154 DIPTERA. 
Antenne black, somewhat shorter than the face; basal joints short; third joint slender, five times as 
long as the second ; arista thickened to the proximal half. Thorax at the sides and before the transverse 
suture with grey tomentum, anteriorly with indistinct black stripes. Abdomen as long as the thorax, in 
the male conical and convex, in the female compressed at the sides; the front borders of the last two 
segments laterally with a whitish reflection ; macrochete only at the hind margins of the segments; in 
the female the anal segment has a long dagger-like projection (the ovipositor?), which is directed towards 
the venter. Legs black, bristly. Tegule and wings greyish-hyaline; small cross-vein on the middle of 
the discal cell; curvature of the fourth vein with a blunt angle; posterior cross-vein straight, in the 
middle between the small cross-vein and the curvature of the fourth vein. EB gf hoeth frawe £ weal 2 oth ah 
Hab. Mexico, Amula 6000 feet, Omilteme 8000 feet, both in Guerrero, Atoyac in 
Vera Cruz (H. H. Smith). 
A male and two female specimens. 
8. Degeeria monochroma, sp. n., 2. 
Shining black; thorax anteriorly with scarcely any grey tomentum; antenne long; palpi rufous. 
Length 2 millim. 
One of the smallest Tachininw. Face black, with white reflections; front as broad as the eyes, almost wholly 
occupied by the black frontal band; facial bristles mounting to the point where the frontal bristles 
terminate. Antenne as long as the face ; basal joints very short; arista inserted at the base of the third 
joint and thickened to the proximal half. Thorax with white humeral spots and somewhat greyish on 
the anterior margin. Abdomen ovate, without any light markings; discal and marginal macrocheetee 
present. Legs black; hind tibiz with several bristles. Tegule and wings greyish-hyaline ; small cross- 
vein distinctly before the middle of the discal cell; curvature of the fourth vein with a blunt angle; 
posterior cross-vein straight, nearly perpendicular, in the middle between the small cross-vein and the 
curvature of the fourth vein. 
Hab. Mexico, Atoyac in Vera Cruz (H. H. Smith). 
A single female specimen. 
9. Degeeria leucocycla, sp. n., ¢ . 
Black; thorax anteriorly grey, with four black stripes; abdomen with white front borders to the segments ; 
palpi rufous; apical cell sometimes closed at the wing’s margin. 
Length 3 millim. 
Face and sides of the front with grey reflections; front as broad as the eyes; frontal band black, as broad as . 
the lateral portions; frontal bristles descending as far as the end of the second antennal joint; facial : 
bristles reaching to half the face. Antenne black, shorter than the face; third joint four times as long 
as the second; arista thickened to the proximal third. Palpi pale rufous, enlarged towards the tip. 
Thorax before the transverse suture with whitish-grey tomentum and four black stripes. Abdomen 
convex, subcylindrical in the male, ovate in the female; second and following segments with white front 
borders, which are interrupted by a black dorsal line; discal and marginal macrochete present. Legs 
black; hind tibiee outwardly with a row of bristles; foot-claws and pulvilli short in both sexes. Tegule 
whitish. Wings greyish-hyaline, with a short costal spine ; small cross-vein on the middle or somewhat 
before the middle of the discal cell; curvature of the fourth vein rounded ; apical cell very narrowly 
pened, sometimes closed on the wing’s margin at a little distance from the wing’s tip ; posterior cross- 
vein slightly curved or nearly straight. 
Hab. Mexico, Dos Arroyos 1000 feet, Chilpancingo 4600 feet, Amula 6000 feet, and 
Omilteme 8000 feet, all in Guerrero, Atoyac in Vera Cruz (H. H. Smith). 
Several males and one female. 
