ART. 10 TROPICAL AMERICAN DIPTERA VAN" DUZEE 23 



This has the third and fourth A-eins quite far apart as in Diaphorus 

 and has the fore pulvilli slightly enlarged, otherwise it is a typical 

 Chrysottis. 



Genus ARGYRA Macquart 



Argyra Macquart, Hist. Nat. Dipt., vol. 1, 1834. p. 45G. — Lop:w, Mon. N. Am. 

 Diptera, pt. 2, 1S64, p. 123, table of si>ecies. — Van Duzee, Proc. U. S. Nat. 

 Mus., vol. 66, 1925, pp. 1-23, table of N. A. species. 



ARGYRA VIOLACEA, new species 



Fenude. — Length 5 mm. Face silvery white, rather narrow, wider 

 below, the portion below the suture about two-thirds as long as upper 

 part; palpi large, black, covered with white pollen and black hair; 

 proboscis yellow; front violet with thin white pollen; first two an- 

 tennal joints black, first with many hairs above (third joint missing 

 in type) ; lower orbital cilia long and wdiite. 



Dorsum of thorax and scutellum wholly shining violet; pleurae 

 more blue-green, dulled wnth white pollen, pleural sutures and pos- 

 terior edge of pleurae yellow; scutellum bare with two large mar- 

 ginal bristles; propleurae largely yellow; humeri surrounded with 

 yellow\ Abdomen yellow, second to fifth segments black above on 

 anterior edge, the black extending to posterior margin in the middle, 

 narrowly so on second segment, more widely on each succeeding 

 segment. 



Coxae yellow, middle ones with a blackish streak on outer surface ; 

 anterior surface of fore coxae with short white hair, hairs of mid- 

 dle ones and bristles of all coxae black ; all femora yellow with short 

 hair ; fore and middle tibiae yellowish-brown, posterior ones brown ; 

 all tarsi black or dark brown ; joints of fore tarsi as 99-33-29-16-12 ; 

 of middle ones as 123-43-32-12-8 ; joints of posterior pair as 28-79- 

 48-21-12. Calypters small, black with long black cilia ; halteres pale 

 yellow. 



Wings dark gray; third vein bent backward at tip; last section of 

 fourth vein bent near its middle, the part beyond this bend nearly 

 straight and approaching third vein toward its tip, ending just 

 back of the apex of the wing ; last section of fifth vein 30, cross vein 

 thirty-nine fiftieths of a millimeter long; wing narrow at base, so 

 that the sixth vein runs parallel with the wing margin, its tip con- 

 tinued as a thin fold, which curves abruptly to the wing margin 

 about opposite the middle of first vein. 



Described from one female, taken by C. M. Rouillard, at La Provi- 

 dencia, Obispo, Guatemala. 



Type.— Female, Cat. No. 41037, U.S.N.M. 



This species is remarkable for the short posterior basitarsi. 



