DIPTERA. 



501 



from the costa to its tip ; furcation of the third vein beyond the distal end of the discal cell ; fourth 

 posterior cell petiolate. Length 15 millim. 



Hab. Mexico, Xucumanatlan in Guerrero 7000 feet (H. H. Smith). 



Fifteen specimens. The abdomen is sometimes almost wholly brown, at other 

 times yellowish. The ring of the hind femora is not always distinct : in some examples 

 the femora would be best described as brownish-yellow in colour, with a broad 

 prseapical yellow ring. The species is related to L. badia, Loew, differing from it in 

 having the fourth posterior cell short-petiolate, the rings of the femora indistinct, &c. 



6. Leptogaster dorsalis, sp. n. 



2 . Very much like L. macropygialis, but with the third antermal joint more oval, the style thicker and only 

 about as long as the third joint, the mesonotal margins more broadly grey, leaving three, subconfluent, 

 brown stripes ; the abdomen appears to have broader grey hind-margins ; the thickening of the hind 

 femora is more pronounced, the dark markings less distinct ; and the tarsi have distinct, but short, 

 empodia. The anterior cross- vein is a little more distal in position. Length 8-9 millim. 



Hab. Mexico, Xucumanatlan and Omilteme in Guerrero, 7000 to 8000 feet 



(H. H. Smith). 



Four specimens. The middle tibia? have a slender blackish line on the front side. 

 The species is yet more closely allied to L. varices, Loew, from which it differs in 

 having the second joint of the antennae yellow, the fourth posterior cell quite 

 sessile, &c. 



7. Leptogaster macropygialis, sp. n. (Tab. V. fig. 14, s .) 



of $ . Distance from the upper ocelli to the root of the antennae about one-half that from the antennas to the 

 oral margin. Antennas yellow, the third joint, except its immediate base, brown ; the latter rather long, 

 narrow, and tapering ; style shorter than the third joint. Front brownish-yellow-pollinose ; the very 

 narrow face whitish-yellow-pollinose. Proboscis black. Occiput without bristles. Thorax light yellow, 

 the pleura? and the immediate margins of the mesonotum silvery-pollinose ; mesonotum elsewhere opaque 

 dark brown. Abdomen opaque, nearly black, slender ; first segment yellow, the posterior margin of the 

 others whitish-pollinose ; hypopygium of the male very large and complicated, the lateral inferior forceps 

 with long bristles, and there is a large, globular, shining black swelling below. Legs light yellow ; the 

 tips of all the femora and tibiae, a broad ring on the middle of the four posterior femora and tibiae, and a 

 less distinct one on the anterior femora and tibiae, brown ; tarsal joints brownish at the tip; hind femora 

 much thickened on the distal half; empodia wanting. Wings hyaline; furcation of the third vein 

 opposite the distal end of the discal cell ; veins at the basal end of the second and third posterior cells of 

 nearly equal length ; anterior cross-vein situated nearly opposite the proximal end of the fourth posterior 

 cell, which borders narrowly on the second basal cell. Length 11 millim. 



Hab. Mexico, Teapa in Tabasco (H. H. Smith). 



Four specimens. This species will be at once distinguished from L. varices, Loew 

 (1.=pictipes, Loew), to which it is closely allied, by the absence of the empodia. 



8. Leptogaster micropygialis, sp. n. 



$ 2 • Front short, the distance from the upper ocelli to the root of the antennae distinctly less than half that 

 from the latter to the oral margin. Front brownish-yellow ; face silvery- white. Proboscis black. 



