400 Mr. T. D. A. Cockerell on new Hymenoptera 



grey, tinged with ochraceous on the metathorax, white on 

 the face and underside of body. Clypeus except its lower 

 margin, labrum except its lower margin, and lateral face- 

 marks primrose-yellow. Lateral marks triangular, rapidly 

 narrowing above on orbital margin. Anterior edge of labr'irn 

 with a small round notch. Pubescence of face dense. Man- 

 dibles wholly black, with a large denticle on the inner side. 

 Antennas black, scape chrome-yellow in front, first joint of 

 flagelkim very long. Eyes olive-green. Thorax densely 

 pubescent, scattered black hairs mixed with the pale ones, as 

 is also the case on vertex. Tibiae and tarsi grey pubescent 

 on outer side ; hind femora with long hairs, black and white 

 intermixed. Last joint of middle tarsus with a very broad 

 brush of black hairs on each side, the outline of the two 

 brushes together making about a circle. Claws rufous, with 

 black ends, deeply cleft. Tegulfe piceous ; wings hyaline, 

 marginal cell appendiculate. Abdomen with the first segment 

 densely pubescent, the others with only short bristles, which 

 do not conceal the surface. Hind margins of second and 

 following segments narrowly testaceous. Apex truncate, 

 very broadly and shallowly emarginate. Ventral segments 

 with thin bands of white hairs. 



Hob. Little Mountain, Mesilla Valley, N. M., three on 

 flowers of Lesquerella Fendleriy April 1, 1895 [Jessie Casad) ; 

 College Farm, Mesilla Valley, one on Lycium^ April 16, 

 1895 [Jessie Casad). 



Of the species found in the Mesilla Valley this most 

 resembles A. [P.) urbana, Cr., which I have taken on Solarium 

 at Las Cruces, July 13, the specimen having been determined 

 by Mr. Fox. It is distinguished at once from urbana^ how- 

 ever, by the black brush on the middle tarsi. It agrees with 

 nothing in Dours's monograph, but is evidently close to 

 Aiithophora Crotchii, Cresson, from which it differs bj its 

 dark mandibles, colour of pubescence, &c. 



Alcidamea biscutellct^ sp. n. 



^ . — Length about 13 millim. 



Rather stoutly built ; in size, colour, pubescence, and 

 general appearance much like Andrena electrina, which 

 occurs in tlie same vicinity. Black, pubescent, the pubes- 

 cence white, becoming mouse-grey on dorsum. Head some- 

 what broader than long, face covered with long silky white 

 hairs, which radiate from the centre ; vertex sparsely hairy 

 in middle, bare at sides, shining, strongly punctured ; man- 

 dibles black ; antennas black, scape gradually broadening to 



