372 HYMENOPTERA. 



dark brown pubescence, palest on the posterior margin of the 

 scutellum ; the wings dark fuscous, having a slight 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 tibiae 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 fourth 

 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 



