270 THE CANADIAN ENTOMOLOGIST 



5- Base of alxlomeii strongly concave, the definite basin thus 



foimed inipunctate Ashmeadiclla, Ckll. 



No definite basin on base of abdomen 6. 



6. Not very elongate, cubital ncrviire between first transverse 



rubital ncrvurc and first recurrent nervure usu;>ily as lont 

 as, never less than one-half as long as, first transverse cubital 



nervure 7. 



Very elongate, cui)ital ner\ure between first transverse cubital 

 nervure and first recurrent ner\ure half or less than half as 

 long as first transverse cubital nervure, cf with small lateral 



spine-like tooth on segment 8. 



7. Head with two large teeth beneath, nearly the whole of clypeus 



impimctate, two small tubercles on margin of clypeus near 

 centre, mandibles ver>- long 



Cephalosmia n.g., 1027, armaliceps, Cr. 



Invermerc, B; C, (^kanagan Landing, B. C. — IV, V, VI. 

 Checks not armed. cKpeus punctured Osmia, Spin. 



8. Males ' 9. 



Females 13. 



9. Brilliant metallic green, ventral segments 1 and 2 with small 



median tootli . Chlorosmia n.g., 20o0,fulgida, Cr. 

 British Columbia. 

 Black 10. 



10. Terminal antennal joint much narrowed and modified into a 



cur\ed spine, flagelliim widcK' and shallowly channelled be- 

 hind, scape dilated Alcidamca Cr. 



Terminal antennal joint not much narrowed, not modified into 

 a spine ; 11. 



11. Ventral segment 2 with a large tooth, segment I with median 



impressed line at base, segment 7 pointed, compressed, exca- 

 vated . Autochelostoma, n.g., 2059. canadensis, n.sp. 



Ottawa (?), 14, VIII. 



One specimen, Br. Germain, 1014. 

 Ventral segment 2 without large tooth 12. 



12. Antenna? distorted, joints 4 to 7 wider than long and bearing 



bristles, joints 10 to 13 longer than wide, ventral segment 1 

 bluntly pointed Andronicus Cr., 205?, cylindricus, Cr. 



