20 PKOCEEDINGS OF THE NATIONAL MUSEUM vol. 71 



interspersed; sixth densely covered with ochreous hair; keel of sixth 

 segment produced, broadly emarginate, with two salient angles; venter 

 black. 



Hiiachi, Beni, Bolivia, September (W. M. Mann). Described from 

 one male. In Schrottky's key rims to M. {demticulata Smith) hrasili- 

 ensis Dalla Torre, but is not that species, which is also in the collec- 

 tion. 



Type.— C&t. No. 29088, U.S.N.M. 



MEGACHILE LEUCOSTOMELLA, new species 



Male. — Length about 7 mm. Black, broad, the wings dusky (not 

 at all orange), becoming dark fuliginous in costal region, including 

 marginal cell; clypeus convex, polished, with well-separated punc- 

 tures, bare, the lower margin with a long pure white fringe; cheeks 

 with a sharp elevated margin posteriorly; a large tuft of pure white 

 hair behind each mandible; mandibles, antennae, and tegulae black; 

 vertex dull and very densely punctured, more sparsely at sides; meso- 

 thorax dull, with silky pale ochreous hair, changeable in different 

 lights; anterior coxae without spines; anterior femora with a red- 

 dish clay stripe on inner face; anterior tarsi simple; the tarsi out- 

 wardly hoary with white hair; abdomen dull (except polished basin 

 of first segment), the hind margins of segments more shining; hind 

 margin of third segment with rudiment of ochreous band at each 

 extreme side, fourth with a very thin hardly evident band, fifth with 

 a distinct narrow band, sixth densely covered with ochreous hair; 

 keel of sixth emarginate, with two salient rather obtuse angles; 

 venter with four conspicious broad hair bands, the first white and 

 not reaching sides, the others pale yellowish, extending right across. 



Huachi, Beni, Bolivia, September (W. M. Mann) . Described from 

 three males. Closely related to M. hertonii Schrottky, but that has 

 a broader face, fringe on clypeus not white, tegulae largely red, etc. 



Type.— Cat. No. 29089, U.S.N.M. 



Two paratypes in collection of author. 



MEGACHILE SEJUNCTA, new species 



3[ale. — Length about 9.5 mm., anterior wing 7.5 mm. Black, 

 rather robust, with short abdomen; mandibles, legs, and the long 

 antennae black, but tegulae shining ferruginous; sides of face, supra- 

 clypeal region, and most of front covered with long pale yellowish 

 hair and lower part of clypeus with a long dense fringe of the same; 

 the rest of clypeus bare, with thin overlapping hairs, densely punc- 

 tured at sides, but with a median broad, smooth, and polished band; 

 cheeks beneath with dull white hair; vertex well punctured but 

 shining, some black hair about the ocelli; meso thorax polished, with 

 well-separated punctures; scutellum convex, shining; mesopleura 



