284 J. M. ALDRICH. 



Wings large and broad, with tlie usual two crossbands. which are connected in 

 front as far as the third vein, which curves broadly backward in the latter part 

 of its course, and then at the tip gently forward, in the manner typical of 

 Agonosoma. Second posterior cell largely subhyaline. 

 Length 8 mm. 



One male, Rio cle Janeiro, November (Dr. Williston). 



This is the specimen referred to in Ivans. Univ. Quart., II, 47, 

 as being intermediate between Gnamptopsilopus and the restricted 

 genus Psilopas. It has four hirge bristles on the scutellum. 



Fsilopodiniis viridicoxa sp. nov. 



Strikingly similar throughout to scaber, but has the fore coxae green, with yel- 

 low tip. 



Face green, thinly white pollinose, antenna^ black, small, with one or two 

 rather noticeable bristles above on the second joint; front bright green, pollinose 

 on the lower border, with a few pale hairs on the sides. Tharax bright green, 

 the sides moderately pollinose ; halteres yellow. Abdomen green, with narrow 

 black bands; hypopygium small, black, with minute black appendages. Front 

 coxse green, the tips yellow, densely covered with white hair, and moderately 

 pollinose with white; trochanters black, the fore ones somewhat yellow- 

 ish; femora and tibiae yellow; fore and middle tarsi infuscated from the tip of 

 the first joint, hind tarsi wholly infuscated ; fore tibia on the hind side with a 

 row of five or six smallish bristles, ending before the tip. Fore tarsus once and 

 a half the length of the tibia; the first joint has on the under side a row of fine 

 hairs and a few scattered bristles; middle tibia with a row of close, erect bris- 

 tles, some 30 in number, on the inner side in front; this row continues the greater 

 part of the length of the metatarsus, and there are besides a number of scattered 

 small hairs on the under side of the metatarsus; hind tibia rather hairy, with 

 three small bristles on the outer side. Wings with the usual two crossbands, 

 which are narrower than in most species, and sometimes not very prominent ; 

 apex of wing largely hyaline. 



Femah. — This sex has yellow fore coxse, hence I am unable to find any available 

 characters to separate it from scaher or sipho. I have many specimens of the three. 



Length 6.4 mm. 



About 40 males, Opelousas, La., April and May (Dr. Hough). 



Pxiilopodiiiiifii flavipeisi sp nov. 



Male. — Face pollinose with whitish, and bearing numerous pale hairs; an- 

 tennae black, with only one or two rather long hairs below on the second joint ; 

 front bright green. Thorax bright green, the sides thinly dusted with white 

 pollen; halteres yellow. Abdomen bright green, with very narrow bands of 

 black; hypopygium very small, almost entirely enclosed in the abdomen, but 

 with a pointed end directed forward. Legs, except middle and hind coxae and 

 their trochanters, yellow; fore and middle tarsi infuscated from the tip of the 

 first joint ; hind tarsi and tips of the tibiae infuscated. On the outer side of the 

 hind tibia before the middle is a conspicuously long bristle ; otherwise the legs do 

 not show any characters of importance. Wings hyaline, venation as in caudatiis. 



Female. — Face with the same hairs; middle. tibiae with two or three scattered 

 long bristles ; fore tibiae with a few smaller. 



Length 3.6 mm. 



