264 E. T. CRESSON. 



joints small, scarcely dilated, terminal joint long, narrowed towards base, 

 claws cleft and black at tip; posterior tibise tinged with reddish outwardly, 

 their tarsi pale yellowish-white, first joint as long as remaining joint combined, 

 of equal width, smooth and shining, fringed on both sides with long pale hairs, 

 remaining joints small, strongly lobed at tip, claws tipped with black; abdo- 

 men subquadrate, nearly as wide as thorax, first segment broadly and deeply 

 excavated at base and fringed laterally and posteriorly with long pale yellow- 

 ish hairs, three following segments with a narrow apical fringe of pale ochra- 

 ceous pubescence, base of fourth and fifth segments with a band of dense pale 

 ochraceous pile, the apical segment covered with a very dense whitish pile, 

 apical margin emarginate centrally, not deeply so. Length .50 inch. 



Two specimens. (Belfrage.) Easily recognized by the whitish 

 tarsi and by the remarkable form of the intermediate pair. 



Megachile pollicaris. 



Megachih pollicaris, Say, Bost. Journ. Nat. Hist, i., p. 406. 

 Nine % specimens. (Belfrage ; Boll.) This may not be the true 

 pol/icoris, as Say says nothing about the long, prominent, yellow 

 scale-like process, tipped with honey-yellow, at base of anterior tarsi, 

 and of the intermediate legs being red ; otherwise the insects accords 

 well with the description given by Say. 



Megachile pugnata. 



Megachile pugnatus, Say, Bost. Journ. Nat. Hist, i., p. 408. 

 Four % $ specimens. (Belfrage.) 



Megachile disparilis, n. sp. 



% . — Black; face and clypeus clothed with a long, dense whitish pubes- 

 cence, slightly tinged with yellowish, vertex and cheeks with long, thin, white 

 pubescence, slightly mixed with short black pubescence behind ocelli; head 

 large, as broad as thorax, densely and finely punctured; antennae black, the 

 terminal joint compressed and slightly dilated; thorax closely punctured, 

 clothed with a long, not dense, cinereous pubescence, longer on metathorax 

 and pleura and slightly mixed with black pubescence on mesothorax; tegulas 

 dull piceous, pubescent; wings subhyaline, dusky on apical margin; legs 

 black, with short yellowish pubescence, that on coxae and femora beneath long 

 and white; anterior coxse with a long, subacute blackish spine, before which 

 is a much shorter, slender, acute reddish double spine, their femora within 

 and their tibise at tips tinged with honey-yellow, their tarsi whitish, broadly 

 dilated, with a long dense fringe of white pubescence tipped with yellowish 

 posteriorly, first joint with a long pale yellow scale like process anteriorly, 

 hollow within, the tip of which extends beyond tip of second joint, the tip of 

 which is also prolonged nearly to tip of third joint, posterior margin of the 

 joints narrowly black, the apical angles acute, fourth joint small, scarcely 

 dilated, last joint slender, claws cleft and tipped with black; four posterior 

 tarsi simple, densely clothed with yellowish hair, tips more or less tinged with 

 ferruginous; abdomen rather broader than thorax, sides subparallel, shining, 

 minutely punctured, clothed with very short black pubescence, apical margins 

 fringed with a short white pubescence, first segment deeply excavated at base, 



