386 DIPTERA. 
Hab. Mexico, Presidio de Mazatlan (Forrer), Dos Arroyos, Tierra Colorada, and 
R. Papagaio, all in Guerrero, Atoyac in Vera Cruz (H. H. Smith) —Sovutu America}, 
Guiana ?; Braziu 2. 
A long series of specimens of both sexes. The males agree in the dark colour of 
the face, antennw, and fore legs with Wiedemann’s description. The females have the 
head, antenne, and anterior femora inclining to yellowish-rufous, the anterior femora 
often with a more or less extended black spot or stripe. In both sexes the coxe, 
including the anterior pair, are black. I have no doubt that the females mentioned 
by Schiner (loc. cit.) belong to the same species. The first abdominal segment is not 
rufous, as in some of the following species, though it shows a slight tendency to become 
so; and in this respect there is a discrepancy with Wiedemann’s and Fabricius’s 
descriptions, where the basal segment is explicitly stated to be rufous. 
The median band of the wings is distinctly attenuated towards the posterior margin ; 
the apical spot does not reach the end of the second vein. 
2. Richardia viridiventris, sp. n., 3 2. 
Thorax black, with some whitish markings; abdomen greenish-black, the first segment rufous; all the coxe 
black. 
Length 6°5 millim. 
Front brownish-testaceous, the sides blackish ; vertex and occiput shining black; face blackish, with grey 
dust ; oral margin rufous. Antenne brown, third joint elliptical, three times as long as the second; 
arista finely plumose. Proboscis and palpi rufous. ‘Thorax black, with a median stripe and lateral spots 
whitish ; pleurz very shining, before the wings with an oblique whitish band; scutellum and metanotum 
shining black. Abdomen elongate, slightly attenuated at the base, shining black, with a greenish- 
metallic reflection, and with a short, brown pilosity ; the first segment short, yellowish-rufous, this rufous 
colour often more or less prolonged along the ventral side; the second segment much longer than the 
others and bearing on each side a pair of long bristles. Legs rather elongate; hind femora incrassated, 
inferiorly spinose ; coxw and femora black, the middle femora rufous towards the tip, the hind femora 
with the base and a ring before the tip rufous; tibize and tarsi yellowish-rufous, the front tibia and the 
terminal two or three tarsal joints often infuscated ; the hind tibie straight. Halteres yellow. Wings 
greyish-hyaline, with a broad brown median band, including the two cross-veins, and a brown apical 
spot, which does not reach the end of the second vein. In the females the bead and antenne are 
somewhat clearer in colour and more rufous; the tip of the antenne, however, is brown. 
Hab. Mexico, Teapa in Tabasco (H. H. Smith). 
Several male and two female specimens. This species is closely allied to R. podagrica. 
The abdomen is not steel-blue, but greenish-black, with the first segment rufous; the 
cross-veins are a little more distant and the brown median band is hardly narrower 
towards the hind margin. 
8. Richardia elegans, sp.n., ¢ 2. (Tab. X. fig. 17.) 
Thorax testaceous; scutellum black; abdomen steel-blue, the first segment rufous in the ¢; head, antenne, 
and legs yellowish-rufous, the hind femora with a brown ring; apical spot of the wings large, reaching 
the end of the second vein. 
Length 6 millim. 
