DIPTERA. A477 
One male and three females have been received from Mr. Smith. The male has 
the abdomen somewhat rufous at the sides, but for the rest is very like the female, 
except that the foot-claws and pulvilli are more elongate. Of the three genal bristles 
the inferior one is smaller than the others and seems to be absent in some individuals. 
This species is a little more robust than 7. nttidifrons, and has the apical and 
posterior cross-veins slightly curved (in 7. nitidifrons they are straighter and the 
apical cross-vein has a still more perpendicular direction). 
Trichophora nitidifrons (p. 37). 
To the locality given, add :—-Mexico (coll. Bellardi), Dos Arroyos, Venta de Zopilote, 
Tepetlapa, Amula, Atoyac, Teapa (H. H. Smith), Orizaba (Godman & H. H. Smith), 
N. Yucatan (Gawmer). 
The numerous specimens now received vary from 55-10 millim. in length, the 
smallest ones being females. 
GYMNOMMA (p. 38). 
2. Gymnomma, discors. 
Gymnomma discors, v. d. Wulp, Tijdschr. voor Ent. xxxv. p. 193°. 
Thorax cinereous ; scutellum, abdomen, legs, and basal joints of the antenns rufous, third antennal joint 
black ; third and anal abdominal segments with discal and marginal macrochete. 
Length 8 millim. 
Face and cheeks ochraceous; front yellowish-cinereous, as broad as (3), or broader than the eyes (2); 
frontal band dark rufous, narrower behind; frontal bristles nearly as in Gt. nitidiventris; cheeks with 
yellow hairs. Basal joints of the antenne rufous, the second bristly on its upper part; third joint black, 
ovate, a little longer and much broader than the second; arista thickened in its proximal half. Proboscis 
shining black. Thorax yellowish-cinereous; before the transverse suture with some indistinct dark 
stripes ; scutellum rufous, with long macrochete at the hind margin. Abdomen convex, broadly ovate, 
rufous, with some indication of blackish dorsal spots; macrochets at the hind margins of the segments 
and discal macrochete as well on the last two segments. Legs rufous; tarsi usually brownish ; foot- 
claws and pulvilli yellow, the claws with a black tip; in the male the claws and pulvilli elongate ; 
bristles of the legs as in G@. nitidiventris. Tegule yellowish-rufous. Wings dark grey, rufous at the 
base ; venation nearly as in G. nitediventris. 
Hab. Mexico! (coll. Bellardi), Xucumanatlan and Omilteme in Guerrero 7000 to 
8000 feet (H. H. Smith). 
Ten males and two females of this species have been sent by Mr. Smith. It much 
resembles Saundersia nigropilosa, but can easily be distinguished from that insect by 
the non-spiniform macrochete of the abdomen. 
On account of the presence of discal macrochete on the last abdominal segments in 
G. discors, the characters of the genus, as they are given on p. 38 (anted), must be 
altered in this respect. 
BIOL. CENTR.-AMER., Dipt., Vol. II., May 1903. 39 
