102 DIPTERA. 
pilosity of the eyes only conspicuous under a lens; posterior orbits with a regular row of short black 
bristles. Antenne shorter than the face; basal joints rufous ; third joint blackish, three times as long as 
the second; arista thickened to less than the proximal half. Proboscis black, of the usual shape, with 
distinct terminal lips; palpi cylindrical, pale rufous. Thoracic dorsum anteriorly with four not very 
conspicuous black stripes, the median stripes linear. Abdomen conical; first segment black; the following 
segments shining black, with whitish front borders and with some stout macrochete near the hind mar- 
gins, Front tibie outwardly with short bristles; posterior tibiee with long bristles; tarsi attenuate 
towards the tip; foot-claws and pulvilli short. Tegule whitish. Wings greyish-hyaline; first and third 
veins with short bristles over their whole length; fifth vein with bristles only on the base ; small cross- 
vein on the middle of the discal cell; apical cross-vein concave at its base; posterior cross-vein curved, 
inserted beyond the middle between the small cross-vein and the curvation of the fourth vein: this curva- 
tion forms a rectangle, and behind it the vein is not continued. 
Hab. Muxico, Chilpancingo 4600 feet, Amula 6000 feet, both in Guerrero (H. H. 
Smith). 
Three female specimens. 
2. Plagia americana, sp.n., ¢ 2. (Tab. III. fig. 19, wing.) 
Black ; thorax with grey tomentum and four black stripes; abdomen with white reflections; palpi rufous 
towards the tip ; first and third veins with bristles. 
Length 7 millim. 
Face and cheeks white ; front cinereous, in both sexes broader than the eyes; frontal band black, but some- 
times disappearing in a greyish reflection ; frontal bristles long and stout, descending as far as the end of 
the second antennal joint ; eyes bare, Antenne black, the basal joints with whitish reflections; third 
joint a little longer than the second; arista thickened to beyond the middle. Proboscis black; palpi 
black at the base, the somewhat thickened tips rufous. Thorax, scutellum, and abdomen black, the thorax 
before the transverse suture with a whitish-grey tomentum and four black stripes; pleure greyish. 
Abdomen conical; front borders of the second and following segments with whitish reflections; the second 
and third segments without discal macrochete, but with rather strong marginal macrochete, the median 
two of the third segment at some distance before the hind margin. Legs black, thickly beset with 
bristles, those of the middle and hind tibise very long; foot-claws and pulvilli somewhat elongate in the 
male, those of the front legs still longer; the pulvilli pale yellow. Tegule whitish. Wings with a grey 
tint ; the first vein bristly over its whole length, the third to beyond the small cross-vein; fourth vein 
slightly prolonged at its curvation ; apical and posterior cross-veins nearly straight, the posterior more 
oblique than the apical. 
Hab. Mexico, Orizaba (H. H. Smith & F. D. G.), Venta de Zopilote 2800 feet, 
Xucumanatlan 7000 feet, and Omilteme 8000 feet, all in Guerrero, Teapa in Tabasco 
(H. H. Smith). 
Several specimens. 
This species is closely allied to the European P. ambigua, Fall. 
3. Plagia rigidirostris, sp. n., ¢. | 
Black ; thorax cinereous, with four black stripes; second and following segments with grey front borders; 
palpi and basal joints of the antenne rufous; proboscis slender, straight ; posterior cross-vein nearer to 
the small cross-vein than to the curvation of the fourth vein. 
Length 7°5-9°5 millim. 
Head white, with cinereous, on the lower part with rufous, reflections ; front broader than the eyes; frontal 
