cr 
DIPTERA. 4 
~] 
TRICHOPHORA (p. 35). 
Siphoniomyia, Bigot, Bull. Soc. Ent. Fr. 1885, p. xii. 
Six Central-American species of the genus Zrichophora are now known to me, and 
they may be distinguished as follows :— 
1, Abdominal segments with discal and marginal macrochetz (abdo- 
men ovate; exterior cross-veins oblique). . . . . . . . . 2 
Abdominal segments with marginal macrochetx only. . . . . 3. 
2. Rufous species. . 6 6 1 1 ww ee ee ee we reeftna v. d. Walp. / 
Black species . 2. 2 1. 1 ee ee ee we ee ee. melas, Bigot. 
3. Abdomen ovate; apical cross-vein in a similar oblique position to 
the posterior cross-vein . . . . 1... wee ee 4. 
Abdomen conical; apical cross-vein perpendicular, the apical cell 
thus ending at a greater distance from the wing’s tip . . . . 5 
4, Basal joints of the antenne rufous . . . . . 1. 1 ee fucata, v. A. Wulp. 
‘Antenne wholly black . . 2. 1... ek ee es convexinervis, v. d. Wulp. 
5. Three genal bristles . . . 1 1 1. w 1 1 ew we we e Erisetosa, v. d. Wulp. 
A single genal bristle 2. 2 . 1. 1 1. 1 1. 1 ww we nitidifrons, v. d. Wulp. 
Trichophora rufina (p. 36). 
To the localities given, add:—Mexico, Atoyac in Vera Cruz (H. H. Smith). 
1 (a). Trichophora melas. 
Siphoniomyia melas, Bigot, Bull. Soc. Ent. Fr. 1885, p. xii’. 
Black ; face and cheeks white; cheeks with a single bristle; abdomen laterally rufous, with discal and 
marginal macrocheete ; tegule white; wings dark brown. 
Length 7 millim. 
Front broader than the eyes, black, somewhat shining; frontal band brown, opaque; frontal bristles 
descending irregularly to a little beneath the root of the antenne ; face and cheeks sericeous-white ; oral 
margin prominent; on the cheeks next the orbits a row of weak hairs and a stout bristle ; immediately 
above the vibrissw one shorter bristle and beneath them some other bristles; beard white; occiput grey. 
Antenne black ; second joint with some bristles; third joint twice as long as the second, much broader 
and obliquely truncated at the end ; arista thickened to near the tip, with a very short pubescence, which 
is only perceptible under a strong lens. Proboscis black, exserted, longer than the head. Thorax, 
scutellum, and abdomen shining black; thorax anteriorly with some white tomentum and indistinct 
black stripes; abdomen ovate, convex, laterally rufous; anal segment with a faint whitish tomentum; 
macrochete as in 7’. rufina. Legs black; front tibie with short bristles on the outer edge; middle and 
hind tibia with many long and stout bristles; foot-claws and pulvilli rather elongate, especially those on 
the front and middle tarsi, the pulvilli yellow. Tegule white. Wings dark brown; small cross-vein 
on the middle of the discal cell ; apical and posterior cross-veins oblique, the apical deeply concave at its 
base, the posterlor convex. 
Hab. Mexico (coll. Bigot '). 
The above description is taken from the well-preserved typical specimen kindly 
communicated by M. Bigot. It isa male (not a female, as stated in his description 1), 
