318 DIPTERA. 
eyes, the frontal band black and bifid towards the vertex; frontal bristles reaching to the root of the 
antenne, the lowest pair of these distinctly longer than the others in the female; face perpendicular ; 
vibrisse at the oral margin, which is not prominent and bears many shorter bristles. Eyes descending 
nearly to the underside of the head. Antenne rufous, inserted above the median line of the eyes ; second 
joint bristly ; third joint twice as long as the second, reaching to near the vibrissw, more or less infuscate 
at the tip; arista long-plumose. Proboscis blackish; palpi rufous, cylindrical, slightly thicker towards 
the end. Thorax cinereous, before the transverse suture whitish-grey, with four black stripes; two 
dorso-central bristles before and four behind the suture; scutellum ferruginous, blackish at the base. 
Abdomen of the male ovate; the first three segments yellow and transparent, with black margins—on 
the first segment this margin is very narrow, on the second it is broader and triangularly enlarged in 
the middle, and on the third it is still broader; anal segment cinereous, with indistinct black spots. In 
the female the abdomen is more attenuated towards the end, the ground-colour is more cinereous, and 
the black margins are less distinct. In both sexes there are macrochete at the hind margin of the third 
segment and on the anal segment. Legs rufous, with black tarsi; foot-claws and pulvilli scarcely longer 
in the male than in the female, the pulvilli whitish. Tegule yellowish. Wings greyish-hyaline; third 
and fourth veins nearly parallel; small cross-vein under the end of the first vein and beyond the middle 
of the discal cell; posterior cross-vein somewhat concave; the small cross-vein sometimes slightly 
infuscate, 
Hab. Mexico, Xucumanatlan in Guerrero 7000 feet (H. H. Smith). 
One male and three female specimens. 
A second male, probably a variety, from the same locality, differs from the other in 
having the basal half of the front femora, the median portion of the other femora, and 
a spot at the tip of each of them, black. 
4. Mydea fasciventris, sp. n., °. 
Cinereous ; thorax with four stripes, the abdomen with a dorsal stripe and the hind borders of the segments, 
blackish ; antenne and palpi rufous; legs piceous. 
Length 7 millim. 
Front as broad as the eyes, with parallel sides ; frontal band brown, as broad as the lateral portions, which 
are grey; the lowest pair of the frontal bristles a little stronger than the others. Face and cheeks 
whitish-cinereous; the face perpendicular; vibrisse inserted ata short distance above the oral margin; 
lower part of the cheeks under the eyes narrow and with many short bristles. Antenne rufous, inserted 
nearly on the median line of the eyes; second joint with a pair of bristles; third joint twice as long as 
the second ; arista slightly thickened at the base, long-plumose. Proboscis black, with rufous terminal 
lips; palpi rufous. Thorax cinereous, posteriorly with a rufous tinge; the four blackish stripes distinct, 
interrupted at the transverse suture; scutellum cinereous, with rufous tip. Abdomen broader than the 
thorax, cinereous ; first segment, hind borders of the second and third segments, and a dorsal stripe 
blackish ; weak macrocheet at the hind border of the third segment and on the anal segment. Legs 
piceous, the knees slightly rufous; foot-claws and pulvilli short. Tegule and wings greyish; small 
cross-vein a little before the end of the first vein and beyond the middle of the discal cell; third and 
fourth veins nearly parallel; terminal section of the fourth vein scarcely longer than the penultimate 
section ; posterior cross-vein slightly curved. 
Hab. Mexico, Teapa in Tabasco (H. H. Smith). 
A single female specimen. 
5. Mydea leucocephala, sp. n., ¢. 
Cinereous ; head whitish ; four thoracic stripes, reflecting spots on the abdomen, antenne, and palpi black ; 
legs rufous, tarsi and front femora black. 
Length 6 millim. 
