THE CANADIAN ENTOMOLOGIST. 41 



carina between antennre ; clypeus flat ; labruui small, with a basal 

 tubercie ; malar space distinct ; mandibles bidentate ; m. p. longer 

 than stipes, i about one-half as long as 2, 2 = 3, 3 = 4-6; galea 

 enormous, broad, acuminate, rigid; 1. p. moderately flattened, 17: 5, 

 3-4 minute ; segment 6 with strong apical spine and two converg- 

 ing rows ; hind metatarsus nearly twice as long as tibia, the latter 

 with an excavated process ; scopa simple, almost limited to 

 metatarsus ; black, with metallic reflections ; thorax above with 

 ochraceous pubescence ; 21-25 ™^^^- Xylocopa 



virginica in (6) Xylocopidae. 



d. Apoidea. 



Cell III shorter than III5; stigma small; vein IV3 before middle of 

 cellllla; malar space distinct; mandibles broad at apex ; hind 



metatarsus shorter than tibia {7) Apidae. 



II. Pygidialia. 



Clypeus protuberant or mandibles beveled so as to show all of labrum 

 or a great portion of it ; labrum large, without basal process ; 

 posterior angle of mandible before posterior line of eye ; thorax in 

 profile declining beyond scutel, postscutel on posterior face, 

 metathorax at most a little convex ; stigma small or middle-sized, 

 rarely large ; glossa filiform; 1. p. 1-2 flat ; the hosts collect loose 

 pollen and are crurilegid.* b. 



Clypeus hardly protuberant and mandibles not beveled ; usually the 

 labrum is small, concealed, except at base, and with a basal 

 process ; posterior angle of mandible not before posterior line of 

 eye ; metathorax produced beyond postscutel, in profile at least 

 strongly convex, usually with a posterior and a discal space ; 

 stigma large, rarely middle-sized ; vein m at most hardly longer 

 than Vj ; segment 6 usually retracted, the pygidial area then 

 concealed under 5 ; glossa acute, flat, rarely filiform ; 1. p. i 

 various, 2-4 simple ; scopa femorilegid, on trochanter and 

 anterior faces of femur and tibia, in those which collect loose 

 pollen, crurilegid in those which mix the pollen with 



honey * a. 



a. Andrenoidea. 



Tegular very large ; segments 2-4 with greenish, somewhat opalescent 

 apical fascife ; cell III1+2 longer than 2nd IV, not acuminate 

 beyond vein III^; 3 submarginal cells, III about as long as 



*Scopa wanting in inquilines. 



