8 Prof. T. D. A. Cockerell on 



the second segment ; vertex, mesothorax, and scutellum with 

 erect black hair; basal portions of second and following 

 abdominal segments with short black hair ; labrum with 

 erect pale orange hair ; hair on inner side of tarsi more or 

 less orange or reddish, on hind tarsi deep orange-ferruginous ; 

 ventral scopa entirely very pale yellowish to yellowish white, 

 never quite a pure white ; spurs bright ferruginous ; antennas 

 wholly black, reaching about to tegulse ; clypeus shining, 

 with strong punctures, sparse in the middle, its anterior 

 margin with four short teeth ; head large, subquadrate ; 

 cheeks simple ; vertex broad, with strong punctures, dense in 

 the middle, where they are of two sizes ; mandibles broad, 

 4-dentate, not counting the inner angle ; mesothorax densely 

 punctured at the sides, more sparsely in the middle ; tegulaa 

 black, microscopically sculptured, punctured anteriorly ; 

 wings smoky; claws with a ferruginous denticle at the base. 



Allied to M. bucephala, Smith, but considerably larger. 



Bab. Beulah, Sapello Cafion, N. M., July 26, 2 ? , one 

 at flowers of thistle (W. Porter); Beulah, Aug. 18, 2 ? 

 {CklL); hill west of Beulah, Aug. 23, 1 ? {W.Porter); 

 Harvey's Ranch, 9600 feet, Aug. 22, 4 ? (Porter & CM.) ; 

 South Fork, Eagle Creek, White Mts., about 8100 feet, at 

 flowers of Senecio Bigelovii, Aug. 13, 1 <j> (Townsend). 



Greene, ' Pittonia,' iv. p. 118, announces that the plant of 

 the White Mts., distributed as Senecio Rushy i, is really 

 S. Bigelovii. It is visited also by Bombus improhus and 

 Andrena apacheorum. 



Megachile pugnata, Say, 1837. 



Santa Fe', 5 $ , 2 ? ; Las Vegas, July 22, at flowers of 

 Rudbeckia laciniata,l ? (W.Porter); Beulah, July 26, 3 ? 

 (W. Porter) ; hill near Beulah, Aug. 19, 2 ? (W. Porter). 



The female is easily distinguished from the last by its 

 smaller size (not over 15 millim.) and the large tooth at the 

 lower hind angles of the cheeks. The abdominal bands are 

 entire. 



The Santa Fe males were at flowers of Lactuca pulchella 

 and Rudbeckia,) the females at Lactuca pulchella and 

 Grindelia. 



Megachile fidelis. Cress., 1878. 



Las Vegas Hot Springs, at flowers of Senecio Douglasii, 

 Aug. 10, 3 $ (W. Porter) ; Burnt Canon, Aug. 14, at flowers 

 of Cleome, 1 ? (Sarah L. Mize) ; Las Vegas, July 6 and 



