Gen. SERACA, n. g.
_Foem. Corpus_ longiusculum. _Caput_ transversum, thorace vix
angustius. Antennæ breves, articulo 3° conico, arista plumosa.
_Thorax_ ellipticus. _Abdomen_ ellipticum. _Pedes_ mediocres. _Alæ_
longiusculæ, latiusculæ.
_Female._ Body rather long. Head transverse, nearly as broad as the
thorax; epistoma not prominent. Antennæ short, not near reaching the
epistoma; 3rd joint conical, much longer than the 2nd; arista plumose.
Thorax and abdomen elliptical, about equal in length. Legs moderately
long and slender. Wings rather long and broad.
216. SERACA SIGNIFERA, n. s. _Foem._ Fulva, thorace vittis quatuor
metathorace vittis duabus abdomine maculis lateralibus nigris, alis
obscure fuscis albo quinquesignatis apud costam nigricantibus basi
flavis.
_Female._ Tawny, shining; head testaceous about the eyes; thorax with
four black stripes, the outer pair incomplete; metathorax with two
black stripes; abdomen with a row of black spots along each side;
wings dark brown, blackish along the costa, yellow at the base, with
five lanceolate white marks, two of these resting on the costa, the
third between them near the hind border, the fourth exterior, discal,
slender, oblique, the fifth on the hind border near the tip; veins
black, tawny at the base; discal transverse vein curved outward,
parted by about one-fourth of its length from the border, and by much
more than its length from the præbrachial transverse. Length of the
body 4 lines; of the wings 8 lines.
217. SERACA SIGNATA, n. s. _Foem._ Testacea, longiuscula, epistomate
guttis duabus nigris, arista plumosa, abdomine postice attenuato
maculis duabus lateralibus subapicalibus, alis cincrascentibus, costa
exteriore nigricante.
_Female._ Testaceous, shining, rather long; head nearly as broad as
the thorax, with a black dot on each side of the epistoma; antennæ
short, 3rd joint elongate-conical, arista plumose; thorax elliptical;
abdomen attenuated hindward, longer than the thorax, with a black spot
on each side of the 5th segment; wings greyish, blackish along the
apical half of the costa; veins testaceous, black towards the tips;
discal transverse vein nearly straight and upright, parted by about
one-fourth of its length from the border, and by hardly more than
its length from the præbrachial transverse. Length of the body 3-1/2
lines; of the wings 7 lines.
Gen. PSILA, _Meigen_.
218. PSILA BIPUNCTIFERA, n. s. _Foem._ Testacea, facie nigro
bipunctata, antennarum articulo 3° longiconico, arista pubescente,
abdomine guttis duabus apicalibus nigris, alis pallide cinereis flavo
suffusis.
_Female._ Testaceous; head somewhat pilose beneath, with a black point
on each side of the face; 3rd joint of the antennæ elongate-conical,
about twice the length of the 2nd; arista pubescent; thorax elongate,
somewhat flat above; abdomen fusiform, a little longer than the
thorax; 5th segment with a black dot on each side; wings pale
cinereous, tinged with yellow; veins yellow; discal transverse vein
straight, oblique, parted by hardly more than one-fourth of its length
from the border, and by more than its length from the præbrachial
transverse. Length of the body 5 lines; of the wings 10 lines.
219. PSILA MUNDA, n. s. _Mas et Foem._ Nigra, nitens, facie testacea
nigro notata, antennis testaceis basi nigris, arista plumosa, thorace
subcinerascente, scutello obscure testaceo, pedibus testaceis, alis
cinereis apud costam nigricantibus, halteribus albidis.
_Male and Female._ Black, shining; head testaceous, blackish above;
disk of the face black, shining; antennæ short, testaceous, black at
the base; 3rd joint linear, rounded at the tip, about twice the length
of the 2nd; arista plumose; thorax linear, with slight cinereous
tomentum; scutellum dull testaceous; abdomen fusiform, a little longer
than the thorax; legs testaceous; wings grey, blackish along the
costa towards the tips; veins black; discal transverse vein straight,
upright, parted by about half its length from the border, and by
nearly thrice its length from the præbrachial transverse; halteres
whitish. Length of the body 2-1/2-3 lines; of the wings 4-5 lines.