Bees of the Genus Megachile. 127 



black patch, on inner edge with a black stripe, apex with a 

 small dentiform projection ; anterior tarsi cream-colour, some- 

 what suffused with pale ferruginous, the last joint pale 

 ferruginous; first joint deeply hollowed, but not very broad, 

 not much produced at end, the margins of the hollow fringed 

 with dark rufous hair^ the hind margin with the usual long 

 pale fringe, the inner hairs of wliich are black at ends ; second 

 to fourth joints of anterior tarsi successively smaller, almost 

 bilaterally symmetrical ; abdomen loith very distinct punctures, 

 broad and short, the lateral margins gently concave, clothed 

 with erect yellowish hair, not concealing the surface, not 

 mixed with black, not at all tending to form bands ; apex 

 with a small emargination, on each side of which are two or 

 three irregular teeth ; apical ventral segment obtusely angled 

 in the middle, with a small tooth on each side. 



Hab. Colorado Springs, Colorado, middle of July {Gkll. 

 3571). At the same locality and time [ took a form of 

 M. fidelis, Cress., a little different from specimens found in 

 New Mexico. 



Megachile Casadce, sp. n 



c?. — Length about 13^ millim. 



Black, with dull white pubescence. Head ordinary, but 

 rather large ; eyes sage-green ; facial quadrangle nearly 

 square, slightly longer than broad, hardly at all narrowed 

 below ; face with white hair, absent about the middle of the 

 shining well-punctured clypeus ; vertex shining, with large 

 punctures, thinly pubescent, some black hairs just beliind the 

 ocelli ; cheeks quite hairy, sloping away behind eyes ; an- 

 tennte black (broken at ends in type specimen) ; mandibles 

 wholly black, no tooth or tubercle behind their base ; meso- 

 thorax dullish, strongly and closely punctured, thinly clothed 

 with dull white pubescence, some inconspicuous black hairs 

 on hinder part ; scutellum quite shiny ; tegula3 piceous, with 

 minute punctures ; wings dusky hyaline, nervures black, 

 recurrent nervures entering second submarginal cell very near 

 its base and apex ; anterior coxas with a rather short spine, 

 having a light yellowish patch at apex ; anterior femora 

 orange-rufous above and below, black behind, with long white 

 hair, and having a broad black stripe from base to apex in 

 front; anterior tibias orange-fulvous beneath and at apex, 

 also the anterior half (longitudinally) within, otherwise black ; 

 a small erect spine at apex ; anterior tarsi light yellow, the 

 last joint blackish except at base ; the joints are not much 

 modified, but the second to fourth are oblique, emarginate at 

 end ; the first has a rather shallow groove, and all are black 



10* 



