HYMENOPTERA. '^75 



and second segments densely clothed with a short velvety 

 ochraceous pubescence, inclining to an olive-yellow ; the apical 

 margin of the basal segment, and the basal margin of the second, 

 narrowly black. 

 Hab. Columbia. 



This is probably the female of C. decorata. 



28. CENTRIS INSIGNIS. 



Female. Length 11 lines. Black, the head ferruginous, 

 the front above the insertion of the antennae testaceous, the 

 scape and two basal joints of the flagellura ferruginous; the 

 apical half of the mandibles black ; the pubescence on the head, 

 thorax and legs fulvous ; the wings dark fuscous, and having a 

 violet iridescence ; the legs ferruginous. Abdomen, the second 

 segment densely clothed with very short pale yellow pubescence ; 

 a patch of the same at the extreme lateral margins of the third 

 segment. 

 Hab. Columbia. (Coll. W. W. Saunders, Esq.) 



29. CENTRIS FESTIVA. 



Female. Length 9 lines. Head and thorax black, a tuft of 

 pale pubescence between the antennae, and a pale testaceous spot 

 on the mandibles near their apex. Thorax densely clothed with 

 short dark olive pubescence, the wings rather dark fusco-hyaline ; 

 the posterior legs have dense scopae of long fulvo-ochraceous 

 pubescence. Abdomen of a rather obscure metallic-green ; the 

 base has a little short cinereous pubescence ; the margin of the 

 second segment narrowly and the third more broadly testaceous, 

 the former having a pale and the latter a bright fulvous pubes- 

 cence ; the fourth and fifth have a pale pubescence intermixed 

 with black hairs ; the apical segment fringed with bright ferru- 

 ginous hairs ; the sixth segment ferruginous. 

 Hab. Columbia. (Coll. W. W. Saunders, Esq.) 



30. CENTRIS AMERICANORUM. 



Ptilotopus Americanorum, JOM#,3f 017. Ber/m,1810,p.32. t.l. f. 1. 

 Centris Americanorum, St. Farg. Hym. ii. 156. 13 (nee Bombus 



Americanorum, Fabr.). 

 Hab. Cayenne. 



31. CENTRIS BOMBYFORMIS. 



Hemisia bombyformis. Spin. Ann. Soc. Ent. Fr. x. 148. 1(X) 9 



(1841). 

 Hab. Cayenne. 



s 5 



