HYMENOPTERA. 373 



spot on each side, and the mandibles a similar spot near their 

 apex. Thorax : the disk covered with very short black pubes- 

 cence, a little pale pubescence on each side of the collar, a tuft 

 behind the wings ; the metathorax has laterally a little fuscous 

 pubescence ; the legs rufo-testaceous, the anterior and interme- 

 diate pairs fuscous above, their tarsi densely clothed with rufous 

 pubescence ; the scopa on the posterior legs bright fulvo-ochra- 

 ceous above, beneath having a ferruginous stain ; wings dark 

 fuscous, with a purple iridescence. Abdomen ferruginous. 



Hab. Brazil (Rio Tapajos). 



23. CENTRIS PLUMIPES. B.M. 



Female. Length 9 lines. Black, the head and thorax black, 

 the former having a purple or aeneous tinge on the face and 

 vertex ; the clypeus on each side, as well as the anterior angles of 

 the face, the labrum and mandibles pale testaceous ; the cheeks 

 densely clothed with cinereous pubescence ; there is also a little 

 short cinereous pubescence between the antenna. Thorax : the 

 middle of the disk has an aeneous tinge, densely clothed above 

 and at the sides with a short black pubescence, beneath it is pale 

 bright ochraceous ; the legs have more or less of an aeneous tinge 

 above ; the anterior and intermediate legs, above, have their pubes- 

 cence black, that on the tarsi beneath reddish-brown; the posterior 

 tibia? and tarsi pale rufo-testaceous, densely clothed exteriorly 

 with long pale ochraceous pubescence, the hairs beautifully pec- 

 tinated or plumose ; the wings dark fuscous, beautifully tinged 

 with a purple iridescence. Abdomen olive-green at the base, 

 gradually becoming coppery towards the apex. 



The male only differs in having the clypeus and labrum 

 entirely pale testaceous, the former having a broad spathuliform 

 black mark in the middle. 



Hab. Brazil (Santarem). 



24. CENTRIS FLAVOPICTA. B.M. 



Male. Length 10 lines. Head and thorax black, the latter 

 as well as the cheeks covered with cinereous pubescence ; the 

 scape in front, the anterior margin of the clypeus and a perpen- 

 dicular line uniting with it, a transverse line above it, the sides 

 of the face, the labrum and mandibles yellow, the latter ferrugi- 

 nous at their tips ; the legs yellow, the femora black at their 

 base, and the tibiae having a black spot above ; the pubescence 

 on the legs fulvous ; the wings smoky, towards their apical mar- 

 gins subhyaline. Abdomen yellow, the margins of the segments 

 rufo-piceous, having more or less of a metallic tinge ; the apex 



