Gen. DEXIA, _Meigen_.
114. DEXIA BASIFERA, n. s. _Foem._ Testaceo-alba, capitis antici
lateribus palpisque fulvis, oculis nudis, antennis pallide luteis,
thorace vittis quatuor nigris, abdomine fulvo fusiformi maculis
trigonis nigris, macula fasciaque testaceis, pedibus nigris longis,
femoribus fulvis apice nigris, tibiis ex parte fulvescentibus, alis
cinereis apud venas nigricantibus, fascia basali obliqua alba, alulis
albis.
Group of _D. longipes_.
_Female._ Testaceous white, narrow, bristly; head somewhat prominent;
frontalia black, slightly widening towards the epistoma, with
a few long stout black bristles on each side; facialia without
bristles; epistoma not prominent; sides of the peristoma tawny and
slightly produced; eyes bare; proboscis and palpi tawny, the former
geniculated, rather long; antennæ pale luteous, 3rd joint lanceolate,
not reaching the epistoma, thrice the length of the second; arista
plumose; thorax with two slender deep black stripes and with two
exterior broad blackish stripes; scutellum with six black spines;
abdomen tawny, fusiform, longer than the thorax, with little black
hairs, with several black spines, and with a triangular black spot
on the hind border of each segment; 3rd segment with a testaceous
spot at the base, 4th with a testaceous basal band; legs long,
black; femora tawny, with black tips; tibiæ partly dark tawny; wings
cinereous, blackish along the veins, with an oblique white basal band;
costa black at the base; veins black, testaceous in the white part;
præbrachial vein forming a slightly acute angle and emitting a short
stump at its flexure, curved inward from thence to its tip; discal
transverse vein undulating, parted by hardly more than half its length
from the border, and by less than its length from the flexure of the
præbrachial; alulæ white. Length of the body 5 lines; of the wings 10
lines.
_Mas._ Subaurato-cinerea, abdomine testaceo lanceolato longissimo
fasciis maculisque trigonis nigris connexis, pedibus anticis
longissimis, alis apud costam nigricantibus, venis vis nigricante
marginatis.
_Male._ Pale gilded cinereous, narrow, bristly; frontalia piceous,
widening much towards the epistoma, with bristles along each side;
sides of the peristoma much produced; thorax with four deep black
stripes, the outer pair rather broad; abdomen testaceous, lanceolate,
twice the length of the thorax; hind border of each segment with a
black band which is connected with a triangular black spot; legs very
long, fore legs extremely long; wings blackish along the costa, hardly
blackish along the veins; præbrachial vein curved slightly inward near
its flexure, almost straight from thence to its tip. Length of the
body 8 lines; of the wings 12 lines.
115. DEXIA INCLUDENS, n. s. _Foem._ Atra, capite apud oculos albo,
palpis antennis pedibusque nigris, thorace vittis duabus cinereis,
abdomine lanceolato fasciis tribus albis late interruptis, pedibus
longiusculis, alis nigricanti-cinereis, halteribus testaceis.
_Female._ Deep black; head cinereous in front, white about the eyes;
vertex narrow; frontalia widening to the face, with bristles along
each side; facialia without bristles; epistoma not prominent; palpi
slender; antennæ reaching the epistoma, 3rd joint narrow, linear,
about four times the length of the 2nd; thorax cinereous on each side,
and with two cinereous stripes; abdomen lanceolate, setose, nearly
twice the length of the thorax, with three widely interrupted white
bands; legs rather long; wings blackish grey; veins black; præbrachial
vein forming a very obtuse and slightly rounded angle at its flexure,
almost straight from thence to its tip; discal transverse vein almost
straight, parted by hardly less than its length from the border, and
by much more than its length from the flexure of the præbrachial;
alulæ whitish; halteres testaceous. Length of the body 3-1/2 lines;
of the wings 6 lines.
116. DEXIA PRECEDENS, n. s. _Foem._ Cinerea, capite albo lateribus
anticis piceis, palpis pedibusque nigris, antennis testaceis, thorace
vittis tribus nigris, abdomine basi lateribus fasciaque nigris,
punctis lateralibus albis, pedibus longiusculis, alis cinereis, alulis
albis.
_Female._ Cinereous; head white, piceous on each side in front;
frontalia deep black, slightly widening to the face, with bristles
along each side; facialia without bristles; epistoma not prominent;
palpi and legs black; antennæ testaceous, not reaching the epistoma,
3rd joint not thrice the length of the 2nd; thorax with three black
stripes, the lateral pair abbreviated hindward; abdomen a little
longer than the thorax, black and with white points along each side,
black at the base and with a black band on the hind border of the 2nd
segment; legs rather long; wings cinereous; veins black; præbrachial
vein forming a rounded and very obtuse angle at its flexure, almost
straight from thence to its tip; discal transverse vein nearly
straight, parted by less than its length from the border, and by very
much more than its length from the flexure of the præbrachial; alulæ
white; halteres piceous. Length of the body 2-1/2 lines; of the wings
4 lines.
Gen. TOROCCA, n. g.
_Foem. Corpus_ gracile, sublineare. _Proboscis_ palpique brevissimi.
_Antennæ_ brevissimæ, arista nuda. _Thorax_ brevis. _Abdomen_
longissimum, thorace plus duplo longius. _Pedes_ longissimi. _Alæ_
angustæ.
_Female._ Body slender, nearly linear. Head as broad as the thorax.
Proboscis and palpi very short. Antennæ very short, not nearly
extending to the epistoma; 3rd joint linear, rounded at the tip, about
twice the length of the 2nd; arista bare, stout towards the base,
full twice the length of the 3rd joint. Thorax short. Abdomen very
elongate-fusiform, more than twice the length of the thorax. Legs very
long. Wings narrow.
117. TOROCCA ABDOMINALIS, n. s. _Foem._ Viridis, capite pectoreque
albis, proboscide palpisque fulvis, antennis pedibusque nigris,
abdomine fulvo segmentorum marginibus posticis vittaque dorsali
nigris, alis nigricanti-cinereis, alulis albido-cinereis.
_Female._ Green, bristly; head and pectus white; frontalia deep black,
widening to the face, with a row of bristles along each side; facialia
without bristles; epistoma not prominent; eyes bare; proboscis and
palpi tawny; antennæ black: abdomen tawny, with a few spines; hind
borders of the segments black; 1st segment black at the base, and with
a broad black stripe: legs black; wings blackish cinereous; veins
black; præbrachial vein forming an almost right angle, and emitting a
short stump at its flexure, nearly straight from thence to its tip;
discal transverse vein very undulating, parted by about half its
length from the border, and by much less than its length from the
flexure of the præbrachial; alulæ whitish cinereous. Length of the
body 5-1/2 lines; of the wings 8 lines.