CQNOSIA. 345 
on the anal segment. Legs slender, yellowish-rufous, the tarsi blackish, the hind femora infuscate at the 
tip; hind tibiz with three long bristles posteriorly ; foot-claws and pulvilli short in both sexes. Tegule 
whitish ; halteres yellow. Wings greyish-hyaline; neuration as in the preceding species. 
Hab. Mexico, Omilteme 8000 feet and Sierra de las Aguas Escondidas 9500 feet, 
both in Guerrero (H. H. Smith). 
Three male and five female specimens. 
5. Conosia femoralis, sp.n., ¢ 2. 
Cinereous; the stripes on the thorax and the large spots on the abdomen blackish ; antenne and palpi black ; 
legs rufous, the front femora and tarsi black. 
Length 3—4 millim. 
Front nearly as broad as the eyes, laterally whitish; frontal band deep black, bifid behind ; face and cheeks 
white, the cheeks narrow, their inferior part under the eyes linear. Antenne black, inserted above the 
median line of the eyes ; second joint with a bristle ; third joint one and a half times as long as the second, 
reaching to half the length of the face; arista long, microscopically pubescent. Proboscis and palpi 
black. Thorax, scutellum, and abdomen cinereous ; thoracic dorsum with four more or less distinct brown 
stripes, which posteriorly are united in pairs. Abdomen of the male cylindrical, somewhat hairy, each 
segment with a large spot, which occupies nearly the whole hind border; that of the female elliptical, 
pointed towards the tip, more generally obscure, the black markings less conspicuous. Legs rufous, with 
black tarsi, the front femora black to near the tip, the middle and hind femora sometimes more or less 
infuscate ; tibiae with some long bristles ; foot-claws and pulvilli short in both sexes. Tegule whitish ; 
halteres yellow. Wings greyish-hyaline; neuration as in the preceding species. 
Hab. Mexico, Orizaba (7. D. Godman & H. IT. Smitn), Chilpancingo in Guerrero 
4600 feet, Mexico city and Vera Cruz (7. H. Smith). 
One male and six female specimens. 
6. Conosia bistriata, sp.n., ¢ 2. 
Cinereous ; two bands on the thorax, hind borders of the abdominal segments, antenne, palpi, and legs black, 
the base of the femora rufous. 
Length 4°5 millim. 
Front as broad as the eyes, cinereous ; face and cheeks whitish, the cheeks narrow, their inferior part linear. 
Antenne black, inserted much above the median line of the eyes; second joint white at the tip; third 
joint three times as long as the second; arista pubescent. Proboscis and palpi black. Thorax and 
scutellum cinereous ; thoracic dorsum with two broad blackish bands, which are continued in lateral spots 
on the scutellum. Abdomen elliptical, pointed towards the tip, cinereous; all the segments with a 
blackish hind border, occupying half their length, and with a less distinct dorsal stripe; in some 
specimens the black markings are still more extended and the cinereous ground-colour is only visible 
laterally on the front borders of the segments. Legs black, the front knees and the base of the middle 
and hind femora rufous; hind tibiz with two long bristles posteriorly ; foot-claws and pulvilli rather 
elongate in the male, the pulvilli whitish. Tegule and halteres pale yellow. Wings greyish-hyaline 
neuration as in the preceding species. 
Hab. Mexico, Orizaba (H. H. Smith & F. D. Godman), Teapa in Tabasco 
(H. H. Smith). 
One male and four female specimens. They vary in the colour of the legs: one 
of the specimens has them black, without any rufous parts; and another has the 
BIOL. CENTR.-AMER., Dipt., Vol. II., September 1897. 2y 
