174. PLATYSTOMA ATOMARIUM, n. s. _Mas._ Cinereum, nigro pulverosum,
facie alba nigro biguttata, antennis pedibusque nigris, arista
plumosa, pectore albido, alis nigricantibus guttis plurimis limpidis.
_Male._ Cinereous; head flat above, white about the eyes; face white,
with a black dot on each side in front; antennæ black, nearly extending
to the peristoma; 3rd joint linear, rounded at the tip, more than twice
the length of the 2nd; arista plumose; thorax with numerous lines of
minute black points; pectus whitish, with black points; abdomen oval,
powdered with black, not longer than the thorax; legs short, stout,
black; wings blackish, covered with limpid dots, excepting a narrow
oblique band on the transverse veins; veins black; discal transverse
vein straight, upright, parted by less than half its length from the
border, and by a little more than half its length from the præbrachial
transverse. Length of the body 2-1/2 lines; of the wings 4-1/2 lines.
175. PLATYSTOMA BASALE, n. s. _Foem._ Cinerea, capite lineis tribus
albidis, antennis basi nigris, arista plumosa, thorace vittis
indistinctis fuscis maculisque lateralibus nigris testaceo-marginatis,
scutello nigro vitta cinerea, abdominis segmentis albido-marginatis,
femoribus anticis tibiisque albido fasciatis, alis subcinereis
lituris transversis fascia exteriore costam versus dilatata fasciaque
subapicali nigricantibus, halteribus albis.
_Female._ Cinereous; head white about the eyes and beneath, and with
three whitish lines on the front; epistoma not prominent; proboscis
large; antennæ black towards the base, not near reaching the epistoma;
3rd joint elongate-conical, about twice the length of the 2nd; arista
plumose; thorax with indistinct brown stripes, and on each side with
black shining testaceous-bordered spots; scutellum black, shining,
with a cinereous stripe; abdomen cinereous-black, oval, tawny on each
side at the base, a little shorter and narrower than the thorax; hind
borders of the segments whitish; legs black; tibiæ and fore femora with
a whitish band on each; wings slightly greyish, with several irregular
transverse blackish marks near the base, with a broad exterior blackish
band, which is dilated and contains a whitish streak towards the costa,
and with an irregular subapical blackish band; veins black; discal
transverse vein nearly straight and upright, parted by more than half
its length from the border, and by nearly twice its length from the
præbrachial transverse; halteres white. Length of the body 2-1/2 lines;
of the wings 4-1/2 lines.