THE CANADIAN ENTOMOLOGIST. 223 



(4) P. Rileyi, Fox, 9 6- (s) P- dispar, Fox, ^ . 



(5) P. confertim, Fox, (^ . (6) P. cuspidatus, Smith, $. 



(6) P. Provancheri, Ashm., $ . {7) P. armeniacise, Ckll. and 



= concolor, Prov., nee. Fox. 



Say. (9) DiODONTUS, Curtis. 



(7) P. montanus, Dahlb., 2 6- (0 D. occidentalis. Fox, $ (J. 



(8) P. (?) marginatus, Say. (2) D. rugosus, Fox, ^ . 



(7) Ceratophorus, Shuckard. (3) D. flavitarsis, Fox, ^ . 



(8) Passaloecus, Shuckard. (4) D. americanus,Pack., $ ^ . 

 (i) P. annulatus, Say, ^ S  (s) ^- Gillettei, Fox, ? . 



(2) P. relativus. Fox, (^ , (6) D. luguminiferus, Ckll, S • 



(3) P. distinctus. Fox, S- (?) D. nigritus, Fox, $. 



(4) P. mandibularis, Cress, p c^ . (10) Polymistus, Saussure. 



Subfamily II, — Pseninse. 



In this subfamily, the species, as a rule, are narrower and more 

 elongate ; the head less distinctly quadrate, more transverse, with narrower 

 temples ; the front wings with three cubital cells ; while i/ie aufennce are 

 always inserted on or near the middle of the face, far above the clypeus. 



Psen, Latreille, was the first genus to be described, but the description 

 was a broad one, and included all the species known at that time. It 

 was subsequently, however, subdivided by Shuckard and others, and in 

 order to do justice to these authors, and to prevent the erection of new 

 generic names, I prefer to follow them in preference to Kohl, who would 

 restrict all to a single genus, with Sphex atra, Fabr. (Panzer), as the type. 



This was also the status of the subgenera up to the appearance of 

 Kohl's work in 1896, and was acceded to and accepted by all active 

 Hymenopterologists, and I can see no good reason for making a change 

 in our definition of these subgenera at this late date, and thus bring con- 

 fusion into our nomenclature and text-books. 



Tne genera recognized may be tabulated as follows : 



Table of Genera. 



Cubitus in hind wings originating beyond the transverse median nervure, 



the latter short and straight, perpendicular. 2. 



Cubitus in hind wings originating before the transverse median nervure, 

 the latter long and oblique or slightly bent, but not perpendicular. 



Second cubital cell receiving both recurrent nervures, rarely with 

 the first recurrent nervure interstitial with the first transverse 



