444 SUPPLEMENT. 
Front black, triangular, scarcely separating the eyes on the vertex; face and cheeks whitish, the face 
distinctly prominent towards the oral margin; beard white. Antenne black; second and third joints 
of nearly equal length ; palpi very small, rufous, the tip obscure. Thorax and scutellum black ; thoracic 
dorsum before the transverse suture greyish, with indistinct black stripes. Abdomen shining metallic- 
violet ; in one of the specimens with a sparse cinereous tomentum, which does not hide the ground- 
colour, in the other this tomentum is entirely absent on the first segments’; the last segments are curved 
towards the venter; laterally, the abdomen is beset with black hairs. Legs black; foot-claws and 
pulvilli short, the pulvilli yellowish. Tegule brownish-grey. Wings unicolorous brown; small cross- 
vein under the middle of the mediastinal cell and nearly on 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!, Omilteme in Guerrero 8000 feet (H. H. Smith). 
Two specimens. [According to Mr. Townsend (Canad. Ent. 1893, p. 166), this 
species must be very near H. purpurascens, Towns.; the wings, however, of the latter 
are not brown, but whitish. This difference sufficiently indicates that the two species 
are distinct. | 
9. Hyalomyia umbrosa. (Tab. XIII. figg. 10, ¢; 10a, head.) 
Hyalomyia umbrosa, v. d. Wulp, Tijdschr. voor Ent. xxxv. p. 186°. 
Black ; head whitish ; abdomen shining violet ; veins of the wings bordered with brown. 
Length 6 millim. 
Front trigonal, scarcely separating the eyes on the vertex; face nearly perpendicular, slightly prominent 
towards the oral margin; face, cheeks, and sides of the front whitish ; immediately above the root of the 
antennz a small, semilunar, shining black spot; beard white. Antenne black; third joint one and a 
half times as long as the second. Proboscis black; palpi small, rufous, the tip brownish and slightly 
enlarged. Thorax black; shoulders and thoracic dorsum before the transverse suture greyish with black 
stripes. Abdomen shining metallic-violet ; the last segment with traces of grey tomentum; the abdomen 
beset with black hairs, especially at the sides. Legs black; foot-claws and pulvilli a little longer than 
the terminal joint of the tarsi; the pulvilli yellowish. Tegule whitish-grey. Wings grey, the veins 
broadly bordered with brown ; small cross-vein 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 !, Omilteme in Guerrero 8000 feet (H. H. Smith). 
A single specimen. 
10. Hyalomyia umbrifera. 
Hyalomyia umbrifera, v. d. Wulp, Tijdschr. voor Ent. xxxv. p. 1861. 
Black ; head whitish ; abdomen (except the first segment) cinereous ; wings partly brownish. 
Length 5°5 millim, 
In the shape and colouring of the head, antenne, palpi, and thorax agreeing with the preceding species 
(H. umbrosa). Abdomen shining black, with faint metallic-violet reflections ; the second and following 
segments with cinereous tomentum, leaving black hind-borders and a black dorsal stripe. Legs black ; 
foot-claws and pulvilli somewhat elongate, the pulvilli blackish, clearer at the tip. Tegule whitish. 
Wings greyish-hyaline ; the mediastinal cell brown and surrounded by a brownish tint, which is more or 
less prolonged at the costa and covers the small cross-vein ; in some specimens the tip is also brownish ; 
small cross-vein on the middle of the discal cell; posterior cross-vein in or a little beyond the middle 
between the small cross-vein and the arcuate curvature of the fourth vein. 
