HYMENOPTERA. 373 



spot OQ 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. 



Hub. Brazil (Rio Tapajos). 



23. Centris plumipes. B.M. 



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

 the former having a jjurple or jEneous tiuge on the face and 

 vertex ; the clvpeus 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 anteunje. Thorax : the 

 middle of the disk has an peneous 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 reckUsh-brown; the posterior 

 tibise and tarsi pale rufo-testaceous, densely clothed exteriorly 

 v\ith long pale ochraceous pubescence, the hairs beautifully pec- 

 tinated or plumose ; the wings dark fuscous, beautifully tinged 

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

 gradually becoming coppery towards the apex. 



The male only diifers in having the clypeus and labrum 

 entirelv pale testaceous, the former having a broad si)athuliform 

 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 labnim 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 



