66 DIPTERA. 
rufous, the front side and the tip with a blackish margin; in the female these organs are of a more obscure 
colour, though the hind margin of the third joint is always somewhat rufous ; arista thickened almost to 
the middle. Proboscis black; palpi yellowish-rufous. Thorax, scutellum, and abdomen shining black ; 
thorax anteriorly with a greyish tomentum and obsolete black stripes ; abdomen conical, with grey and 
white reflecting spots, especially on the front margin of the second and following segments, and with = 
many long discal and marginal macrochete. Legs black, the tibie piceous; middle and hind tibie 
outwardly with long bristles ; foot-claws and pulvilli of the male elongate, the pulvilli whitish. Tegule 
white. Wings greyish-hyaline, in the female somewhat brownish ; small cross-vein thick, before the 
middle of the discal cell; apical cross-vein concave at its origin, for the rest straight; posterior cross-vein 
slightly curved. 
Hab. Mexico, Orizaba (H. H. Smith & F. D. G.), Omilteme in Guerrero 8000 feet 
One female and two male specimens. 
9. Exorista rubricornis, sp. n., 2. 
Grey ; antennex and palpi rufous; thorax with four black stripes; abdomen without discal macrochsete, black, 
except the anal segment, which is rufous, the front borders of the segments whitish ; legs black. 
Length 7-5 millim. | 
Front as broad as the diameter of the eyes ; frontal band black, narrower than the grey lateral portions ; frontal 
bristles descending to the number of three or four beneath the root of the antennee ; face and cheeks with 
silvery reflections; beard and pilosity of the occiput whitish; eyes with yellowish pile. Antenne rufous, 
nearly as long as the face ; second joint elongate, with black bristles on its upper part; third joint two or 
three times as long as the second, its front margin more or less infuscated; arista black, gradually tapering 
towards the end. The black stripes of the thoracic dorsum conspicuous over nearly its whole length ; 
scutellum with a slight rufous tint, which, however, is scarcely visible through the grey tomentum with 
which it is covered. Abdomen ovate, shining black ; the second and third segments with whitish front 
borders and laterally slightly rufous; anal segment rufous, with some white reflections on the front 
border ; ventral face brown, with a similar white reflection, which, however, is more defined and forms 
transverse bands attenuated on either side. Legs black, the underside of the femora whitish ; bristles not 
very strong; hind tibies outwardly fringed with short bristles. Tegule white. Wings greyish ; small 
cross-vein oblique, on the middle of the discal cell; apical and posterior cross-veins curved. . 
Hub. Muxtco, Atoyac in Vera Cruz (H. H. Smith), Temax in North Yucatan 
(Gaumer). | 
Two female specimens. 
10. Exorista latevittata, sp. n., ¢. | 
Thorax grey, with four broad black stripes, two and two united behind the transverse suture ; abdomen black, 
laterally reddish, with the front margins of the segments white; anus more or less rufous; hind tibie 
outwardly fringed ; palpi black. 
Length 9°5 millim. 
Head whitish-grey; front narrower than the diameter of the eyes; frontal band black; frontal bristles 
descending on both sides in a single row beneath the second antennal joint; vibrissze surmounted by some 
shorter bristles; beard and pilosity of the occiput whitish; eyes densely beset with a yellowish pile. 
Antenne black, shorter than the face; second joint bristly on the upper part; third joint three or four 
times as long as the second, sometimes slightly rufous at the extreme base; arista thickened on the 
proximal half. The stripes on the thoracic dorsum as broad as the interspaces; scutellum black, brownish 
towards the hind margin. Abdomen broadly ovate, black, the sides of the second and third segments 
reddish-yellow, the latter with a narrow, white front margin; anus in one of the specimens slightly, in 
