THE CANADIAN ENTOMOLOGIST. o9 



VI (r St Anal) for C'lu; vein a for mcu, which [ hold is the cross-vein 

 element of the arculus (basal nervure) ; IV3 in my table is the first recur- 

 rent nervure ; cell ist IV for M; 2nd IV for W^;. Ny for Mj V for 

 Cuj ; VI for Cu. * Section 1 of vein IV=:the vein separating cells III 

 and ist IV ; when not otherwise indicated segment = dorsal segment of 

 abdomen. Scopa relates to the ventral surface of the ajjdomen of females 

 of Trypetoidea, and to the hind legs of other bees : it is the brush in 

 which females place and carry their pollen, and is not ap[)lied lo other 

 parts or to bees which do not collect pollen ; m. p. 6 ^ maxillary palpi 

 6 jointed ; m. p. i longer than 2 = basal joint of maxillary palpi longer 

 than the second ; 1. p. 1 ^ basal joint of labial pal[)i. Joints 3-4 are 

 usually simple and subequal ; 1-2, however, may be either one or both 

 flattened, or may be both simple and, in either case, may vary gieatly in 

 length. I have adopted a formula giving the measurements of these two 

 joints in i/io mm. Thus in Xylocopidie I. p. 17:5 means that the basal 

 joint is 17/10 mm, and the next 5/10 mm, and also indicates that i is more 

 than three times as long as 2. 



This synopsis is based upon the females, but the characters of the 

 males have influenced me in some cases where changes were made. 

 Usually the males of Pygidialia have a distinct pygidial area on segment 

 7, often on a distinct process, but some of them show no sig\i of it. 



Anthophila. 

 Females. 



Segment 6 exserted or retracted, with a pygidial area II. 



Segment 6 exserted, without a pygidial area I. 



I. Apygidialia. 

 Vein IV2 never strongly bent or directed outward before joining /;/ \ no 



facial foveoe ; glossa filiform ; m. p. shorter than galea i. 



Vein IV2 strongly bent or directed outward before joining m; glossa flat, 

 bilobed ; 1. p. simple, at most 1 = 2-3 ; m. p. 6, lopger than 

 galea; facial foveas present; mandibles bidentate ; cell IIIn2 



acuminate beyond vein III5 a. 



a. CoUetoidea 

 Submarginal cells 2, III. + III5 and III4, the first much longer ; stigma 

 large; cell III1+2 pointed near costa : vein IV3 before or opposUe 



*Macroxyela seems to me more typical than the composite type of the authors, 

 because the arciilu'^ is nearer the base of the wing, where it mighl l)e expected in a 

 primitive case. To be sure, it does not show vein VI., but the position of that vein is 

 indicated by an angle. See Comstock, Manual, 6o6v 



