1912] Cockerell — New Bees from Brazil S^5 



1. Hair around base of antennae bright rufofulvous constructrix Sm. 



Hair around base of antennae not brightly colored 2 



2. Length 9-10 mm.; hair of face mainly black schrottkyi Vachal 



Length lO^-lS mm.; hair of face as much pale as black lenticula Vachal. 



Megachile virescens sp. nov. 



Female. Length about 12 mm.; black, the tarsi dark brown, the dorsum of abdo- 

 men with variable, sometimes very conspicuous, green tints, with also sugges- 

 tions of dark purple; hair of head and thorax white, the dense bands in front and 

 behind the scutellum, the dense tuft behind the tegulae, and to some extent the 

 hair of upper part of sides of thorax, creamy-tinted; vertex with short black hair; 

 hair of legs white, orange-ferruginous on inner side of tarsi; abdomen with moderately 

 broad, entire creamy- white hair-bands at the apices of the segments; sixth segment 

 with appressed gray hair; ventral scopa yellowish- white, black on last segment; 

 mandibles quadridentate, black, with an obscure reddish subapical band; clypeus 

 and supraclypeal area shining, strongly punctured, the punctures sparse in middle, 

 antennae black; area between the ocelli with large well separated punctures, but that 

 on either side of them densely and minutely punctured, in complete contrast; 

 mesothorax with the anterior half dull, the posterior half shining, with fine punctures 

 of various sizes, but none large; scutellum posteriorly with black hair; tegulae 

 piceous, finely punctured; wings strongly dusky, posterior basitarsi broad and flat; 

 abdomen of the triangular type. 



Hab. — Baixa Verde, Rio Grande do Norte, Brazil (Mann). 

 Extraordinarily like M. deceptrix Sm. from S. Domingo (West 

 Indies), but the flagellum in Smith's species is fulvous beneath. 

 It is also very close to 31. chrysophila Ckll., from Mexico, but 

 that has a denselj^ granular abdomen, without green tints. 



Megachile microsoma sp. nov. 



Male. Length about 65 mm.; black, the anterior tibiae slightly reddish in 

 front, the hind tibiae distinctly reddish on inner side toward apex; head very large, 

 as large as thorax, abdomen short; hair of head and thorax above scanty, partly 

 black and partly pale yellowish (the latter easily overlooked) ; front and area just 

 below the antennae with black hair, but pale hair at sides of face, and lower margin 

 of clypeus densely covered with silky white hair; cheeks below with long white hair; 

 under side of thorax with dense white hair; basal part of abdomen with short black 

 hair, but sides of third segment at apex, a broad entire apical band on fourth, all of 

 fifth (densely only at apex), and all of sixth very densely, covered with pale fulvous 

 hair; hair of legs scanty and white, fulvous on inner side of tarsi; clypeus shining, 

 with large strong punctures, which are very sparse in middle; supraclypeal area 

 entirely dull, densely gi-anular; antennae long, entirely black; mesothorax finely 

 and closely punctured; tegulae rufopiceous, very dark; wings dusky, the costal 

 region very dark; stigma rather large; anterior legs simple, their coxae unarmed; 

 sixth abdominal segment retracted, with two distant sharp black teeth. 



