136 BULLETIN 31, UNITED STATES NATIONAL MUSEUM. 



13. — Secoufl vein near the tip regular, t. e., is not bent into the snbmarginal cell j 

 face and cheeks ^vithout black stripes; wings hyaline, with a faint brown 



spot at the tip of the auxiliary vein 14 



Second vein irregular near the end, bent into the submarginal cell .... 15 

 14. — Abdomen resplendent coppery blue, the base yellow or translucent, 



vesiculosa 

 Abdomen mostly yellow, brownish toward the tip, with three pairs of small quad- 

 rangular spots on the sides sezpunctata 



15. — Face yellow ; wings hyaline with brown spots 16 



Face with a black stripe ; wings subfasciate 17 



16. — Spots of wings distinct ; black abdominal fasciis obsolete in the middle . tau 



Spots of the wings less conspicuous; black abdominal fasciai complete. . satur 



17. — Wings distinctly fasciate with brown; pleurae with two yellow spots; yellow 



bands of abdomen interrupted pusilla 



Wings less distinctly fasciate; pleurae with five or six yellow spots; yellow 



abdominal bauds entire fasciata 



For other species see descriptions. 



Volucella evecta. (Plate VI, figs. 6, 6a7) 



Folucella evecta Walker, Dipt. Saunders., 251. 



Fohicella plumata Macquart (uon Fabr.), Dipt. Exot., 4e Suppl., 13L 



Habitat. — New England, Middle States, British Possessions! 



5,2. Length, 12 to 15"''". Face black, or pitchy black, clothed with 

 moderately abnndant yellow pile on the lower two-thirds, considerably 

 excavated below the an ten use and with a distinct broad protuberance 

 near the middle; in the male produced directly downwards; in the 

 female more rounded on the lower part and projecting rather more for- 

 M'ard. Third joint of antennae a little broader at the base, reddish-yel- 

 low or reddish-brown, black at the base; arista more than twice the 

 length of the antenuse ; long and abundantly feathery jdumose with 

 delicate pile. Front in female rather narrow, clothed with yellow pile; 

 yellowish on the sides, with a blackish median stripe ; frontal triangle 

 in the male small. Eyes bare in female, or at most only sparsely pilose 

 near the top, thickly pilose in male. Thorax black, shining, very abund- 

 antly light yellow pilose on the sides of the dorsum ; pleurae and scutel- 

 lum less abundantly pilose in the middle, where the ground color shines 

 through. Scutellum light yellow. Abdomen black, shining; on the sides 

 of the second segment with a large triangular yellow spot; thickly cov- 

 ered with yellow pile, which is less abundant in the middle of the seg- 

 ment; elsewhere the abdomen is thickly covered with erect black pde, 

 except rarely in some specimens (var. sangninea, new) the jwsterior por- 

 tion of the third and the remaining segments is clothed with longer, 

 erect, bright red or yellow pile. Legs black; the tip of the femora 

 and basal and terminal i)ortions of the tibiai, and all the tansi, reddish. 

 Wings brownish-hyaline, clouded along the v^eins ; a large spot opposite 

 the tip of auxiliary reaching to the fourth vein. Anterior cross-vein 

 nearly rectangular, situated near the proximal third of the discal cell. 



Fifty specimens. 



This species is related closely to V. bombylans of Europe, the variety 



