118 BULLETIN 31, UNITED STATES NATIONAL MUSEUM. 



conuect with tlie broad facial stripe, shining black. Antennae reddish 

 brown, third joint elongate-oval. Front only moderately narrowed at 

 the vertex, more than half as wide as at the base of the antennee, shin- 

 ing greenish black, on the sides below the yellow of the face extends 

 up along the eyes; the distance from the ocelli to the base of the an- 

 tennae is considerably less than from thence to oral margin. Eyes very 

 little convergent on lower part of head. Thorax shining greenish blue, 

 plenne with white pile. Scutellum yellow, brown or brownish across 

 the disk. Abdomen slender at the second segment, rather broadly 

 spatulate at the distal part; first segment black; second and third seg- 

 ments brownish black, lighter in front; on the sides at the front end 

 yellow and with white pile; fourth segment black, with a yellow, inter- 

 rupte<l, white pilose cross-band in front ; remainder of abdomen more 

 shining metallic. Legs brownish, tarsi darker, tip of femora and base 

 of tibiae yellowish. Wings hyaline, brown along the front border from 

 a little beyond the humeral cross-vein, more blackish on the stigma, 

 reaching back in the middle to or beyond the origin of the third vein, 

 and then evanescent outwards, anterior cross-vein near the basal third 

 of discal cell ; the third vein joins the costa immediately before the tip. 



S . Frontal triangle yellow, black immediately above the antennae, 

 the legs somewhat more yellowish, though this is probably not a sexual 

 character. The wings differ distinctly in that the brown is wholly 

 confined to the sub-costal cell, blackish at the stigma. 



Two female specimens (Professor Riley) collected by Mr. William 

 Patton, labeled " From spring larvae among Cotton Aphides, Selma, 

 Ala.," and one trom Arizona (Professor Comstock) ; an additional speci- 

 men (Professor Riley) with the label " Pnpa found in Orange. R. S. 

 Turner, Saint George, Fla., May 7, '80;" also two male specimens (Pro- 

 fessor Riley, No. 532, May 23, '80), Georgia? 



The male has the costal and marginal cells hyaline, while in the female 

 they are both in large part brown, yet it seems almost sure that they 

 belong to the same species. 



Baccha lugens. 



Baccha lugeua Loew, Centur., iii, 24. 



Habitat— ^ew York (O. S.), Southern States! 



S . Length, 10'"'". Front black-bronze, black pilose, above the au- 

 tenine yellow spotted. First two joints of the antennae yellow, black 

 pilose; third joint black. Dorsum of thorax and the scutellum black- 

 bronze, moderately shining, the color of the scutellum somewhat red- 

 dish bronze ; lower half of pleura? white-pollinose. Abdomen black, 

 oi)aque, not clavate near the tip, the base and apical margin of each 

 segment shining fuscous, ultimate segment wholly shining, sub-viola- 

 ceous black. Legs black, front and middle femora, excei)t the tip, base 

 of hind femora, and of the front and middle tibiae, yellow or yellow- 

 ish red. Halteres sordid whitish, head with a black spot. Wings 



