148 Mr. F. Smith oh some new Genera and Species 



black, tinted with green at the base, their apex piceous. The wings 

 hyaline, their apical margins slightly clouded, the nervuree testaceous, 

 the tegulsB shining green ; the legs obscurely rufo-piceous, the tarsi 

 palest, the pubescence pale and glittering; the pectus with a brassy 

 tinge. Abdomen subovate, very convex above and shining, finely 

 punctured, the basal segment more strongly so ; the pubescence on the 

 apical segment fuscous, that on the abdomen beneath pale ; the norms 

 on the posterior femora white 

 Hah. St. Paul (Brazil). Mr. II. YV. Bates. 



Genus Mkgalopta, Smith. 

 1. Megalopta ianihina. 



M. nigro-purpurea violaceo tincta, facie polita a?rata ; pedibus nigris, alia 

 hyalinis, venis testaceis. 



Female. Length 4 lines. Dark purple with tints of violet, shining 

 and very delicately punctured ; the face brassy ; the clypeus with deep 

 punctures, its anterior margin, the mandibles and base of the scape, 

 ferruginous; the flagellum, except the two basal joints, fulvous be- 

 neath ; tips of the mandibles black. Thorax : the tegulae and legs 

 rufo-piceous, apical joints of the tarsi ferruginous ; the coxa? and 

 femora with cinereous pubescence, the scopae on the posterior tibia? 

 black ; the wings hyaline, the nervines testaceous, the stigma pale. 

 Abdomen with a few cinereous hairs at the apex, and the margins of 

 the segments beneath fringed with the same ; the abdomen pale mfo- 

 testaceous beneath. 



Hab. Ega (Brazil). In the Collection of the British Museum. 



Of this species Mr. Bates remarks, — " A most lovely species of 

 bee, exhaling a very powerful aroma months after death. One day, 

 on breaking a piece of dead branch to pieces, I came upon a row of 

 cells containing these bees, already enclosed and ready to escape. 

 There were about a dozen cells placed end to end, of which two con- 

 tained pupoe ; most of them escaped : I could only secure four or 

 five." 



Genus ArisxA. 



Head rather narrower than the thorax, sub-orbimlate ; eyes elongate- 

 ovate ; ocelli in a cui've on the vertex ; antenna geniculated, 12-jointed 

 in the female, the flagellum very slightly thickened towards the apex. 

 Mentum elongate, cylindrical; the labial palpi 4-jointed, the joints 

 short, stout, and cylindrical, nearly of equal length, each being in 

 succession more slender, the apical one pointed ; the paraghssee as long 

 as the two basal joints of the palpi, and capitate at their apex ; the 

 maxillary palpi 6-jointed, the joints short, stout, and cylindrical, 

 tapering to the apical joint ; the labium about half the length of the 

 mentum, blunt at its apex, and very pubescent. Thorax rotundate ; 



