286 Mr. T. D. A. Cockerell on new Bees 



covered with very large close pits or punctures. First joint 

 of anterior tarsi broad, flat, thin, convex without, concave 

 within, narrowest at base, not produced at apex, without 

 shining, sparsely clothed with short white hairs ; hind margin 

 fringed with long silky dull white hairs, black only at extreme 

 tips, anterior margin within with a short brush of black hairs; 

 inner concave surface black, with white specks. Second to 

 fourth joints of anterior tarsi successively smaller, fringed on 

 hind margin like the first ; second with a black spot on inner 

 surface. Median tarsi with the first joint broadly dilated, 

 pyriform, with a dense oblique fringe of silky yellowish- 

 white hairs on outer side, and at base within a deep pit to 

 adn)it an angular projection of the tibia. Basal joint of hind 

 tarsi somewhat flattened. Abdomen short and broad, rather 

 shining, closely punctured, apical margins of the segments 

 with narrow fringes of pale ochreous haiis. Fifth segment 

 at base and apex largely covered with appressed pale pubes- 

 cence. Apex emarginate, not very deeply. Base of venter 

 with a strong keel. 



San Rafael, June 18 ; one, on plant no. 29. 



Superficially this is much like the male of M. Candida, 

 Smith, which Prof, 'i^ownsend took at Paso de Telaya on 

 April 8. The following table at once separates them : — 



M. Candida S • M. vercecrucis S - 



Hairs of fringe of tirst joint of These hairs black only at ex- 

 anterior tarsi largely black at ends- treme tips. 



First joint of anterior tarsi not 

 so broad. 



First joint of middle tarsi slen- First joint of middle tarsi pyri- 



der, ordinary. form. 



First joint of hind tarsi a little First joint of hind tarsi distinctly 



shorter than the three following Innger than the three following 



joints together. joints together. 



Spines on anterior coxae longer 

 and more slender. 



Tegute rufo-piceous. Tegulae ferruginous. 



Second submarginal cell higher. Second submarginal cell very 



low. 



(4) Megachile perpu7icfata, sp. n. 



$ . Length about llmillim. Black throughout, including 

 antennse, mandibles, and legs. Shape of a Coelioxys. Face 

 strongly and closely punctured ; clypeus with a median 

 smooth line, its median apex trituberculate, with a few dark 

 rufo-fulvous hairs. Pubescence of face and vertex sparse 

 and black, mixed with white in front, and a broad band of 

 white hairs in front of each eye. Cheeks with white pubes- 



