HYMENOPTERA FROM LOWER CALIFORNIA. II 7 



pubescence on thorax is grayish. Both species are from 

 San Jose del Cabo. 



Megachile occidentalis n. sp. 



3 . — Black; flagellum beneath, teguUe, apex of femora, 

 apical half of tibice, and the tarsi entirely, reddish; some- 

 times the ventral segments of abdomen are more or less 

 reddish; head in front densely clothed with long whitish 

 pubescence, which becomes sparse on the vertex, where 

 it is mixed with fuscous ; vertex with tolerably strong, 

 even, separated punctures, those on the front closer; 

 clypeus strongly punctured, sparsely so medially, the an- 

 terior margin with a wide, medial emargination, on each 

 side of which it is strongly produced; mandibles very 

 broad and coarsely sculptured, and on outer margin near 

 the apex drawn out into a triangular lobe, which is fringed 

 with golden pubescence ; antennae rather long and slender, 

 the last joint elongate-spatulate, and is decidedly longer 

 than the preceding joint, second joint of flagellum nearly 

 twice as long as the first; thorax clothed with whitish 

 pubescence, densest beneath; dorsulum rather strongly 

 and closely punctured, the punctures are, however, not 

 confluent, and has two short, longitudinally parallel, 

 patches of white hair basally, and another on its posterior 

 portion, near the tegulas; scutellum with the punctures 

 somewhat stronger and sparser than those of the dorsu- 

 lum, not impressed; anterior coxa? armed with a blunt, 

 stout projection or tooth: the fore tarsi with the two basal 

 joints dilated and within with a thick fringe of pure white 

 pubescence ; all the tarsi within are clothed with golden 

 pubescence, particularly the hind pair, the other pubes- 

 cence of legs colored like the thorax; wings subhvaline, 

 slightly darker apically ; abdomen above punctured about 

 like the scutellum, except on fifth dorsal segment, and 

 with a white band of hairs at apex of segments 1-4 and 



