THE CANADIAN ENTOMOLOGIST 269 



BEES OF CANADA.— FAMILY MEGACIIILID/E. 



BY F. W. L. SLADEN, OTTAWA. 



Principal Characters of Family. — Long-tongued, bees, wings 

 with only two submarginal cells, female with pollen brush on 

 underside of abdomen, or, in parasitic genera, absent. The two 

 basal joints of labial palpi very elongate, following joints minute, 

 labrum not exposed. 



Table of Genera. 



(Where the genus contains only one species this is included. Sub- 

 genera are not included, as a rule. Whether Chlorosmia, 

 Alcidanea, A titochelestonia, Androfjictis , and possibly Monumetha 

 should be entitled to generic rank, or be regarded merely as sub- 

 genera, is a matter of opinion. The super-generic name for this 

 group should be Chelestoma Lat.). 

 1. Skin of abdomen with pale bands or spots, or second recurrent 

 nervure received by submarginal nervure beyond apex of 



second submarginal cell, Suhiam'ily Anthidiince 2. 



No pale bands or spots on abdomen, second recurrent nervure 

 always received by second submarginal cell 3. 



2. Margin of 7th dorsal segment in male toothed, female with 



pollen brush A ntliidium Fab. 2a. 



Margin of 7th dorsal segment in cT simple, female without 



pollen brush St elis Fz. 



2a. No pulvillus between claws, makes cottony nest, 



subg Anthidium Ckll. 



Pulvillus between claws, makes resin nest (Cockerell), 



subg Dianthidium Ckll. 



3. A pulvillus between claws, abdomen strongly convex. 



Subfamily Osmiince 4. 



No pulvillus between claws, abdomen more or less flattened. 

 Subfamily MegachilincB 17 



4. Base of abdomen bordered with a strong transverse ridge, in- 



sect coarsely punctured, c/' with only two ventral segments 



fully exposed Heriade.';, Spin, 



Basp of abdomen not bordered with strong ridge. 



