362 Mr. F. Smith on the Genus Centris. 



25. Centris [Xylocopa) xanthocnemis. 



Centris {Xylocopa) xanthoctieynis, Perty, Del. Anim. Artie. Bras. p. 150, 

 pi, 28. fig. 12. 



This insect is black ; the pubescence on the thorax is 

 yellow anteriorly and black posteriorly ; the abdomen densely 

 covered with olivaceous pubescence ; wings of an iridescent 

 blue ; the posterior tibia3 and tarsi densely clothed with ferru- 

 ginous pubescence. Length 11| lines. 



Ilab. The province of Piauhi. 



*26. Centris personata. 



Male. Length 10 lines. Head and thorax black ; abdomen 

 ferruginous. The cheeks have a fine short white pubescence 

 at the margins of the eyes, and a longer pale fulvous pubes- 

 cence beyond. The pubescence on the thorax is sooty black 

 above ; beneath it is more or less tinged with fulvous ; the 

 prothorax has a little white pubescence on each side anteriorly, 

 close to the head ; the tarsi rufo-piceous, with the claws black j 

 wings fusco-hyaline, the nervures fusco-ferruginous ; the pos- 

 terior legs with black pubescence. The abdomen with fulvous 

 pubescence ; at the apex, and also beneath, it is dense and 

 bright. The clypeus and labrum reddish yellow ; the front of 

 the scape of the antennaj and the mandibles yellow, the latter 

 have a black space a little before their apex ; the clypeus has 

 a large black spot at its base divided in the centre by a nar- 

 row yellow line ; the labrum covered with short fulvous 

 pubescence. 



Hab. Tapajos, Ega (Brazil). 



*27. Centris ignita. 



Black, with the apex of the abdomen ferruginous. The 

 head and thorax with black pubescence, that on the posterior 

 tibige and first joint of the tarsi fulvous outside and ferruginous 

 within, the joints are also feiTUginous ; the mandibles with a 

 yellow spot near their apex ; the wings dark fuscous, with a 

 purple iridescence. Abdomen shining : the basal segment 

 naked ; the other segments have a thin sericeous hoary pile, 

 which is observable in certain lights ; the apical margin of the 

 third segment ferruginous, the fascia is widest in the middle 

 and at the sides of the abdomen ; the fourth and following 

 segments entirely ferruginous ; beneath ferruginous, with more 

 or less of fuscous spots or bands at the basal margins of the 

 segments. 



Hah. Orizaba (Mexico). 



