94 DIPTERA. 
bristles ; posterior tibiee with some longer bristles ; foot-claws and pulvilli elongate in the male. Tegule 
grey, with a white margin. Wings greyish; small cross-vein a little before the middle of the discal cell ; 
apical and posterior cross-veins slightly.curved. 
Hab. Mexico, Xucumanatlan 7000 feet in Guerrero, Atoyac in Vera Cruz (H. H. 
Smith). 
A male and a female specimen. 
5. Brachycoma, ruficauda, sp. n., 2. 
Blackish-cinereous; head whitish ; thorax with four black lines; scutellum testaceous; abdomen with grey 
front borders to the segments ; anal segment and palpi rufous; antenne and legs black. 
Length 7°5 millim. 
Front cinereous, broader than the eyes ; frontal band dark brown, narrower than the whitish lateral portions ; 
frontal bristles on each side in a double row, descending as far as the end of the second antennal joint ; 
face and cheeks whitish ; vibrissee surmounted by some short hairs ; eyes descending beneath the vibriss#. 
Antenne much shorter than the face; second joint bristly ; third joint two or three times as long as the 
second; arista thickened to beyond the proximal half. Proboscis black; palpi pale rufous, curved upwards 
and thickened towards the tip. Thorax blackish, with a cinereous tomentum, which is most conspicuous 
before the transverse suture, and with four slender black stripes; pleure cinereous ; scutellum reddish- 
testaceous. Abdomen ovate; first segment black; second and third segments black, with more or less 
extended whitish or cinereous reflections on the front borders; a black dorsal stripe is always visible ; 
anal segment rufous, with a whitish front border ; a pair of strong macrochete on the hind margin of the 
second segment, a row of similar macrochete on that of the third segment; anal segment with many 
shorter macrocheete ; ventral surface brown, with whitish reflections. Front tibiz outwardly with short 
bristles ; middle tibiee with some long bristles; the bristles on the outer edge of the hind tibia nearly 
fringe-like; foot-claws and pulvilli short. Tegule whitish. Wings greyish-hyaline; small cross-vein 
before the middle of the discal cell; curvation of the fourth vein forming a rectangle; apical cross~vein 
concave ; posterior cross-vein oblique and curved. 
Hab. Mexico, Atoyac in Vera Cruz (H. H. Smith). 
Two female specimens. 
6. Brachycoma trifida, sp.n.,¢ ?. 
Grey ; frontal band, four stripes on the thorax, three stripes on the abdomen, antenne, palpi, and legs black ; 
anal segment rufous. 
Length 8:5-10 millim. 
Head of the male yellowish-white, of the female ochraceous; front as broad as the eyes, slightly narrowed 
behind, in the female broader; frontal bristles short and weak, on each side in a double row and descending 
to beneath the second antennal joint, the outer row less distinct in the female; eyes descending to the 
vibrissee. Antenne shorter than the face; second joint bristly; third joint three times as long as the 
second ; arista thickened to the proximal half ( ¢ ) or to a little beyond the middle( 2). Proboscis black ; 
palpi black, sometimes slightly rufous at the tip. Thorax with very conspicuous black stripes, the outer 
stripes continued behind the transverse suture ; scutellum cinereous, with a blackish reflecting spot on the 
disc, sometimes a little rufous at the hind margin. Abdomen ovate, light grey; the first three segments 
with a black hind margin and black reflecting spots, which appear in three rows; anal segment rufous, 
with ochraceous tomentum; macrochetz on the hind margin of the third segment and on the anal 
segment; sometimes a pair of short macrochete on the hind margin of the second segment. Legs with 
rather short bristles, those on the outer edge of the hind tibie somewhat fringe-like: foot-claws and 
pulvilli elongate in the male; the pulvilli yellow. Tegule white. Wings nearly hyaline; small cross- 
vein a little before the middle of the discal cell; apical and posterior cross-veins slightly concave. 
