92 DIPTERA. 
17. Arista thickened to beyond the middle. . . . . .. . 18 
Arista thickened only to the proximal half . . . . . . 19. 
18. Scutellum testaceous . . . 2. . 1. . 1. ee ee) dongicornis, v. d. Wulp. 
Scutellum concolorous with the thorax . . . . . . .  Striatella, v.d. Wulp. 
19. Anal segment unicolorous grey or slightly ochraceous . . cineracea, v. d. Wulp. 
Anal segment grey, posteriorly shining black . . . . . spuria, v.d. Wulp. 
1. Brachycoma laticeps, sp. n.,¢ ¢. 
Cinereous ; head ochraceous, broader than the thorax ; front broad, with a blackish stripe on each side of the 
frontal band ; thoracic stripes, antenn, palpi, and legs black; abdomen with blackish reflections ; anal 
segment fulvous or ochraceous. 
Length 11 millim. . 
Head bright ochraceous; antennal grooves greyish-black; front with black hairs—in the male strongly 
narrowed behind, in the female much broader than the eyes; frontal band black, narrow, and between 
it and the orbits of the eyes a blackish stripe, which in the female is beset with a row of bristles; the 
usual frontal bristles descending on each side in a curved row as far as the end of the first antennal joint ; 
eyes descending to the vibrisse ; beard whitish. Antenna much shorter than the face; second joint 
elongate, with some bristles ; third joint as long as the second ; arista thickened to the proximal half. 
Proboscis black; palpi rufous (¢) or black (2). Thorax cinereous, with four black stripes—the outer ~ 
stripes extending over the whole length, the intermediate ones to a little beyond the transverse suture ; 
a fifth blackish stripe in the middle, extending from the hind margin to near the suture; pleure partly 
grey or ochraceous; scutellum cinereous, with a blackish reflecting spot. Abdomen broadly ovate, 
convex, cinereous, with blackish reflecting spots and a black dorsal stripe; the intermediate segments 
laterally somewhat testaceous ; anal segment bright fulvous or ochraceous; macrochextz rather short, - 
only on the hind margins of the last two segments. Front tibia outwardly with a double row of bristles ; 
middle tibiz with some longer bristles ; hind tibiee outwardly fringed with short bristles from the base to 
beyond the middle, where a longer bristle appears ; foot-claws and pulvilli of the male a little longer than 
in the female. Tegule whitish. Wings greyish-hyaline; small cross-vein oblique, a little before the 
middle of the discal cell ; apical cross-vein nearly straight ; posterior cross-vein slightly curved. 
Hab. Mexico, Rio Papagaio 1200 feet and Rincon 2800 feet, both in Guerrero, Teapa 
in Tabasco (H. H. Smith). 
A male and some female specimens. 
2. Brachycoma afra, sp. n., 3 (¢ 2). 
Shining black ; head whitish ; abdomen with grey reflections; antenne, palpi, and legs black. 
Length 7:5 millim. 
3g. Head white, with brownish-grey reflections ; front narrower than the eyes; frontal band black; frontal 
bristles on each side in a single row ; vibrissz surmounted by some shorter bristles; eyes descending to 
the vibrisse. Antenne: shorter than the face ; second joint bristly ; third joint four times as long as the 
second ; arista thickened to the proximal half; palpi black, somewhat dark rufous at the tip. Thoracic 
dorsum before the transverse suture with some grey tomentum and five black lines, which, however, are 
not always conspicuous ; scutellum with grey reflections. Abdomen broadly ovate; the grey reflections 
appear on the front borders of the second and following segments ; a black dorsal stripe is usually visible ; 
the second segment is slightly testaceous at the sides ; macrochete are only on the hind margins of the 
last two segments. Middle tibia with some long bristles; hind tibiae outwardly nearly fringed ; foot- 
claws and pulvilli elongate, the pulvilli yellowish. Tegule greyish-yellow. Wings greyish-hyaline, on 
the base up to the humeral cross-vein anteriorly with bristles; small cross-vein a little before the middle 
of the costal cell; apical cross-vein slightly concave ; posterior cross-vein somewhat sinuate. 
Hab. Mexico, Teapa in Tabasco (Hl. H. Smith). 
