178 - DIPTERA. 
Head of the male white, somewhat silvery, of the female yellowish-white; front behind a little narrower, in 
the female broader, than the eyes; frontal band black, nearly as broad as the lateral portions ; frontal 
bristles descending as far as the end of the second antennal joint; vibrisse inserted at a little distance 
above the oral margin; cheeks with some rufous reflection. Antenne black; second joint bristly ; third 
joint four or five times as long as the second; arista thickened to one third of its length. Proboscis 
black; palpi dark rufous. Thorax and scutellum black, covered with a bluish-grey, laterally with a 
white, tomentum ; the usual stripes almost inconspicuous. Abdomen conical; the second and following 
segments have white front borders, which on the dorsal portion are narrow, but laterally broader ; in the 
male the second segment has some rufous tint at the sides; discal and marginal macrochete are present. 
Legs black ; hind tibise outwardly with a row of bristles; foot-claws and pulvilli in both sexes short. 
Tegule whitish. Wings greyish-hyaline; small cross-vein a little before the middle of the discal cell ; 
curvature of the fourth vein with a blunt angle; apical and posterior cross-veins oblique, the apical 
nearly straight, the posterior slightly curved. 
Hab. Mexico, Cuernavaca in Morelos, Medellin in Vera Cruz (H. H. Smith). 
A male and two female specimens. 
20. Telothyria costalis, sp. n., 9. 
Black; head and front borders of the abdominal segments whitish ; thorax grey, anteriorly with four black 
stripes; palpi rufous; wings infuscated along the costa. 
Length 5 millim. 
Front broader than the eyes; frontal band black, as broad as the lateral portions, not fully reaching the 
vertex; frontal bristles descending as far as the end of the second antennal joint; vibrisse at a short 
distance above the oral margin ; occiput grey. Antenne black; third joint three or four times as long 
as the second; arista microscopically pubescent, thickened to the proximal half. Palpi slightly thickened 
towards the tip. Thorax and scutellum whitish-grey, anteriorly with four black stripes, the intermediate 
of which are linear; behind the transverse suture the stripes disappear in a more general black colour, 
which, however, is not extended to the hind margin. Abdomen oblong-ovate, shining black, with white 
reflections on the front borders of the second and third segments, and also, but less distinctly, on that of 
the anal segment; discal and marginal macrochete are present, but the discal ones are much shorter than 
the others. Legs black; middle and hind tibis with several bristles, some of them long and robust. 
Tegule whitish. Wings greyish-hyaline, yellowish-brown along the costa, which bears very short bristles 
and a distinct spine; small cross-vein distinctly before the middle of the discal cell; curvature of the 
fourth vein with a blunt angle; apical and posterior cross-veins straight. 
Hab. Mexico, Omilteme in Guerrero 8000 feet, Atoyac in Vera Cruz (H. H. Smith). 
A single female specimen from each locality. 
21. Telothyria rava, sp. n., °. 
Shining black; head yellowish-white ; thoracic stripes indistinct ; front borders of the abdominal segments 
greyish ; discal and marginal macrocheetz short. 
Length 6—6°5 millim. 
Front as broad as the eyes ; frontal band black, broader than the lateral portions ; frontal bristles descending 
as far as the end of the second antennal joint. Antenne black; second joint bristly; third joint three 
times as long as the second ; arista thickened in its proximal half. Proboscis black, its terminal lips with 
yellow hairs; palpi rufous, but sometimes very obscure. Thorax and scutellum shining black; thoracic 
dorsum anteriorly somewhat greyish, with indistinct black stripes. Abdomen ovate, shining black ; 
second and following segments with more or less distinct greyish front borders and vestiges of a black 
dorsal stripe; discal and marginal macrocheete present, but short. Legs black; middle tibie with some 
long bristles; hind tibie: outwardly with a row of short bristles and a longer bristle below the middle ; 
foot-claws and pulvilli short. Tegule brownish. Wings greyish-hyaline ; small cross-vein a little before 
the middle of the discal cell; apical cross-vein nearly straight ; posterior cross-vein more or less curved. 
