AMERICAN HYMENOPTERA. 163 



SYNOPSIS OF .flEGACHILIDJ! 4i\D BOJIBINyE. 



BY CHARLES ROBERTSON. 



This belongs to a series of papers — Andreninse, Trans., 28, 187- 

 194; Halictinse, Can. Ent., 34, 243-250 — intended to bring together 

 in brief form the results of my studies of the local bees. My pur- 

 pose primarily is to facilitate the determination of the species. Con- 

 sequently, the more general groups sometimes give the common 

 characters of the local representatives instead of those of the same 

 groups as represented throughout the world. For example, the 

 Osmiini are described as "greenish, bluish or purplish," although 

 there are Osmiini which are black. The same applies to the 

 colors of Stelidini. I find that all of the local species of Ccelioxys 

 have the first joint of labial palpi shorter than the second. To 

 avoid repeating that fact in the table of the species, I give it under 

 the genus. It does not follow that all species of Ccelioxys agree in 

 that respect. So in other cases, in order to avoid repetition, I have 

 moved the statements of the common characters as far forward as 

 possible. 



Also to facilitate identification I have made tables for each sex. 

 If you are trying to determine the female of Andronicus, it does not 

 help you very much to be told how the male differs from the male 

 of Alcidamea. The characters of the mouth parts are given under 

 the females and are not repeated for the males. 



In this paper vein III, = the vein separating the stigma from 

 marginal cell; section 2 of vein III = the vein separating stigma 

 from first submarginal cell; section 3 of vein III = the vein sepa- 

 rating first submarginal cell from marginal ; III 4 = third transverse 

 cubital nervure; vein IV 2 = second recurrent nervure; vein \ T , = 

 transverse medial nervure; section 2 of vein V = the principal sec- 

 tion of vein separating first and second discoidal cells; vein a = 

 basal nervure; vein m = section of subdiscoidal nervure forming 

 lower border of third discoidal cell ; segment = dorsal segment of 

 abdomen ; joint, unless otherwise indicated, refers to antennae ; supra- 

 orbital line = line drawn across vertex between summits of the e) eg 

 malar space = space between eye and base of mandible, its length 

 taken from the eye to a sinus a little before the middle of the base 



TRANS. AM. ENT. SOC, XXIX. APR L, L903. 



