AMERICAN HYMENOPTERA. 209 



dense and white, that on sides of pleura mixed with black; last joint of 

 antennae dilated and flattened; anterior tibije yellow at tip, their tarsi whitish, 

 not much dilated, and fringed beneath with white pubescence, tipped with 

 black, the basal joint grooved on upper edge, the coxse toothed, the four pos- 

 terior legs clothed with black pubescence, that on middle tarsi beneath long 

 and mixed with whitish ; abdomen shining, clothed with black pubescence, 

 that on sides of first segment, and narrow apical margin of segments 2 — 4 

 white, sixth segment acute at tip, the sides crenulated. Length .36 inch. 

 Hab. — Nevada, (Morrison). Two specimens. 



Megachile legalis.— '^. — Black, opaque, subparallel, clothed with a 

 dense white pubescence, most dense on face, sides of thorax, seutellum and 

 anterior legs beneath; tegulse dull testaceous; wings clear; anterior femora 

 and tibiae beneath and their tarsi yellow, the latter slightly dilated, anterior 

 coxse with two strong spines, four posterior legs thickened, but simple; ab- 

 domen with parallel sides, rather strongly punctured, sides of first segment 

 and narrow apical margin of segments 1—5, clothed with whitish pubescence, 

 sixth segment obtusely pointed at tip, faintly crenulated, and produced or 

 prominently carinate on each side beneath. Length .40 — .45 inch. 

 Hah. — Nevada, (Morrison). Three specimens. 



Hegacliile nevadensis. — 9. — Black; head and thorax densely and 

 confluently punctured, clothed with a short, dense ochraeeous pubescence, 

 sometimes more or less tinged with yellow or pale fulvous, that on vertex and 

 mesothorax sparse and strongly mixed with black; wings dusky on apical 

 margin; abdomen shining, clothed with sparse black pubescence, the first 

 segment especially at sides and the apical margin and sides of segments 2 — 5 

 densely clothed with a yellow or ochraeeous pubescence, apical segment pale 

 sericeous; ventral scopa ochraeeous, more or less black at extreme i\'^. Length 

 .45 — .55 inch. 



'^ . — Form parallel, the pubescence longer, much more dense and generally 

 strongly tinged with fulvous, that on vertex and thorax not mixed with black, 

 that on the face very dense and golden; last joint of antennae dilated and 

 flattened; anterior femora yellowish above, fringed at base beneath with long 

 white pubescence, their tarsi whitish, not much dilated, grooved above at 

 base and fringed beneath with white pubescence edged with black, their coxse 

 toothed; middle femora swollen, their tarsi beneath with a long fringe of 

 white pubescence; posterior legs incrassate, their coxae and femora with long 

 white pubescence, their tarsi with thickened joints and pubescent beneath; 

 abdomen convex, with subparallel sides, the basal segments clothed with 

 short dense erect ochraeeous, yellow or fulvous pubescence, that on the apical 

 segments more or less mixed with black, the apical margin of the segments 

 with a short dense fringe of ochraeeous pubescence; apical margin of sixth 

 segment with numerous very unequal teeth; the tip beneath with a cential 

 spine. Length .45 — .55 inch. 



Hah. — Nevada, (Morrison). Numerous specimens. 



Melissodes nevadensis.— 'J,.— Black; head, thorax, legs and base of 

 abdomen clothed with a long dense pale ochraeeous pubescence; clypeus 

 entirely and labrum yellowish-white; antennae reaching back to tip of second 

 abdominal segment, entirely black, third joint as long as first and second 



TRANS. AMER. ENT. SOC. VII. (27) FEBRUARY, 1879. 



