MEGACHILE. 75 



white pubescence ; the legs obscurely rufo-piceoiis above, distinctly 

 80 beneath; wings siibhyaline, the ncrvnres dark fusco-ferru- 

 ginous. Abdomen slightly shining, very finely punctured, and 

 with narrow white pubescent fasciee ; clothed beneath with whitish 

 pubescence, which is margined with black laterally. 



Ilah. Ega, Tapajos, and Tunantins. 



40. Megachile ventralis. 



Female. Length 5| linos. — Black ; the thorax densely clothed with 

 cinereous pubescence, faintly tinged with fulvous above. The 

 vertex with pale fulvous pubescence ; on the sides of the face it is 

 cinereous ; the clypcus strongly punctured, its anterior margin 

 rounded. The wings hyaline, their apical margins clouded; a 

 yellow stain in the marginal cell ; the nervurcs and tegulse rufo- 

 testaeeous ; the legs obscurely rufo-piceous, with a thin cinereous 

 pubescence, that on the tarsi pale fulvous ; on the basal joint of 

 the posterior pair it is dark fuscous. Abdomen cordate and shining, 

 with the apical segment opaque, very finely pianctured ; beneath, the 

 basal segment and a small space in the middle of the second with 

 white pubescence, that on the other parts with black pubescence. 



Hah. Ega. 



41. Megachile rubriventris. 



Female. Length 4| lines. — Head and thorax black, abdomen ferru- 

 ginous. The face with a little cinereous pubescence, on the vertex 

 it is black ; the flagellum fulvous beneath. Thorax with black 

 pubescence above ; on the metathorax, the sides beneath, and also 

 on the legs beneath it is cinereous ; on the legs above it is black ; 

 the claw-joint of the tarsi ferruginous ; wings fulvo-hyaline, the 

 nervurcs and tegulaj ferruginous. Abdomen ferruginous, shining, 

 and with fine shallow punctures ; the pubescence beneath white, 

 except that on the two apical segments, which is black. 



llah. Santarem. 



42. Megachile fossoris. 



Female. Length 5| lines. — Black, and with the extreme base of 

 the abdomen and the legs ferrugmous. The face on each side of 

 the clypeus with a little cinereous pubescence ; the mandibles and 

 the antennce beneath ferruginous ; a narrow fringe of fulvous 

 pubescence crossing the vertex between the ocelli ; the posterior 

 margin of the vertex witli a similar fiinge. The thorax above 

 with fulvous pubescence, short and sparing on the disk ; on the 

 metathorax, the sides, and beneath it is cinereous ; wings fulvo- 

 hyaline, the ncrvur(;s and tegula; ferruginous. The apical margins 

 of the segments of the abdomen and the base of the first segment 



