DIPTERA. — 443 
6. Hyalomyia nigrens. 
Hyalomyia nigrens, v. d. Wulp, Tijdschr. voor Ent. xxxv. p. 185 1. 
Cinereous ; thoracic stripes, first abdominal segment, antenne, and legs black ; wings greyish. 
Length 5 millim. 
Head greyish-white ; front trigonal, narrowed behind in such a manner that the eyes are nearly coalescent ; 
face distinctly projecting towards the oral margin Antenne black; third joint one and a half times as 
long as the second. Proboscis black; palpi rufous, slightly thickened at the tip. Thorax qinereous; 
some broad black stripes are more or less distinct before the transverse suture, but disappear in the 
general black colour behind it; scutellum black. Abdomen black, and beset with short black hairs; 
the last three segments cinereous, with a black dorsal stripe, the hind margins also blackish. Legs 
black, the femora with faint metallic-blue reflections ; foot-claws and pulvilli short, the pulvilli brownish. 
Tegule yellowish-white ; halteres yellow. Wings greyish-hyaline ; small cross-vein before the end of 
the first vein and beyond the middle of the discal cell; posterior cross-vein in the middle between the 
small cross-vein and the arcuate curvature of the fourth vein. 
Hab. Mexico 1, Omilteme, Xucumanatlan, and Amula in Guerrero (H. H. Smith). 
Six females. These specimens may belong to H. punctigera, Towns. (Proc. Ent. 
Soc. Wash. ii. p. 135), from Virginia, which has the epistoma unusually prominent, 
the palpi much enlarged at the tip, and the femora rather stout. H. punctigera, 3, 
differs from all the Mexican Hyalomyie of which the males are known in having 
the front triangular and the eyes rather closely approximated towards the vertex. 
[Mr. Townsend (Canad. Ent. 1893, p. 166) states that the two species apparently 
differ very little. | 
7. Hyalomyia piceipes. 
Hyalomyia piceipes, v. d. Wulp, Tijdschr. voor Ent. xxxv. p. 186°. 
Black ; thorax cinereous, with four-black stripes; face and cheeks silvery-white ; wings hyaline. 
Length 6°5 millim. 
This species is very like H. nigrens, but it is somewhat larger; the eyes are a little more separated on the 
vertex, and the face is not at all prominent towards tbe oral margin. Face and cheeks white, with 
silvery reflections ; front and antenne black, the third antennal joint one and a half times as long as the 
* second ; proboscis black ; palpi rufous, slightly enlarged at the tip. Thorax obscure cinereous; thoracic 
dorsum with four equally broad black stripes, the interspaces on the front side whitish; scutellum black. 
Abdomen shining bluish-black, without cinereous tomentum on the last segments, laterally with white 
hairs. Legs black, the femora and tibie brownish; on the front pair the coxze with white hairs, the 
femora on the upperside with black, outward and beneath with white hairs ; foot-claws black, pulvilli 
brownish-yellow, scarcely longer than the last tarsal joint. Tegule greyish, with a white margin, 
Wings hyaline, without greyish tint; venation as in H. nigrens, except that the posterior cross-vein is a 
little before the middle between the small cross-vein and the curvature of the fourth vein. 
Hab. Mexico 1, Omilteme in Guerrero 8000 feet (H. H. Smith). 
Two specimens. ? ‘ Key j 
8. Hyalomyia merens. 
Hyalomyia merens, v. d. Wulp, Tijdschr. voor Ent. xxxv. p. 186°. 
Black; abdomen shining violet ; wings brown. 
Length 4 millim. 
