apidjE. 415 



c. Maxillary palpi 2-jointed. 



a'. Pubescence on head, thorax, and abdomen 



very short, thick, and clo3e Crocisa, p. 515. 



b'. Pubescence on head, thorax, and abdomen 

 very long and dense. 

 or. Posterior tibise bare, concave on outside, 



and fringed -with long- curled hairs .. Bomb us, p. 544. 

 V^. Posterior tibi?e densely pubescent and 

 convex on outside, the fringe of hairs 

 short not curled Psithyeus, p. 555. 



d. Maxillary palpi 1 -jointed Apis, p. o5G. 



B. Fore wing with two cubital cells. 



a. Scutellum armed with a lateral tooth pos- 



teriorly CCELIOXYS, p. 508, 



b. Scutellum not so armed. 



a'. Abdomen ( 2 ) furnished with a ventral 



scopa or pollen-brush ; ( cJ ) dentate at 



apex. 



«'. Abdomen long, narrow, aubcylindrical 



and curved. 



a^. Apex of abdomen ( $ ) simple ; ( cf ) 



armed with two teeth Heriades, p. 507. 



6^. Apex with a median longitudinal 



carina and a tooth on each side ( c^ ). [p. 467. 



$ unknown Thaumatosoma, 



b"^. Abdomen convex above, not cylindrical 

 nor curved. 

 n^. Maxillary palpi 2-jointed. 



a^. Second recurrent nervure received 

 distinctly beyond apex of 2iid 



cubital cell Anthidium, p. 490. 



6*. Second recurrent nervure received 

 at or within apex of 2nd cubital 



cell jNIegachile, p. 470. 



P. Maxillary palpi 'J-jointed. 



a*. Front between bases of antennae 



tuberculate Lithurgus, p. 469. 



h*. Front between bases of antennae not 



tuberculate Osmia, p. 4G8. 



c^. Maxillary palpi 6-jointed. 



a^. Inner tibial spur on posterior leg 

 ( $ ) bent, lunate, with a row of 



tine minute teeth on inside; an- [p. 461. 



teunaj in both sexes simple .... Ctenoplectra, 

 6*. Inner tibial spur on posterior leg 



( $ ) simple ; antennae {(S) with [p. 460. 



apical two joints dilated, flat. . . . Stegaxomus, 

 b'. Abdomen, $ without a ventral scopa ; 

 S rounded at apex, in one genus tri- 

 dentate. 



o^. Maxillary palpi 6-jointed Allodape, p. 505. 



li^. Maxillary palpi 2-jointed. 

 «'. Apex of abdomen, § subangular, 



J rounded Stelis, p. 496. 



P. Apex of abdomen, $ incised, cJ tri- 



dentate Parevaspis, p. 496. 



C. Fore wing with one complete cubital cell or 



none Mrlipona .p. 559. 



