146 DIPTERA. 
10. Hypostena quadristriata, sp. n., ¢. (Tab. IV. figg. 5; 5a, head in 
profile.) | 
Shining black; sides of the front, thorax, scutellum (except its base), and front borders of the abdominal 
segments pale ochraceous; thoracic dorsum with four black stripes; antennz and legs black; palpi 
rufous. 
Length 7 millim. 
Front much narrower than the eyes; frontal band black, narrowed behind ; frontal bristles descending as far 
as the end of the second antennal joint; face perpendicular, yellowish-grey ; cheeks rather broad, the 
eyes not descending beneath the tip of the antennex ; occiput dark grey, along the hind borders of the 
eyes with yellow reflections. Antenne shorter than the face; second joint bristly; third joint three 
times as long as the second; arista thickened in its proximal third. Thorax with a pale ochraceous 
tomentum and four black stripes, which are very distinct before the transverse suture; scutellum with 
the base black, the apical half pale yellow. Abdomen subcylindrical, shining, black or blackish-brown ; 
the second and following segments with a pale yellow front border and long discal and marginal macro- 
cheetze. Legs rather long and slender; the bristles not very strong, those on the underside of the front 
femora the longest; foot-claws and pulvilli elongate and surrounded by bristly hairs. Tegule pale 
ochraceous. Wings greyish, the base and costa slightly infuscated ; third vein somewhat bent upwards 
near its end; curvature of the fourth vein with a blunt angle; small cross-vein a little before the middle 
of the discal cell ; apical cross-vein straight ; posterior cross-vein distinctly curved. 
Hab. Costa Rica, Volcan de Irazu 6000 feet (Rogers). 
One male specimen. 
11. Hypostena turbinata, sp. n., ¢. 
Grey ; face and sides of the front whitish ; frontal band, antennae, four stripes on the thorax, hind borders of 
the abdominal segments, and legs black ; palpi rufous. 
Length 5-5 millim. 
Front posteriorly narrower than the eyes; frontal band as broad as the lateral portions; frontal bristles 
descending a little beneath the end of the second antennal joint; cheeks rather broad, the eyes not 
descending beneath the tip of the antenne; vibrisse inserted nearly at the oral margin. Antenne 
shorter than the face; third joint three or four times as long as the second; arista thickened in its 
proximal half. The black stripes on the thorax distinct only before the transverse suture; scutellum 
black at the base. Abdomen flattened at the sides; first segment black; the following segments grey, 
with broad black hind borders, which occupy more than half the length of each segment; second 
segment at the sides of a somewhat yellowish-rufous colour ; long macrochete on the disc and on the 
hind margin of each segment. Hind tibie outwardly with a pair of bristles at the middle and a pair 
just before the apex; foot-claws and pulvilli elongate, the pulvilli yellowish. Tegule whitish. Wings 
greyish-hyaline ; small cross-vein on the middle of the discal cell; curvature of the fourth vein with a 
somewhat rounded angle; apical cross-vein nearly straight ; posterior cross-vein rather distinetly 
curved. 
Hab. Mexico, Medellin near Vera Cruz (H. H. Smith). 
A single male specimen. 
12. Hypostena strigosa, sp. n., ¢ 2. 
Light grey ; thorax with four black stripes; antenne rufous, blackish towards the tip ; abdomen rufous, 
with black hind borders to the segments and black discal points; legs rufous, the tarsi black ; palpi 
yellow ; wings brownish. 
Length 6°5-8 millim. 
Face and cheeks white ; front yellowish, in both sexes narrower than the eyes ; frontal band black, linear ; 
