ART. 12 MKGACHIMD BEES FEOM BOLIVIA COCKERELL. 19 



MEGACHILE MICRODONTURA, new species 



Male. — Length, 7.3 mm. Black, slender, width of abdomen shghtly 

 over 2 mm.; mandibles, eyes, antennae, tegulae, and legs black; 

 eyes converging below; clypeiis convex, finely punctured, the lower 

 margin with a long dense creamy white fringe; cheeks broad, sharply 

 keeled behind, little hairy, except beneath, where there is abundant 

 long pure white hair; front completely dull, vertex shining, with 

 distinct punctures; top of head with some erect dark hairs; meso- 

 thorax shining in front, dull behind, minutely punctured; scutellum 

 finely punctured; metathorax obliquely sloping, shining; dors\im of 

 thorax anteriorly with yellowish pile, changeable in various lights, but 

 scutellum posteriorly with erect black hair; wings dusky, the middle 

 clear, stigma and nervures dark brown; anterior coxae unarmed, 

 anterior tarsi simple; tarsi vnth. white hair; abdomen rather long and 

 narrow, minutely granular, basin of first segment deep, pohshed, apex 

 of first segment v/ith pale fulvous hair, third and fourth segments 

 with tegument rufous at base; apex of fourth and fifth segments, and 

 whole of sixth, covered with golden pile; keel of sixth segment with 

 tv/o rather short sharp black teeth; venter with much creamy white 

 hair. 



Rurrenabaque, Bolivia, October (W. M. Mann). Described from 

 one male. Allied to M. microsoma Cockerell, but more slender, with 

 black tegulae. It is also allied to M. hertonii Schrottky to which it 

 runs in Schrottky's table, and 31. xantliura Spinola, to which it runs 

 in Friese's table. 



Type.—C2ii. No. 29087, U.S.N.M. 



MEGACHILE BENIENSIS, new species 



Male. — Length 8 mm. Rather broad, black, with light rose-red 

 eyes; face densely covered with long yellow hair; mandibles and 

 antennae black; flagellum long simple; cheeks with white hairs; 

 vertex shining, finely punctured, with long black hair; mesothorax 

 dull, extremely finely and closely punctured, scutellum about the 

 same; hair of thorax above thin, on mesothorax white and black, on 

 scutellum black, longer and denser; other parts of thorax with white 

 hair, and a conspicuous Vv^hite band in scutello-m.esothoracic suture; 

 tegulae extremely dark brown; wings hyaline, dusky at apex, nervures 

 and stigma brown; legs black, the anterior femora with a large red- 

 dish clay-colored patch on apical half within, extending also to lower 

 margin, and the hind tibiae with a pale reddish stripe on outer side; 

 hair of legs white, spurs pale; anterior coxae with long slender spines, 

 anterior tarsi simple; abdomen short, moderately shining, finely and 

 closely punctured; pale ochreous hair bands on segments 1 to 4, thin 

 or interrupted in middle ; on 1 developed only at sides; fifth segment 

 covered with creamy or pale ochreous hair, with small black hairs 



