216 PROCEEDINGS OF THE NATIONAL MUSEUM. voi-. 55. 



tarsi black, but very remarkable, the first two joints broadly ex- 

 panded and quadrate, densely covered with pure white hair on outer 

 side, third joint with a large rounded lateral expansion, but only the 

 other part of the joint covered with white hair; middle tarsi curved, 

 densely covered with silky hair, yellowish on inner side; hind tarsi 

 with a glittering white fringe of hair anteriorly; abdomen shining, 

 well punctured, apical margins of first three segments with fulvous 

 hair bands, failing in middle, but reinforced by fulvous hair at ex- 

 treme bases of segments following; segments 4 to G denselj^ covered 

 with bright reddish fulvous hair; keel of sixth segment with two 

 large rounded lobes. 



Cordoba, Mexico, Dec. 20, 1907 (F. Knab). Related to 31. occi- 

 dentalis Fox, but easily separated by the peculiar anterior tarsi, 

 which are not elongated, and the fulvous hair on abdomen. 



Type.— C^t. No. 21685, U.S.N.M. 



MEGACHILE HOWARDI, new species. 



Male (type). — Length 10 to 11 mm.; anterior wing 7.7; black, par- 

 allel-sided; antennae black, not modified; legs black, with the ante- 

 rior tarsi clear pale yellow, with pure white hair on outer side ; first 

 joint of anterior tarsi hollowed, boat-shaped, the orange-tinted apex 

 not reaching end of second joint, the inner margin fringed with 

 black hair; second and third joints broadened, the whole tarsus with 

 a large posterior hair fringe, which is tipped with ferruginous, while 

 on the inner surface of the tarsus are two dark spots. Face densely 

 covered with pure white hair, a few brown ones from upper edge of 

 clypeus ; vertex with hair partly brown, but rest of head with white 

 hair; surface of vertex, mesothorax, and scutellum dull, impunctate: 

 hair of thorax wholly white; tegulae dark brown; wings hyaline, 

 with a brown cloud beyond marginal cell; anterior coxae with very 

 long spines, from the outer side of which are very long hairs, stand- 

 ing at right angles to spine; middle tarsi with a fringe of very long 

 white hair behind ; abdomen shining black, with narrow entire pure 

 white hair bands on segments 2 to 5 ; disk of fifth segment with 

 abundant black or dark brown hair; keel of sixth segment variably 

 emarginate, the very broad rounded lobes more or less jagged. 



FeTnale. — Similar, except for the usual sexual differences, the 

 vertex distinctly punctured, the scutello-mesothoracic suture with a 

 line of white hair (wholly lacking in male), the clypeus beset with 

 long stiff black hair. The hind basitarsi are hardly broadened ; the 

 ventral scopa is white (carrying orange pollen), black at tip of last 

 segment. 



San Jose de Guaymas, Mexico. April 10 (L. O, Howard). The 

 female, which is possibly a different species, nearly agrees with the 

 description of M. zaptlana Cresson, but it is smaller and has no black 



