11)2 HYMENOPTERA. 



nil ochrapeous hue ; the Icprs and a])ical segments of the ah- 

 ilonu'ii have a eovering of hhiek piil)escence ; the tarsi beneath 

 fulvous; the wings hyahne, faintly elonded at their apical mar- 

 gins. The brush on the abdomen beneath is of a blackish 

 browni. 



Male. — Has the general a))pearance of the female, its pubes- 

 cence is longer, that on tlie face being very dense and of a pale 

 yellow colour ; the apical joint of the antennae dilated and com- 

 pressed : the anterior legs ])ale testaceous ; the apex of the 

 femora and the tibiic above black, the tarsi dilated and fringed 

 beneath with pale hairs ; the intermediate tarsi have a yellow 

 pubescence above, and are, as well as the posterior pair, fulvous 

 beneath, their claws ferruginous ; the apical segment deeply 

 notched, and on each side denticulate ; beneath the abdomen on 

 the ventral segment are two obtuse spines, and a little before 

 them a central acute one. 

 Hah. Nova Scotia (Lieut. Redman). Hudson's Bay (G. Bani- 



ston, Esq.). North America (E. Doubleday, Esq.) 



148. Megachile acuta, n. s. B.Y 



Female. Length 6 lines. — Black, the entire pubescence abovt 

 of a ])ale yellow, in some specimens fading to grey ; the legs 

 have a short ])ubeseence of the same colour, beneath the tarsi it 

 is fulvous ; wings hyaline, faintly clouded at their apical margins. 

 Abdomen gradually tapering from the base to the apex ; the 

 base deeply emarginate, the second, third and fourth segments 

 have a transverse arched depression ; beneath, the pollen-brush 

 bright fidvous. 



Hab. North America ; Trenton Falls; New York (E. Doubleday, 

 Esq.) ; Mexico. 



149. Megachile vidua, n. s. B.M. 



Megachile maritima, Kirby, Faun. Boreal. Amer. p. 270. 1, ex- 

 clus. synon. ? 



Female. Length fi lines. — Black, the face covered with pale 

 ochraceous pubescence, brightest towards the margin of the cly- 

 peus, on the vertex and disk of the thorax it is dark fuscous, on 

 the sides of the thorax, beneath, on the legs above and at the 

 sides of the basal segment of the abdomen it is of a very pale 

 yellow, being nearly white at the sides of the metathorax, and 

 short and sjjaring on the legs ; wings subhyaline, ihe apical mar- 

 gins faintly clouded ; the tarsi fulvous beneath, on the anterior 

 and intermediate paiis it is of a bright golden-yellow above, the 



