus_ (Salvin): Mangrove Vireo.--Paynter
(1955a:236) noted breeding by this species from April 7 through June.
Specimens (2): [Female], 40800, ova to 3 mm., oviduct enlarged
(July 8), Isla del Carmen; [Female], 40799, ovary inactive, 11.1
gm., molting--4th primaries ensheathed (August 2), Isla Mujeres.
_Vireo flavoviridus flavoviridus_ (Cassin): Yellow-green Vireo.--Paynter's
(1955a:238) data indicate breeding in this species from late May
through June; our records indicate that the species breeds at least
through July.
Specimens (12): [Male], 40812, testis 10 x 4 mm., 17.1 gm.,
molting--1st, 2nd, and 3rd primaries ensheathed (July 17), and
[Male], 40813, testis 7 x 4 mm., 18.2 gm. (July 17), 1 km. N, 13
km. W Escarcega; [Female], 40803, ovary 9 x 5 mm., ova to 1 mm.,
brood patch (July 21), [Male], 40805, testis 11 x 6 mm., 18.5 gm.
(July 21), [Male], 40804, 18 gm. (July 21), and [Female], 40802,
ovary slightly enlarged, molting--2nd and 3rd primaries ensheathed
(July 21), all from Piste; [Male], 40806, 17.5 gm., molting--1st
primaries ensheathed (July 21), 6-1/2 km. W Piste; [Female], 40808,
ovary 5 x 3 mm., 17.4 gm. (July 28), [Male], 40807, testis 5 x 3
mm., 17.7 gm., molting--3rd and 4th primaries ensheathed (July 28),
[Male], 40809, testis 2 x 1 mm., 17.5 gm. (July 29), and [Male],
40810, testis 3 x 2 mm., 18.7 gm., molting--1st, 2nd, 3rd, and 4th
primaries ensheathed (July 30), from Pueblo Nuevo X-can; [Male],
40811, testis 3 x 1 mm., 18.7 gm., molting--4th, 5th, and 6th
primaries and middle pair of rectrices ensheathed (August 14), 4
km. NNE Felipe Carrillo Puerto. Mallophaga: _Philopterus_ sp.
July 21.
_Vireo magister_ (Lawrence): Yucatan Vireo.--Breeding on the peninsula
has not been recorded previously. A male, beginning to molt, taken on
August 10 on Isla Cozumel had enlarged testes, which were apparently
regressing.
Specimens (3): [Female], 40814, ovary inactive, 17.7 gm. (August
2), Isla Mujeres; sex? 40815, 19.5 gm. (August 9), and [Male],
40816, testis 6 x 3 mm., 20.2 gm., molting--1st, 2nd, and 3rd
primaries ensheathed (August 10), 3-1/2 km. N San Miguel, Isla
Cozumel.
_Cyanerpes cyaneus carneipes_ (Sclater): Blue Honeycreeper.--Paynter
(1955a:283) collected specimens that were breeding in April. Testes
were fully enlarged in two August-taken specimens and courtship rituals
were observed in two pairs seen on August 3 at Puerto Juarez.
Specimens (3): [Male], 40817, 15.5 gm. (July 21), 6-1/2 km. W
Piste; [Male], 40818, testis 12 x 6 mm., 12.1 gm. (August 3), 4 km.
WSW Puerto Juarez; [Male], 40819, testis 8 x 6 mm., 11.6 gm.
(August 14), 4 km. NNE Felipe Carrillo Puerto.
_Coereba flaveola caboti_ (Ridgway): Bananaquit.--Specimen (1):
[Female], 40820, ovary inactive, 5 x 3 mm., 11.0 gm., molting--1st and
2nd primaries ensheathed, 3rd and 4th primaries missing (August 10),
3-1/2 km. N San Miguel, Isla Cozumel.
_Dendroica petechia rufivertex_ (Ridgway): Yellow (Golden) Warbler.
--Specimens (5): [Female], 40831, ovary inactive, 8.0 gm. (August 8),
sex?, 40832, imm. (fresh, first winter plumage), 10 gm. (August 8),
[Female], 40830, ovary inactive, 10.0 gm., molting--4th and 5th
primaries ensheathed (August 9), [Female], 40833, ovary inactive, 8.5
gm. (August 9), and [Female], 40834, ovary inactive, 7.8 gm. (August
10), all from 3-1/2-4 km. N San Miguel, Isla Cozumel.
_Dendroica petechia bryanti_ (Ridgway): Yellow (Mangrove) Warbler.--
Previous records of breeding by this species are available for March 29
and 30 and May 16 (Paynter, 1955a:247). Breeding apparently continues
at least into July. An adult male with moderately enlarged testes
(probably regressing) was taken on July 7 at Zacatel, Campeche, and a
juvenile was obtained 13 km. WSW Sisal on August 10. The male at
Zacatal was in mangroves alongside the ferry landing (for the ferry
from Isla del Carmen) and seems to be the first specimen of this
subspecies recorded for the state.
Specimens (7): [Male], 40829, testis 4 x 2 mm., 11.1 gm.,
molting--1st, 2nd, and 3rd primaries ensheathed (July 7), Zacatal,
Campeche; [Male], 40823, imm., 10.0 gm. (August 9), [Male], 40824,
testis 1 mm., 13.0 gm., molting--4th and 5th primaries and middle
three rectrices ensheathed (August 9), [Male], 40826, juv., 10.1
gm. (August 10), [Male], 40827, imm. (fresh, first winter plumage),
10.2 gm. (August 10), sex?, 40825, 10.3 gm. (August 10), and
[Male], 40828, testis 2 mm., molting--7th, 8th, and 9th primaries,
2nd, and 3rd secondaries and outer pair of rectrices ensheathed
(August 11), all from 13 km. WSW Sisal.
_Seiurus motacilla_ (Vieillot): Louisiana Waterthrush.--Our specimen,
apparently an early migrant, was taken near the aguada at Rancho San
Miguel.
Specimen (1): [Male], 40835, testis minute, 19.9 gm. (August 14), 4
km. NNE Felipe Carrillo Puerto.
_Tangavius aeneus aeneus_ (Wagler): Red-eyed Cowbird.--A male having
enlarged testes taken on August 14 seems to be the first record of
breeding in the species for the peninsula.
Specimens (2): [Male], 40838, testis 11 x 7 mm., 66.9 gm. (August
14), and [Female], 40839, ovary 6 mm., 60 gm. (August 15), 4 km.
NNE Felipe Carrillo Puerto.
_Cassidix mexicanus_ (Gmelin): Boat-tailed Grackle.--Specimen (1):
[Male], 40840, 223.3 gm. (July 9), 1 km. SW Puerto Real, Isla del
Carmen.
_Dives dives dives_ (Deppe): Sumichrast Blackbird.--This species
previously has been known to breed in May (Paynter, 1955a:263). The
specimens from July had moderately active ovaries.
Specimens (2): [Female], 40842, ovary 8 x 4 mm., 92 gm. (July 11),
5 km. SW Champoton; [Female], 40841, ovary 11 x 5 mm., 88.6 gm.
(July 21), Piste.
_Icterus prosthemelas_ (Strickland): Black-cowled Oriole.--Specimens
(2): [Female], 40843, ovary 5 x 3 mm., 28.8 gm., molting--extensive
body molt, 1st, 2nd, and 3rd primaries ensheathed (August 3), 4 km. WSW
Puerto Juarez; [Male], 40844, testis 2 x 1 mm., 31.0 gm., molting 1st,
2nd, 3rd, and 4th primaries ensheathed (August 16), 4 km. NNE Felipe
Carrillo Puerto.
_Icterus mesomelas_ (Wagler): Yellow-tailed Oriole.--Our specimens
extend the known breeding season; previous records are for April and
May (Paynter, 1955a:265).
Specimens (4): [Male], 40848, testis 11 x 5 mm. (July 14), 7-1/2
km. W Escarcega; [Male], 40846, juv. (rectrices and remiges
ensheathed basally), 30.3 gm. (July 29), and [Male], 40847, testis
12 mm., 38.0 gm. (July 29), Pueblo Nuevo X-can; [Female], 40845,
ovary 6 x 3 mm., 32.5 gm. (August 4), 4 km. WSW Puerto Juarez.
_Icterus auratus_ Bonaparte: Orange Oriole.--Paynter (1955a:266)
reported breeding specimens taken in April and May. Two males taken in
late July had fully enlarged testes.
Specimens (2): [Male], 40849, testis 10 x 6 mm., 32.5 gm. (July
28), Pueblo Nuevo X-can; [Male], 40850, testis 11 x 7 mm., 33.0 gm.
(July 30), 1-1/2 km. S, 1 km. E Pueblo Nuevo X-can.
_Icterus gularis_ (Wagler): Black-throated Oriole.--Breeding in this
species was reported by Paynter (1955a:267) only for the month of
April. Breeding was apparently nearing an end in late July at Piste,
where several juveniles were taken. Adult males had moderately enlarged
testes.
Specimens (8): [Male], 40858, testis 5 x 3 mm., 67.2 gm. (July 20),
6-1/2 km. W Piste; [Male], 40853, 59.0 gm. (July 21), [Female],
40851, imm., 49.9 gm. (July 21), [Male], 40852, 56.4 gm. (July 21),
[Female], 40855, imm., 49.9 gm. (July 22), [Female], 40856, ovary
inactive, 50.0 gm. (July 22), [Male], 40854, testis 6 x 4 mm., 63.8
gm. (July 22), and [Male], 40857, juv. (all rectrices and remiges
ensheathed basally), 30.4 gm. (July 27), all from Piste.
_Icterus cucullatus_ Nelson: Hooded Oriole.--This species has not
heretofore been recorded as breeding on Isla Cozumel; testes were
nearly fully enlarged but probably regressing in the only specimen
taken there. It had been banded (USF&WS no. 601-87003) on the island in
1961 as an adult. According to Paynter (1955a:269) there are no
breeding records for this species on the mainland later than April,
March 25 being the earliest date. The species was observed nesting on
Isla del Carmen and adult males taken there and 5 km. S Champoton in
early July were in full breeding condition.
Specimens (6): [Male], 40863, testis 11 x 7 mm., 26.3 gm. (July 8),
[Female], 40864, 31.4 gm. (July 8), and [Male], 40862, testis 11 x
5 mm., 24.7 gm. (July 8), 1 km. SW Puerto Real, Isla del Carmen;
[Male], 40860, 26.5 gm. (July 9), and [Male], 40861, testis 10 x 5
mm., 20.9 gm. (July 11); 5 km. S Champoton; [Male], 40859, testis 8
x 5 mm., molting--7th primaries ensheathed, 27.0 gm. (August 8),
3.5 km. N San Miguel, Isla Cozumel.
_Tanagra affinis affinis_ Lesson: Lesson Euphonia.--Specimens (2):
[Female], 40866, 8.8 gm. (July 22), Piste; [Male], 40865, testis 3 x 2
mm., 10.0 gm. (August 3), 4 km. WSW (Aeropuerto) Puerto Juarez.
_Tanagra lauta lauta_ Bangs and Penard: Thick-billed
Euphonia.--According to Paynter (1955a:272), the only breeding record
previously available is that of a male having slightly enlarged testes
on February 12. Males taken on July 15 and on August 14 had fully
enlarged testes; the gonads of several other specimens were apparently
regressing, two specimens had begun to molt, and juveniles were molting
into first winter plumage.
Specimens (9): [Male], 40874, testis 7 x 4 mm. (July 15), and
[Female], 40875, ova to 1 mm. (July 15), 7-1/2 km. W Escarcega;
[Male], 40869, testis 6 x 4 mm., 14.5 gm. (August 14), [Male],
40870, testis 2 mm., 14.5 gm., molting--5th primaries ensheathed
(August 14), [Male], 40867, imm., 12.6 gm. (August 14), [Female],
40868, imm., 14.4 gm. (August 14), [Male], 40871, testis 2 mm.,
14.4 gm., molting--2nd, 3rd, and 4th primaries ensheathed (August
14), [Female], 40872, ovary granular, 7.8 gm. (August 14), and
[Female], 40873, ovary granular, 13.0 gm. (August 15), all taken 4
km. NNE Felipe Carrillo Puerto.
_Thraupis abbas_ (Deppe): Yellow-winged Tanager.--Paynter (1955a:273)
reported breeding in this species in late April and late June. Gonads
in our specimens were moderately active.
Specimens (2): [Male], 40877, testis 6 x 4 mm., 43.0 gm.,
molting--1st and 2nd primaries ensheathed (July 15), 1 km. N, 13
km. W Escarcega; [Female] 40876, ovary 7 x 4 mm., (ova to 1 mm.),
42.1 gm. (July 29), Pueblo Nuevo X-can.
_Spindalis zena benedicti_ Ridgway: Stripe-headed Tanager.--Two males
in advanced molt but with enlarged gonads were taken on August 9 and 10
and seem to be the first records indicating breeding in this species on
Isla Cozumel.
Specimens (3): [Male], 40878, testis 9 x 7 mm., 32 gm.,
molting--5th primaries and middle pair of rectrices ensheathed
(August 9), [Male], 40880, testis 5 x 3 mm., 30.0 gm.,
molting--3rd, 4th, 5th primaries and middle two pairs of restrices
ensheathed (August 10), and [Female], 40879, ovary inactive, 28.1
gm., molting--remiges are new; secondary coverts ensheathed (August
10), 3-1/2 km. N San Miguel, Isla Cozumel.
_Piranga roseogularis_ (Cabot): Rose-throated Tanager.--Breeding has
been previously recorded from March 17 through May 11 (Paynter,
1955a:276). Our only specimen, a male in advanced molt, had enlarged
(regressing) testes.
Specimen (1): [Male], 40881, testis 7 x 5 mm., 24.2 gm.,
molting--4th and 5th primaries ensheathed (August 15), 4 km. NNE
Felipe Carrillo Puerto.
_Habia gutturalis_ (Sclater): Red-throated Ant-tanager.--The only
breeding records previously available for this species on the peninsula
are for May 18 (Paynter, 1955a:280) and June 25 (Paynter, 1955b).
Specimens taken between July 14 and August 2 were in full breeding
condition. A male (40882) and female (40883) taken 7-1/2 km. W
Escarcega were known to be mated. Plumages in all specimens are worn
and for that reason specimens were not identified to subspecies.
Specimens (6): [Male], 40882, testis 14 x 9 mm., 38.9 gm. (July
14), [Female], 40883, ovary 5 x 5 mm., 29.0 gm. (July 14), and
[Male], 40887, testis 10 x 7 mm. (July 16), 7-1/2 km. W Escarcega;
[Male], 40885, juv. (rectrices and remiges ensheathed basally)
(July 28), and [Female], 40886, ovary moderately active, 30.5 gm.,
molting--2nd primaries ensheathed (July 28), Pueblo Nuevo X-can;
[Male], 40884, testis 15 x 8 mm. (August 2), 4 km. WSW Puerto
Juarez.
_Saltator atriceps_ (Lesson): Black-headed Saltator.--Previously,
breeding has been noted in this species in February, March, and April
(Paynter, 1955a:284). A male taken on July 16 was in full breeding
condition.
Specimens (3): [Male], 40895, testis 15 x 9 mm., 80.4 gm. (July
16), and [Female], 40896, 73.5 gm. (July 17), 7-1/2 km. W
Escarcega; [Male], 40894, 71.6 gm. (July 29), Pueblo Nuevo X-can.
_Saltator coerulescens_ (Vieillot): Gray Saltator.--The only previous
breeding record for this species is for April 26. Our one specimen, No.
40897, a juvenal male barely able to fly, taken on July 21 at Piste,
weighed 43.8 grams.
_Richmondena cardinalis_ (Linnaeus): Cardinal.--The only record of
breeding previously reported is of a male with enlarged testes taken on
June 4 (Paynter, 1955a:287). Adult males with enlarged testes were
obtained on July 11 and August 10, and three juveniles were taken
southwest of Sisal on August 10, 16, and 18.
Specimens (7): [Male], 40903, testis 9 x 7 mm., 39.7 gm. (July 11),
and [Female], 40904, 34.0 gm. (July 11), 5 km. S Champoton; [Male],
40898, testis 7 x 4 mm., 33.8 gm. (August 10), and [Female], 40899,
juv. (rectrices and remiges ensheathed basally), 32.8 gm. (August
10), 13 km. WSW Sisal; [Male], 40900, fledgling, 18.4 gm. (August
18), 2 km. WSW Sisal; [Female], 40901, ovary granular, 37.4 gm.,
molting--1st primaries ensheathed (August 15), and [Male], 40902,
imm., 34.0 gm. (August 16), 4 km. NNE Felipe Carrillo Puerto.
_Cyanocompsa parellina_ (Bonaparte): Blue Bunting.--Specimens (2):
[Male], 40906, imm. (July 15), and [Male], 40905, testis 10 x 7 mm.,
15.2 mm. (July 15), 7-1/2 km. W Escarcega.
_Tiaris olivacea pusilla_ (Swainson): Yellow-faced Grassquit.--The only
records of breeding, thus far, are by Paynter (1955a:291) for March 12
and June 14. A male (40907) taken 4 km. NNE Felipe Carrillo Puerto on
August 14 had fully enlarged testes (8 x 5 mm.).
_Tiaris olivacea intermedia_ (Ridgway): Yellow-faced Grassquit.--Although
females taken on Isla Cozumel exhibited no reproductive activity, two
males had moderately enlarged testes. These seem to be the first
records of breeding in this subspecies, which is endemic to Isla
Cozumel.
Specimens (5): [Male], 40908, testis 6 z 4 mm., 10.5 gm. (August
8), [Female], 40912, ovary inactive, 9.5 gm. (August 8), [Female],
40909, ovary inactive, 10.4 gm. (August 9), [Male], 40910, testis 5
x 3 mm., 11.5 gm., molting--1st primaries ensheathed (August 9),
and [Male], 40911, 11.5 gm. (August 10), all from {2-1/2}-{3-1/2}
km. N San Miguel, Isla Cozumel.
_Sporophila torquiola morelleti_ (Bonaparte): White-collared Seedeater.
--Breeding is known for this species in May and a male collected on
September 2 was in breeding condition (Paynter, 1955a:293). Our records
seem to be the first for the summer. Specimens taken in July and August
were breeding.
Specimens (7): [Female], 40918, 9.2 gm. (July 8), 1 km. SW Puerto
Real, Isla del Carmen; [Male], 40919, testis 7 x 6 mm., 8.2 gm.
(July 15), 7-1/2 km. W Escarcega; [Female], 40913, ovary inactive,
7.9 gm. (August 4), 4 km. WSW Puerto Juarez; [Male], 40914, testis
minute, 7.8 gm. (August 14), [Female], 40915, ova to 6 mm. (August
15), [Female], 40917, ovary moderately active, 7.0 gm. (August 16),
and [Male], 40916, testis 7 x 5 mm., 7.6 gm. (August 16), 4 km. NNE
Felipe Carrillo Puerto.
_Volatinia jacarina splendens_ (Vieillot): Blue-black Grassquit.--The
only previous record of breeding is a male having slightly enlarged
testes taken on June 1 (Paynter, 1955a:293). Our specimens showed
various stages of reproductive activity when taken on July 10.
Specimens (6): [Male], 40926, 8.9 gm. (July 10), and [Male], 40925,
testis 2 x 1 mm., 8.5 gm. (July 10), 1 km. S Puerto Real, Isla del
Carmen; [Male], 40924, testis 4 x 2 mm. (July 10), [Male], 40922,
testis 6 x 4 mm., 8.3 gm. (July 10), [Female], 40923, ova to 2 mm.,
10.3 gm. (July 10), and [Male], 40921, 8.2 gm. (July 10), 5 km. S
Champoton.
_Arremonops rufivirgata verticalis_ Ridgway: Olive Sparrow.--Apparently
the only previous record of breeding was the laying female on June 14
reported by Paynter (1955a: 294). Males collected in July and August
had enlarged testes; a juvenile, barely able to fly, was taken on
August 14. Two specimens were beginning to molt.
Specimens (9): [Female], 40932, ova to 1 mm., 20.8 gm. (July 21),
and [Male], 40933, testis 8 x 6 mm., 21.2 gm. (July 21), Piste;
[Female], 40930, ovary moderately active, 23.2 gm. (July 26), and
[Male], 40931, imm., 22.7 gm. (July 26), 3-1/2 km. N Piste; [Male],
40934, testis 6 x 4 mm., 24.5 gm., molting--1st and 2nd primaries
ensheathed (August 14), [Male], 40935, juv. (remiges and rectrices
ensheathed basally), 17.7 gm. (August 14), [Female], 40936, imm.,
25.0 gm (August 14), [Female], 40937, ovary granular, 22.6 gm.,
molting--2nd primaries ensheathed (August 15), and [Male], 40938,
testis 7 x 5 mm. (August 15), 4 km. NNE Felipe Carrillo Puerto.
_Arremonops chloronota chloronota_ (Salvin): Green-backed Sparrow.--
Evidence presented by Monroe (1963) indicates that _A. chloronota_ and
_A. conirostris_ are not conspecific. Specimens collected in breeding
condition in July seem to be the first breeding records of this species
on the peninsula.
Specimens (7): [Female], 40942, ova to 3 mm., 29.6 gm. (July 11), 5
km. S Champoton; [Male], 40944, testis 10 x 6 mm., 27.0 gm. (July
14), [Male], 40943, testis 5 x 3 mm., 23.1 gm. (July 14), and
[Male], 40945, testis 7 x 4 mm., 25.5 gm. (July 15), 5-{7-1/2} km.
W Escarcega; sex? 40939, 22.9 gm. (July 20), 6-1/2 km. W Piste;
[Male], 40940, imm., 21.5 gm. (August 4), 4 km. WSW Puerto Juarez;
[Female], 40941, 26.5 gm., extensive body molt, (August 15), 4 km.
NNE Felipe Carrillo Puerto.
TABLE 2. An Alphabetical List of Species of Mallophaga Removed from
Birds Collected on the Yucatan Peninsula in 1962.