THE CANADIAN ENTOMOLOGIST. 43 



Vein a slightly arcuate ; w nearly parallel to line of V, ; facial fovere 

 large, pubescent ; mandibles bidentate ; labrum with a basal 

 process ; scopa various, curl on trochanter and tuft on side of 



metathorax plumose ; 1. p. i arcuate (2) Andrenidre. 



b. Anthophoroidea. 



Vein tn shorter than Vj ; labrum free from mandibles, except when 

 much longer than wide ; mandibles usually before middle of eye, 

 the eye usually bulging behind them ; pygidial area usually 

 concealed by segment 5 ; pubescence rarely long and dense ; 

 scopa absent (7) Melectidae. 



Vein in distinctly longer than Vj ; 3 submarginal cells, III shorter 

 than Illj + IIIg, segment 6 exserted, showing pygidial area. . . . i. 



1. Cell IIIh 2 oblanceolate, shorter than 2nd IV, apex rounded, not bent 



away from costa nor separated for any great distance; stigma 

 obsolete, or nearly ; vein a straight ; \\ in line with IV3, the latter 

 parallel with /n ; metathorax truncate in profile ; mandibles biden- 

 tate, not clasping labrum; scopa simple, on anterior face of tibia, a 

 little pollen extending un base of metatarsus ; m. p. 6, i hardly 

 more robust than 2, at most hardly more than one-half as long ; 

 1. p. I at least three times as long as 2, much longer than 



paraglossse (9) Anthophoridae. 



Cell III1+2 lanceolate, usually longer than 2nd IV, apex acute, bent 

 away from costa and separated for some distance ; cell III4 

 strongly narrowed above ; ve'm- a beyond Vg ; metathorax usually 

 more convex in profile ; mandibles simple or with an apical 

 notch ; scopa on tibia and metatarsus 2. 



2, Vertex crested, usually a little concave on each side, ocelli near its edge; 



middle joints of antennae at least as long as wide ; edge of labrum 

 thin, hairy, clasped by closed mandibles ; m. p. i twice as thick and 

 at least about twice as long as 2; 1. p. i longer than 2; paraglossse at 

 least as long as 1. p. 1-2 ; scopa mainly on anterior faces of tibia 

 and metatarsus, a little more copious on tibia; metatarsus broad, 



with a posterior apical appendage ^10) Eucerida". 



Vertex not crested, strongly convex from side to side, ocelli more 

 remote from its edge ; m. p. 6, i hardly more robust than 2 ; 1. p. 1 

 at most little longer than 2; paraglossre shorter than 1. p. i--2; scopa 

 black, thinly plumose, more strongly developed on outer border of 

 tibia and posterior outer face of metatarsus ; metatarsus narrow, 

 poster apical appendage obsolete, or nearly (11) Emphoridae. 



