HYMENOPTERA. 191 



covered with a short pubescence of the same colour ; the margin 

 of the sixth segment armed with two stout teeth. 



Obs. This species was received in company with M. acuta, of 

 which it is probably the male. 

 Hab. Mexico. 



145. MEGACHILE SCROBICULATA, n. s. 



Male. Length 4^ lines. Black, the clypeus covered with 

 white pubescence, above which it is griseous and very sparing 

 on the vertex ; the mandibles have a short white fringe beneath, 

 at their base is a stout spine, the cheeks fringed with white ; 

 the pubescence on the thorax griseous, very sparing on the disk ; 

 the anterior legs have their tibiae pale testaceous in front, their 

 femora slightly so, then* tarsi dilated, the first joint at its apex 

 produced into a projecting lobe, rounded at its apex ; this lobe is 

 grooved or hollowed out in front ; the tarsi beneath clothed 

 with pale yellow hairs, the coxae armed with long spines ; the 

 intermediate and posterior tarsi rufo-testaceous ; the wings sub- 

 hyaline, their nervures ferruginous ; the apical margins of the 

 segments have narrow white marginal fasciae, the apical segment 

 slightly notched in the middle and subserrate on each side. 

 Hab. North America ; Mount Pleasant, Ohio. 



146. MEGACHILE PARALLELA, n. s. 



Male. Length 5^ lines. Black, the clypeus and cheeks 

 densely covered with white pubescence, on the upper part of the 

 face and on the disk of the thorax it is slightly ochraceous ; on 

 the sides, beneath, and on the legs it is white, the anterior femora 

 are thickly fringed ; wings fusco-hyaline, their nervures black ; 

 the margins of all the segments and the sides of the basal one 

 fringed with white pubescence ; the base deeply emarginate ; the 

 margin of the apical segment has a central rounded incision, form- 

 ing two incurving teeth ; beneath, the margin of the venter has 

 on each side two short teeth, directed inwards, between the inner 

 ones a raised prominence. 



Obs. This species is distinguished by its broad parallel form, 

 the abdomen, head and thorax being of the same width. 

 Hab. Georgia. (Coll. F. Smith.) 



14/. MEGACHILE MELANOPH^EA, n. s. B.M. 



Female. Length 6 lines. Black, the face, thorax above and 

 on the sides, and the two basal segments of the abdomen co- 

 vered with ashy-grey pubescence; in recent specimens it has 



