200 DIPTERA. 
29. Anisia niveomarginata, sp. n., ?. 
Black; head white; thorax laterally grey; abdomen with narrow snow-white front borders to the segments. 
Length 3°5 millim. 
Front white, broader than the eyes, with parallel sides; frontal band black, nearly as broad as the lateral 
portions; frontal bristles descending scarcely beneath the root of the antennsz; face and cheeks white. 
Antenne black, shorter than the face; third joint three times as long as the second; arista somewhat 
pubescent, thickened to near the middle. Palpi rufous. Disc of the thorax black, the sides and the 
pleure whitish-grey ; scutellum blackish. Abdomen obconical, shining black; second and following 
segments with narrow, sharply limited, snow-white front borders, and with long marginal macrochete. 
Legs black; middle tibie with some long bristles ; hind tibie outwardly with bristles of unequal length. 
Tegule whitish. Wings hyaline; small cross-vein before the middle of the discal cell; apical cross-vein 
slightly concave ; posterior cross-vein nearly straight. 
Hab. Mexico, Amula in Guerrero 6000 feet (H. H. Smith). 
A single female specimen. 
30. Anisia umbrina, sp. n., °. 
Shining black ; head whitish ; thorax anteriorly light grey, with four black stripes; abdominal segments with 
whitish front borders ; palpi yellowish; wings brownish. 
Length 4 millim. 
Front broader than the eyes; frontal band brownish-black, as broad as the lateral portions; frontal bristles 
descending a little beneath the root of the antenne; cheeks beneath the eyes with a reddish-brown 
reflection. Antenne black, nearly as long as the face; third joint four or five times as long as the 
second ; arista microscopically pubescent, thickened to nearly half its length. Proboscis black, with the 
terminal lips rufous; palpi small, yellowish. Thorax black, with a whitish-grey tomentum and four 
black stripes, which are conspicuous only before the transverse suture; scutellum blackish. Abdomen 
ovate, pointed towards the anus, shining black, with whitish front borders to the second and following 
segments ; macrochete only at the hind margins of the segments, those on the second and third segments 
longer than the others ; ventral surface unicolorous black. Legs black, with scattered bristles ; foot-claws 
and pulvilli short. Tegule whitish. Wings brownish, more intensely so on the apical half; small cross- 
vein on the middle of the discal cell; curvature of the fourth vein rounded; apical cross-vein oblique, 
slightly concave ; posterior cross-vein perpendicular, nearly straight. 
Hab. Mexico, Teapa in Tabasco (4. H. Smith). 
A single female specimen. 
31. Anisia opaca, sp. n., 2. 
Thorax cinereous ; frontal band, four thoracic stripes, antennz, palpi, and legs black ; abdomen shining black, 
with narrow whitish front borders to the segments; wings brownish. 
Length 5 millim. 
Front cinereous, a little broader than the eyes; frontal band as broad as the lateral portions; frontal bristles 
descending to beneath the second antennal joint; face and cheeks yellowish-white. Antenne shorter 
than the face; second joint bristly ; third joint four times as long as the second; arista thickened to near 
the middle. Proboscis and palpi black, the palpi slightly thicker towards the tip. Thorax cinereous, 
with four distinct black stripes, the outer stripes interrupted at the transverse suture; scutellum black. 
Abdomen ovate, flattened, pointed towards the anus, shining black ; second and following segments with 
narrow yellowish-white front borders; all the segments with rather long marginal macrochete. Middle 
tibie with some long bristles; hind tibie outwardly with several bristles of unequal length. Tegule 
yellowish. Wings brownish, especially at the base and costa and along the veins ; small cross-vein on, or 
a little before, the middle of the discal cell; apical cross-vein straight to near its end, where it is a little 
concave ; posterior cross-vein slightly curved, in some specimens nearly straight. 
