SOUTH AMERICAN DIPTERA. 275 



Eleven specimens, Chapada. The marginal cell varies much, as 

 does also the color of the distal abdominal segments. The disk of 

 the mesonotum is sometimes coppery red, with only a weak purple 

 or violet reflection, at other times deej^er. 



53. Volucella puuctifera? Bigot (? V. testacea Eondani). 



Two specimens ( $ ? ) agree with Bigot's description fairly well, 

 but its brevity will not permit any certainty in the determination. 

 The marginal cell is closed in the costa, and the tibiae and tarsi are 

 blackish, rather than brownish. 



54. Volucella pallens Wiedemann {V. sexpunctata Loew.). 



Two specimens, Rio de Janeiro. The specimens offer no note- 

 worthy differences from North American ones. 



55. Volueella tyinpauitis Fabr. 

 One male specimen, Chapada. 



56. Volucella picta Wied. 



Fourteen specimens from Chapada. The species is closely allied 

 to jnis ilia Macq., but is distinct. There is so much variation among 

 the specimens that identification might be doubtful w'ith certain iso- 

 lated ones. While in some of the females the median facial stripe is 

 but little darkened, in the greater number there is a distinct black 

 stripe. In all the males there is a quadrate lateral spot in front of 

 the suture ; in the females there is an additional, slender, acuminate 

 spot from the suture to the post-alar callus. The thorax in the males 

 is chiefly black pilose above ; in both the males and female there is 

 black pile on the borders of the scutellum ; the small, yellow, pres- 

 cutellar spots are sometimes wanting, etc. 



57. Volucella viridis n. .sp. 



% .—Length 7 — 8 mm. Eyes with erect white hairs, giving a peppered ap- 

 pearance ou front view. Frontal triangle small, yellow, third joint not at all 

 incised ; arista chiefly yellow, thinly but moderately long, black plumose. Face 

 shining green, with blue reflections, sparsely clothed with yellowish hair; pro- 

 jecting downward, but not acutely so, the concavity above deep, the tubercle 

 rather obtuse. Thorax brilliant shining green, the mesonotum with violet re- 

 flections ; pile erect, not very abundant, golden yellow. Scutellum violet, the 

 tip more or less luteous; before tTie tip with a transverse depression. Lateral 

 margins of the mesonotum and scutellum with hairy bristles. Abdomen wholly 

 bright shining green, with erect, short, yellow pile. Legs luteous, the hind 

 femora with some green reflections; all the femora and tibiie with pile, chiefly 

 black, giving a ciliated appearance, especially ou the hind tibife ; hind metatarsi 

 a little thickened. Wings nearly hyaline on the basal half or more, abruptly 

 brownish on the outer part ; marginal cell narrowly open. 



