99 



19. Palpi yellow on at least the apical two-tliirds 22. 



Palpi, except the tips, black 20. 



20. Middle tibiie each bearing- two or more inacrocliieta' on the front 



side near the middle 21. 



Middle tibi.Te each bearing a single macrochieta on the front side near 

 the middle; black; front of male three-fifths as wide as either 

 eye, frontal bristles descending to the arista, no orbital bristles, 

 hairs of front numerous and rather long, cheeks one-eighth as 

 wide as the eye height, vibrissa? on a level with front edge of 

 the oral margin, ridges bristly on the lowest fourth, antenna? 

 almost as long as the face, the third joint six times as long as 

 the second, arista thickened on the basal fourth, thorax whitish 

 j)ollinose, marked with four bhick vittie, scutelluin bearing three 

 marginal pairs and a short, cruciate apical pair of inacroch<Tet;ie, 

 the latter curving backward and nearly horizontal; abdomen 

 shining, with a brassy tinge, narrow bases of the second and 

 third segments whitish polliuose, each segment bearing mar- 

 ginal macrocluet;e, the bristly hairs rather long and snberect; 

 front pulvilli slightly longer than the last tarsal joint; wings 

 hyaline, third vein bearing two or three bristles near the base; 

 calypteres white; length, 7 mm. Tifton, Ga. A male specimen 

 collected October 17, 1S96, by Mr. G. 11. Pilate. Type ^o. 3598, 

 U. S. National Museum poJita n. sp. 



21. With four postsutural macroch;Btai (see under 17) futilis O. S. 



With only three postsutural macrochiette, front in male four-tifths 



as wide as either eye, his third antennal joint three and one- 

 half times as long as the second, several macrocha^ta? outside 

 of the frontal bristles; length, 10 mm. Texas. (BiologiaCent.- 

 Amer., Vol. II, p. 70; February, 1890.) am/iistata v. d. W. 



22. Thorax bearing four postsutural uiacroch.Tta?, abdomen not tinged 



with bronze, apical cell open 24. 



Thorax bearing only three postsutural macrocha^tie, scutellum 

 black, middle tibi;e each bearing a single macrocha^ta on the 

 front side near the middle 23. 



23. Apical cell closed and short i)etiolate, abdomen strongly tinged with 



bronze; black, the palpi yellow; front of female one and one- 

 sixth times as wide as either eye, the sides bearing numerous 

 short hairs, two pairs of orbital bristles in the female, frontal 

 bristles descending almost to apex of second antennal joint, 

 cheeks nearly one-fourth as wide as the eye height, facial ridges 

 bristly on the lower half; antenna; five-sixths as long as the 

 face, the third joint three times as long as the second, arista 

 thickened on the basal third, the penultimate joint slightl}^ 

 longer than wide; thorax gray pollinose, marked with four 

 black vittip, scutellum bearing three long marginal and a short 

 apical pair of macrocha'tas abdomen gray pollinose on the 

 bases of the last three segments, its hairs closely appressed. 



