88 
DIPTERA. 
chete are on the hind margin of the second and third segments and there are several on the anal 
segment. Legs black, the posterior tibie piceous; the tarsi in both sexes slender; foot-claws black, the 
pulvilli yellowish, both somewhat elongate in the male; bristles of the legs weak, some longer ones on the 
outside of the middle tibia. Tegule whitish. Wings grey, with a dilute brownish tint at the base and 
along the costa; a small costal spine is present; the cross-veins are thick and more or less infuscated ; 
small cross-vein on the middle of the discal cell ; curvation of the fourth vein forming a right angle and 
with a short appendage; apical and posterior cross-veins distinctly curved ; apical cell opened a little 
before the tip of the wings. 
Hab. Mexico, Omilteme 8000 feet, and Sierra de las Aguas Escondidas 9500 feet, 
both in Guerrero (H. H. Smith). 
Several male and a few female specimens. 
2. Trixa differens, sp.n., ¢ 9. 
Thorax and scutellum cinereous; abdomen rufous with a black dorsal stripe (3), or black with whitish 
reflections on the anal segment (2); antenn# rufous ; legs black ; foot-claws yellow, black at the tip; 
wings brownish, rufous at the base. 
Length 13 millim. 
Shape of the head and arrangement of the frontal and facial bristles as in the preceding species; frontal 
band brown, the sides of the front dark cinereous; face and cheeks white, with ochraceous reflections. 
Antenne rufous, the third joint brown towards the tip; arista black, thickened to beyond the middle. 
Proboscis shining black; palpi small, rufous, with black hairs. Thorax and scutellum yellowish- 
cinereous; on the thoracic dorsum four black lines, which are interrupted at the transverse suture. 
Abdomen ovate, convex, very different in coloration in the two sexes: in the male it is bright rufous, 
with a large black spot on the first segment and a narrow black dorsal stripe on the following segments ; 
in the female it is black, with some white reflections on the anal segment, which are most conspicuous at 
the sides; macrocheete are on the hind margins of the second and third segments and there are several 
on the anal segment, those of the second segment sometimes absent in the male. Legs black, rather long 
and slender; foot-claws and pulvilli elongate in the male, yellow, the claws black at the tip; bristles of 
the legs weak, Tegule dark grey, with a narrow yellow margin. Wings brownish, more intensely so in 
the subcostal cell and along the veins ; the base and costa, including the mediastinal cell, pale rufous ; 
neuration as in 7’. obsoleta. 
Hab. Mexico, Omilteme in Guerrero 8000 feet (H. H. Smith). 
Two male and four female specimens. 
MILTOGRAMMA. 
Miltogramma, Meigen, in Iliger’s Magaz. ii. p. 280 (1803). 
is 
sp 
The Central-American collections before me contain four species of this genus, which 
well-detined by its short antenne, very weak macrochete, and peculiar facies. These 
ecies belong to the group distinguished by the presence of vibrisse, and for the recep- 
tion of which Rondani has formed his genus Sphixapata. 
1. Anal segment grey, concolorous with the preceding segments. 2. 
Anal segment rufous. . . 2. . . 
2. Antenne black . . . 2. 1 1 1. 1 we. . . . . trilineata, v. d. Wulp. 
Antenne red. 2. . . - . . . fulvicornis, v. d. Wulp. 
8. Frontal band rufous ; stripes of the thorax obsolete . - . . erythrura, v. d. Wulp. 
Frontal band black ; thorax with three distinct black stripes . sarcophagina, v. d. Wulp. 
