Mr. F. Smith on the Genus Centris. 361 



labrum covered with black pubescence ; wings dark brown, 

 palest at the apical margins, and with a violet iridescence. 

 Hah. Mexico ; Vera Cruz. 



*19. Centris agilis. 



Male. Length 9^ lines. Black, with the abdomen ferru- 

 ginous. The thorax densely clothed with short sooty-black 

 pubescence ; that on the anterior and intermediate legs is of 

 the same colour, as well as that on the posterior femora ; on 

 the tibias and tarsi of the posterior legs it is fulvous, the joints 

 themselves being rufo-piceous ; the claws of the tarsi black ; 

 the wings fuscous, darkest at their base ; the labrum and 

 clypeus yellow, and a yellow spot on the mandibles near their 

 apex ; the first segment of the abdomen black, sometimes the 

 base of the second also. 



Hah. Vera Cruz. 



20. Centris rufa. 

 Centris rufa, St.-Farg. Hym. ii. p. 163, 5 . 

 Hah. Santarem (Brazil). 



21. Centris ferruginea. 

 Centris ferruginea, St.-Farg. Hym. ii. p. 156, $ . 

 Hah. Para; Tapajos (Brazil). 



22. Centris plumipes. 



Centris plumipes, Smith, Cat. Hym. Ins. Apidce, ii. p. 373, $ S • 

 Hah. Tapajos (Brazil). 



23. Centris jlavifrons. 



Centris Jlavifrons, St.-Farg. Hym. ii. p. 152, $ . 



Anthophora Jlavifrons, Fab. Syst. Piez. p. 375, cf. In coll. Banks in 

 Brit. Mus. 



Hah. Ega, Santarem, &c. (Brazil). 



24. Centris {Xylocopa) moerens. 



Centris (Xylocopa) tnmrens, Perty, Del. Anim. Artie. Bras. p. 150, pi. 28. 

 fig. 11. 



Hah. Minas Geraes. 



This species is black, and has the two basal segments sul- 

 phur-yellow ; the wings dark fuscous. It is 14 lines long. 



