120 DIPTERA. 
6. Prospherysa contigua, sp. n., 2. 
Blackish ; thorax anteriorly grey with four black stripes; abdomen with grey reflections ; anus shining black ; 
frontal band, antennz, and legs black ; hind tibie outwardly almost fringe-like with bristles, 
Length 8 millim. 
Front cinereous, as broad as the eyes; frontal band as broad as the lateral portions ; frontal bristles descending 
on each side in a curved row to beneath the end of the second antennal joint; face whitish-grey, laterally 
with a brown reflection ; the bristles of the facial ridges mounting up more than half the face. Antenne 
‘ reaching to near the vibrisse; second joint bristly ; third joint four times as long as the second ; arista 
thickened nearly to the proximal half. Proboscis black; palpi dark rufous. Thorax and scutellum 
blackish, with some grey tomentum, which is most conspicuous before the transverse suture, and there 
interrupted by four rather narrow black stripes. Abdomen elongate-oval; first segment black, scarcely 
shorter than the following segments, which are blackish, with whitish-grey reflections on the front 
borders; the hind margin of the third segment and the anus are shining black; a pair of short macro- 
cheetz on the hind margin of the first segment; a similar pair of macrochetz on the disc, and another 
pair on the hind margin of the second segment; a row of longer macrochete on the hind margin of the 
third and several macrocheetee on the anal segment ; ventral surface black. Femora with several bristles on 
the underside; front tibie outwardly with short bristles; middle tibie with some longer bristles; the 
hind tibie outwardly almost fringe-like with bristles, and with a longer bristle below the middle; 
foot-claws and pulvilli short. Tegule whitish. Wings nearly hyaline, slightly yellowish at the base, 
without costal spine; small cross-vein almost on the middle of the discal cell; curvation of the fourth 
vein with a blunt angle; apical cross-vein oblique and straight; posterior cross-vein distinctly curved. 
Hab. Mexico, Cuernavaca (H. H. Smith). 
A single female specimen. 
7. Prospherysa crebra, sp. n., ¢ 2. 
Cinereous ; frontal band, four thoracic stripes, reflecting spots on the abdomen, antenne (except the rufous 
basal joints in the female), and legs black ; palpi rufous; cheeks with a row of bristles; posterior tibiz 
dark rufous. 
Length 9 millim. 
Front prominent, yellowish, with cinereous reflections, in both sexes broader than the eyes; frontal band 
narrower than the lateral portions ; frontal bristles on each side in a double row; face and cheeks yellowish, 
more or less silvery, the face perpendicular, the cheeks with a row of stout bristles (forming the continua- 
tion of the frontal bristles) close to the orbits of the eyes. Antenne of the male long and reaching the 
vibrisse, of the female shorter ; basal joints short, in the female rufous; second joint bristly ; third joint 
four (2) or six (3) times as long as the second; arista thickened to beyond the middle, the penultimate 
joint somewhat distinct and elongate. Proboscis black; palpi cylindrical, pale rufous. Thorax grey, 
with four distinct, equal, black stripes ; scutellum testaceous, but usually covered by a cinereous tomentum. 
Abdomen ovate (in the male more elongate), cinereous, with a yellowish tint, which becomes more intense 
towards the anus, the anal segment sometimes ochraceous ; the first three segments have irregular blackish 
reflecting spots, amongst which a somewhat interrupted black dorsal stripe appears; the first two segments 
have a pair, and the third and anal segments a complete row, of marginal macrochete ; ventral surface 
blackish ; male genitals prominent, in the form of a nipple, which is curved towards the venter. Legs 
black; tibiee, especially of the intermediate and hind pairs, dark rufous; front tibie outwardly with a 
row of short bristles; middle tibia with some long-and stout bristles ; hind tibie with bristles of unequal 
length ; foot-claws and pulvilli elongate in the male, the pulvilli yellowish. Tegule white. Wings 
greyish-hyaline; small cross-vein on the middle of the discal cell; apical cross-vein concave at the base ; 
posterior cross-vein slightly curved. 
Hab. Mexico, Amula 6000 feet, Xucumanatlan 7000 feet, and Omilteme 8000 feet, 
all in Guerrero (H. H. Smith). 
Many specimens. 
