152 THE CANADIAN ENTOMOLOGIST. 



Every one must and will appreciate the immense work performed 

 by Dr. Kohl in this contribution, and I feel sure the thanks of all work- 

 ing hymenopterologists go out to him for it. His tables are excellent, 

 and with these and the fine figures of venation, representing nearly every 

 known genus, no student will have any difficulty in placing in its proper 

 genus any of these wasps he may capture, provided they are described. 



I think, however, some will take exception to his peculiar views in 

 regard to the rank and value he has given his generic groups, subgeneric 

 groups, allied groups, subgenera and species groups. Nor do I think 

 they will always agree with him in his arrangement of some of these 

 groups. In some cases, at least, according to my views, he has not been 

 successful in showing the true affinities of the groups, and has brought 

 into juxtaposition groups and genera that are widely separated. For 

 instance, I do not consider his group Pemphredon (representing the old 

 family Pemphredonid^) to have any affinity whatever with Ampulex 

 (Ampulicidpe), next to which he has placed it. 



Other similar incongruities might be pointed out, but since my 

 views in regard to the rank, affinities and arrangement of these wasps 

 are incorporated in the following tables, it will not be necessary to call 

 attention to them here ; they will become apparent in my table, and may 

 be readily detected on a comparison of my arrangement with his. 



My arrangement of the families recognized is as follows : 



SuPERFAMiLY II. — Sphegoidea. 



Table of Families. 



Middie tibiae always with two apical spurs 5. 



Middle tibiae with only one apical spur (occasionally absent in some 

 males). 



Median cell in hind wings not twice as long as the submedian, the 

 latter often the longer ; front wings with two or three submar- 

 ginal cells J if with one only the head transverse, not quadrate, . 2. 



Median cell in hind wings fully twice as long as the submedian ; 

 I front wings with only one submarginal cell, very rarely with an 

 indistinctly defined areolet. 



Head transverse, the temples not very broad ; scutellum mar- 

 gined, the postscutellum armed with a spine, thorn or 

 forked process and with squamce ; front wings with the 



