96 
DIPTERA. 
short and weak, on each side in a single row, and descending to the number of three beneath the root. 
of the antenne. Eyes descending beneath the vibrisse ; oral margin strongly elevated in the middle ; 
beard pale yellow. Antenne pale rufous, short, not reaching lower than half the face ; third joint twice 
as long as the second; arista black, slightly thickened at the base. Proboscis black, the base and the 
terminal lips rufous; palpi rufous. Thorax pale cinereous, with four blackish lines, a whitish rough 
pile, and black bristles ; scutellum ochraceous. Abdomen conical, yellow, transparent ; a large black spot 
on the middle of the first segment and a black dorsal band on the following two segments, the band on the 
third segment laterally extended along the hind border; anal segment brownish-rufous ; all the segments 
have a narrow whitish front margin, interrupting the dorsal band; macrochete are only on the hind 
margins of the third and anal segments, a lateral one on that of the second. Legs rufous, with scattered 
bristles ; coxze cinereous, with yellowish pile; the tips of the hind femora and tibia brown ; all the tarsi 
black ; foot-claws and pulvilli very short. Tegule large, pale yellow. Wings hyaline ; small cross-vein 
on the middle of the discal cell ; apical cruss-vein slightly concave ; posterior cross-vein nearly straight. 
Hab. Mexico, Temax in North Yucatan (Gaumer). 
A single female specimen. 
This species differs from ail the others of the genus by its slender form and peculiar 
coloration. 
10. Brachycoma sublucens, sp. n., ¢. 
Cinereous; frontal band, antenne (except the basal joints, which are rufous), four thoracic stripes, and legs 
black ; abdomen grey, with brown reflections, laterally yellowish, somewhat transparent ; palpi rufous, 
very slender. 
Length 7 millim, 
Head whitish, with grey reflections; front narrowed behind, on the vertex nearly half as broad as the eyes ; 
frontal band brownish-black, broader than the whitish lateral portions ; a white point before the root of - 
the antenne ; frontal bristles descending on each side in a single row as far as the end of the second 
antennal joint; vibrissee accompanied by some other bristles; eyes descending beneath the vibrisse ; 
beard whitish. Antenne reaching to half the face; basal joints dark rufous; third joint black, twice as 
long as the second; arista thickened at the base. Proboscis black; palpi pale rufous, very slender, with 
black hairs. Thorax and scutellum cinereous; thoracic dorsum with four black stripes. Abdomen ovate, 
convex, grey, with brown reflecting spots, the spots forming dark hind borders to the segments and an 
interrupted dorsal stripe; the sides yellowish, slightly transparent ; macrochete on the hind margins of 
the second and following segments. Posterior tibie with scattered bristles ; foot-claws and pulvilli elon- 
gate, the pulvilli greyish. Tegule greyish. Wings nearly hyaline; small cross-vein on or a little before 
the middle of the discal cell; curvation of the fourth vein with a blunt angle; apical cross-vein oblique 
and a little concave ; posterior cross-vein less oblique, slightly curved, and nearly in the middle between 
the small cross-vein and the curvation of the fourth vein. 
Hab. Mextco, near the city (H. H. Smith). 
A single male specimen. 
11. Brachycoma subtilipalpis, sp.n., ¢ @. 
Cinereous ; face white or yellowish; abdomen testaceous or cinereous; basal joints of the antenne rufous ; 
frontal band, third antennal joint, four thoracic stripes, and legs black; palpi yellowish, very slender ; 
frontal bristles on each side in a single row. 
Length 7:5-10 millim. 
Front yellowish-cinereous, in the male narrowed behind and there scarcely as broad as the eyes, in the female 
a little broader ; frontal band narrower than the pale lateral portions ; frontal bristles descending on each 
_ side in a single row as far as the end of the second antennal joint; vibrissee accompanied by several 
