30 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 74 



Thorax blue-green dulled with brown pollen; pleurae green with 

 gray pollen. Abdomen and hypopygium blackish bronze, the latter 

 with pale hairs; base of abdomen yellowish brown, venter yellow; 

 appendages of the hypopygium very small, black. 



Coxae, femora, fore and middle tibiae and most of fore tarsi 

 yellow; tips of posterior femora and most of their tibiae brown; 

 middle and hind tarsi mostly black; bristles of posterior tibiae nu- 

 merous and some of them nearly as long as the diameter of the tibia ; 

 fore tarsi (fig. 39) with the fourth joint a little longer than third 

 and with little hooked hairs on upper surface; middle tarsi (fig, 40), 

 second and third joints each with a thumblike fork or projection at 

 tip, that on second reaching nearly to tip of third joint, that on third 

 nearly half as long as fourth joint, each with long hairs at their 

 tips; joints of fore tarsi as 3-30-13-14-6; those of middle ones, 

 without the projections as 43-13-5-7-8; joints of posterior pair as 

 21-26-12? 12 ?-7. Calypters yellow with a black tip and cilia; 

 halteres yellow. 



Wings slightly tinged with brown ; third and fourth veins parallel, 

 fourth ending in the apex of the wing; last section of fifth vein 35, 

 cross vein eleven-fiftieths of a millimeter long ; wing narrow at base. 



FeTnale. — Face wide, its pollen whitish ; color of the front, thorax, 

 abdomen and legs about as in the male; wings as in the male; fore 

 tarsi black from the tip of the first joint; middle tarsi brown, hind 

 tarsi black; joints of fore tarsi as 25-12-6-6-6; of middle ones as 

 32-12-10-6-6; joints of posterior pair as 19-23-12-9-8. 



Described from one pair taken by J. M. Aldrich, May 1, 1926, at El 

 Salto, Antigua, Guatemala. 



Type.— Male, Cat. No. 41044, U.S.N.M. 



Genus NEURIGONA Rondani 



Neurigona Rondani, Dipt. Ital. Prod., vol. 1, 1856, p. 142. — ^Wheelee, Proc. 

 California Acad. Sci., vol. 2, 1899, p. 72, table of species. — Van Duzee, 

 Annals Ent. Sec. Amer., vol. 6, 191.3, p. 22, table of species. 



Saucropus Loew, Monog. North Amer. Diptera, vol. 2, 1864, p. 224, table of 

 species. 



NEURIGONA BANKSI, new species 



Male. — Length 4.2 mm. Eyes broadly contiguous, very nearly 

 obliterating the face ; front dark blue-green ; palpi yellow ; antennae 

 yellow, third joint mostly brown, small, scarcely as long as wide, 

 somewhat conical in outline. 



Thorax yellow, darker on the dorsum; the depressed space before 

 the scutellum a beautiful blue-green, entire disk of scutellum of same 

 color, except a very narrow margin of yellow, also a narrow median 



