PROSENA. 217 
Tepetlapa, Hacienda de la Imagen, Chilpancingo, Sierra de las Aguas Escondidas, and 
Omilteme, all in Guerrero, 2000-8000 feet (H. H. Smith). 
A large series of specimens of both sexes. 
This insect may perhaps be conspecific with Prosena mexicana, Macq. (Dipt. Exot., 
Suppl. 4, p. 231. no. 7, t. 21. f. 12); but the coloration of the abdomen seems to be 
- different. 
4. Prosena curvirostris. © >* | 
Prosena curvirostris, Bigot, Ann. Soc. Ent. Fr. 1888, p. 264. 
Cinereous ; antenne and palpi rufous; thorax with three black stripes; abdomen with brown or blackish ' 
reflecting spots and with marginal (but not discal) macrocheete on the segments; legs black. 
Length 7:5 millim. 
Head whitish-grey ; front of the male narrow behind, that of the female broader than the eyes; frontal band 
piceous, reddish towards the antennx; frontal bristles descending as far as the root of the antenne; 
close to the oral margin some rufous reflection. Antenne much shorter than the face, rufous; second 
joint with short bristles; third joint twice as long as the second, infuscated towards the tip ; arista black, 
densely plumose, thickened at the base. Proboseis black, as long as the head and thorax together; palpi 
thin, rufous. The median band of the thorax is narrowed towards the head and sometimes accompanied 
on each side by a black line. Abdomen of the male conical, yellowish-cinereous, with a more or less 
distinct, interrupted, blackish dorsal stripe and brownish or blackish reflecting spots at the hind borders 
of the segments—that of the female ovate, cinereous (without a yellowish tint), and with blackish reflecting 
spots as in the male. Legs with weak bristles; foot-claws and pulvilli in both sexes short. Tegule 
yellowish-white. Wings greyish, with black venation ; small cross-vein on the middle of the discal cell ; 
curvature-of the fourth vein with a blunt angle; apical cell opened at a very short distance from the 
wing’s tip; apical cross-vein nearly straight ; posterior cross-vein oblique and slightly curved. 
Hab. Mexico (coll. Bigot), Tierra Colorada 2000 feet, Rincon 2800 feet, Chilpan- 
cingo 4600 feet, Amula 6000 feet, all in Guerrero, Atoyac and Fortin in Vera Cruz, 
Teapa in Tabasco (H. H. Smith); Costa Rica, Rio Sucio (Rogers). 
Several examples of both sexes: 
The identity is secured by comparison with a typical specimen which M. Bigot has 
been kind enough to send me for examination. 
5. Prosena meleena, sp.n.,¢ 2. Pea 
Shining black; head whitish ; abdominal segments only with marginal macrochasta ; tegule and base of the 
wings brownish. 
Length 7-9°5 millim. 
Front slightly prominent, blackish, laterally bordered with white, in the male narrowed behind, in the female 
broader than the eyes; frontal bristles descending as far as the root of the antennw; face and cheeks 
whitish, the face distinctly carinated, its median portion with a rufous, the cheeks with a blackish, reflection. 
Antennz black, much shorter than the face; second joint bristly ; third joint three times as long as the 
second; arista densely plumose, thickened at the base. Proboscis and palpi black; the proboscis a little 
shorter than the head and thorax; the palpi slender, scarcely thickened towards the tip. Thorax, scu- 
tellum, and abdomen shining black, the thorax anteriorly with four obsolete whitish spots (two median 
and two humeral); the thorax is densely covered with black hairs; the scutellum bears some long 
macrochete. Abdomen of the male subconical, in most of the specimens more or less reddish laterally, 
that of the female ovate; on the second and following segments are marginal (but no discal) macrochete. 
BIOL. CENTR.-AMER., Dipt., Vol. II., April 1891. 2f 
