RHYNCHODEXIA. 235 
Front prominent, flattened, narrowed behind; frontal band brownish-rufous, with grey reflections; face 
yellowish-white, with brown reflections; vibrissal swellings parallel. Antenns short; the two basal 
joints and the base of the third rufous, the latter for the rest black; second joint with short bristles ; 
third joint twice as long as the second ; arista black, short-plumose, thickened at the base. Proboscis a 
little longer than the head, black; palpi slender, pale rufous. Thoracic dorsum with four indistinct black 
stripes; scutellum blackish. Abdomen conical, blackish, with irregular whitish reflecting spots and with 
discal and marginal macrochete. Legs with a short black pile and with scattered bristles; the dark 
rufous tibiee have black tips; foot-claws and pulvilli elongate, the pulvilli yellowish. Tegule and wings 
greyish ; base of the wings infuscated ; small cross-vein on the middle of the discal cell; curvature of the 
fourth vein rounded ; apical and posterior cross-veins curved. 
Hab. Mexico, Ciudad in Durango 8100 feet (forrer). 
A single male specimen. 
18. Rhynchodexia przusta, sp. n., 3. 
Blackish-cinereous ; antenne, palpi, legs, and hind margins of the abdominal segments black ; costal portion 
of the wings blackish. 
Length 9 millim. 
Head whitish, the lower part of the cheeks with brownish-rufous reflections ; face distinctly carinated ; front: 
trigonal, on the vertex so much narrowed that the eyes are nearly coalescent ; vibrissal swellings parallel. 
Antenne black ; second joint with some bristles, one of them longer than the others ; third joint twice 
as long as the second; arista thickened at the base. Proboscis shining black; palpi black, slender. 
Thorax and scutellum blackish, with some grey tomentum; thoracic dorsum with obsolete black stripes. 
Abdomen conical, black, with some cinereous tomentum on the front borders of the second and following 
segments, and with many discal and marginal macrochete. Legs black; tibiew with scattered bristles 
foot-claws and pulvilli elongate, the pulvilli yellowish-grey. Tegule large, yellowish-white. Wings 
grey, with a blackish or dark brown cloud on the base and on the beginning of the costa, in which two 
small hyaline spots are visible—one at the base of the second vein, the other under the end of the auxi- 
liary vein; small cross-vein on the middle of the discal cell; curvature of the fourth vein with a blunt 
angle; apical cross-vein slightly concave in one of the specimens, nearly straight in the other ; posterior 
cross-vein somewhat curved. 
Hab. Mexico, Ciudad in Durango 8100 feet (Forrer). 
Two male specimens. 
19. Rhynchodexia omissa, sp.n., ¢ 2. 
Thorax grey, with three black stripes; abdomen black, with grey reflecting spots ; palpi and base of the 
antenne rufous; legs black. 
Length 8°5-13 millim. 
Head whitish; cheeks and oral margin with rufous, the sides of the front with blackish, reflections ; front of 
the male much narrowed behind, that of the female a little broader than the eyes; frontal band black ; 
vibrissal swellings parallel. Antenne rufous; second joint prominent, with some long bristly hairs ; 
third joint twice as long as the second, blackish towards the tip; arista thickened at the base. Proboscis 
shining black, with small terminal lips; palpi pale rufous. Thorax grey; thoracic dorsum with three 
distinct black stripes (these stripes, however, not so sharply delineated asin R. striata) ; scutellum blackish. 
Abdomen conical ( ¢) or ovate (@ ), black, with whitish-grey reflecting spots, especially on the sides, and 
with discal and marginal macrochete, these being stronger but less numerous in the female than in the 
male. Legs black, with scattered bristles; the hind tibize in most of the male specimens somewhat 
rufous; foot-claws and pulvilli elongate in the male, the pulvilli blackish, with a yellow margin. Tegulz 
yellowish. Wings with a brownish-grey tint, slightly yellowish at the base; small cross-vein on the 
middle of the discal cell; apical cross-vein concave at its base ; posterior cross-vein distinotly curved. 
2h2 
