Mr. F. Smith on the Genus Centris. 359 



long. It is black, with the pubescence on the head black, 

 that on the thorax a mixture of very short black and griseous, 

 with a tuft of pale fulvous pubescence on each side of the 

 metathorax; the first segment of the abdomen naked, the 

 second and following segments covered with very fine, short, 

 griseo-fulvous pubescence ; the second segment more or less 

 naked at the base and in the middle ; the posterior legs densely 

 clothed with ferruginous pubescence; wings dark fuscous, 

 with a violet iridescence. 



5. Centris derasa. 

 Centris derasa, St.-Farg. Hym. ii. p. 150, pi. xx. fig. 2, $ , 

 Hah. Cayenne. 



6. Centris emarginata. 

 Centris emarginata, St.-Farg, Hym. ii. p. 157, $ (C derasa, var. ?). 

 Hob. Cayenne. 



7. Centris americanorum. 



Ptilotopus aniericanortim, Klug, Berl. ]\Iag. p. 32, tab. i. fig. 1, $ (1810). 

 Centris Langsdorjii, Blanch. Hist. Nat. des Ins. iii. p. 405, tab. vii. 



fig. 7,2(1840). 



Hob. Brazil (Tapajos and Para) . 



8. Centris decorata. 



Centris decorata, Smith, Cat. Hym. Ins. Ajridee, ii. p. 372, c? . 



Hah. Pemambuco. 



This species closely resembles C. americanorum^ of which it 

 may possibly be a local variety, — the differences being that 

 the thorax in C. decorata is clothed with bright yellow 

 pubescence, the sides of the basal segment of the abdomen 

 have a pale yellow, and the second, third, and fourth segments 

 arc covered with olive-green pubescence ; in C. americanorum 

 the thorax is clothed with fulvous, and only the second and 

 third segments have a covering of olive pubescence. Both 

 examples described are in fine condition. 



9. Centris insignis. 



Centris insignis, Smith, Cat. Hym. Ins. Apida, ii. p. 375, 2 • 

 Hah. Columbia. 



10. Centris festiva. 



Centris festiva. Smith, Cat. Hym. Ins. Apidce, ii. p. 375, J. 

 Hah. Columbia. 



