12 Prof. T. D. A. Cockerell on 



portion of the abdomen curved downwards as in that species ; 

 but the two are closely allied. 



Las Vegas Hot Springs, Aug. 10, at flowers of Senecio 

 Douglasii, two ( W. Porter) ; Las Vegas, July 22, at flowers 

 of Rudbeckia laciniata ( W. Porter} ; Aug. 9, at flowers of 

 Melilotus alba (W. Porter) ; Aug. 12 (A. Oarlick). 



Megachile Townsendiana, Ckll., 1898. 



Las Cruces, Aug. 23, 4 <$ {Ckll. & Townsend) ; Rincon, 

 July 6, at flowers of Actinella, 2 <$ (Ckll.). 

 A species of the Middle Sonoran zone. 



Megachile pollicaris, Say, var. pereximia nov. 



£ . — Length 13 millim. 



Anterior and middle femora and tibiae ferruginous ; hind 

 femora and tibiae black ; middle tibiae with a black basal 

 streak behind ; anterior tibiae yellow in front at apex ; second 

 joint of anterior tarsus white, with a long linear apical 

 process ; apex of flagellum somewhat dilated. 



Hab. Beulah, May 30, at flowers of wild plum [W. 

 Porter) . 



Megachile Casadce, Ckll., 1898. 



Found as yet only in the Mesilla Valley. 



The female has the scopa entirely white ; clypeus and 

 mandibles normal ; punctures of mesothorax large, the 

 intervals between them shining, and presenting some ex- 

 tremely minute punctures. 



Megachile soledadensis , sp. n. 



<$ . — Length 10 millim. 



Agreeing with the description of M. legalts, Cress., but 

 possessing the following peculiarities : — Eyes pale green ; 

 apical joint of flagellum broad and flattened ; anterior coxae 

 with a bright ferruginous hair-patch, their spines short, 

 oblique, pointed, and slightly curved ; anterior femora with 

 the basal two fifths above pale ferruginous, beneath with a 

 large yellowish keel, subtriangular in shape, like that of a 

 racing-yacht ; anterior tibiae three-sided, ferruginous, except 

 on the outer side ; anterior tarsi yellow, moderately dilated, 

 with a long white fringe, which is brownish within, second 

 joint with a conspicuous black spot within ; hind tibiae stout, 

 their tarsi broadened ; hair of vertex and thoracic dorsum 



