372 HYMENOPTERA. 



dark brown pubescence, palest on the posterior margin of the 

 scutelhim ; the wings dark fuscous, having a sUght violet irides- 

 cence ; the legs black. Abdomen, the two basal segments have 

 a black pubescence, that on the following segments being of a 

 pale reddish-brown. 



Hab. Brazil. 



20. Centris maculifrons. B.M. 



Female. Length 7 lines. — Head and thorax black ; the cly- 

 peus has a broad transverse stripe anteriorly, united to a perpen- 

 dicular one yellow ; the face on each side of the clypeus, the 

 labrum and mandibles yellow, the latter black at their tips, the 

 anterior margin of the clypeus black ; the face has a little pale 

 pubescence at the insertion of the antennae and at the sides of 

 the face ; that on the disk of the thorax anteriorly fuscous, pos- 

 teriorly pale yellow, the collar, sides and thorax beneath pale 

 yellow ; the legs dark rufo-testaceous ; the anterior tibise fringed 

 behind with a thin pale pubescence, that on the tarsi brown ; the 

 intermediate and posterior legs have a black pubescence. Ab- 

 domen metallic green, the basal segment clothed with pale 

 pubescence ; the apical margin of the third segment, the fom'th 

 and fifth have a pale golden pubescence, the sixth segment 

 fringed with bright golden hairs. 



Hab. Brazil. 



21. Centris decorata. B.M. 



Male. Length 11 lines. — Black, the clypeus and labrum pale 

 testaceous, their margins more or less fuscous ; the disk of the 

 thorax clothed with short black pubescence, encircled with bright 

 yellow ; this colour also adorns the metathorax, the sides of the 

 thorax and the breast ; the wings nearly black, and having a 

 violet iridescence ; the legs black. Abdomen : the base has on 

 each side a little pale yellow pubescence, the second, third and 

 fourth segments clothed with olive-green pubescence ; their basal 

 and apical margins have a narrow border of black, the apical 

 segment fringed with long black pubescence. 



Hab. Brazil. 



22. Centris rubella. 



Female. Length 8 lines. — Head and thorax black ; the face 

 has a little white pubescence on each side, a tuft between the 

 ocelli, and the cheeks densely clothed with white ; the labrum 

 has a bright golden pubescence, the clypeus has a large testaceous 



