THE CANADIAN KNTOMOLOGIST. 349 



Claws with a single tooth beneath, although i.ometinies very minute, 

 more rarely without a tooth, the claws simple ; tarsal comb in 9 

 wanting ; abdomen always with a r-jointed petiole ; cubitus in hind 

 wings interstitial. 



Antennae inserted on the middle of the face; metathorax with a 

 large U-shaped area above ; mesopleura not longer than the 



height of the thorax Subfamily III., Sceliphronin?e. 



Antennas inserted far anterior to the middle of the face, on or just 

 above an imaginary line drawn from base of eyes ; metathorax 

 without a large U-shaped area above ; mesopleura much longer 

 than the height of the thorax , .Subfamily IV., Podiimv. 



SuBFAMlLYY I. — Spheginse. 



In this group, or subfamily, the second and third cubital cells, in the 

 front wings, each receive a recurrent nervure, or both recurrent nervures 

 are received by the first cubital cell ; the antennae are inserted on the 

 middle of the face; the tibise are strongly spinous ; the anterior tarsi in 

 the $ always provided with a tarsal comb ; while the claws are never 

 simple, being always armed with from i to 5 teeth. 



Some of the genera falling in this group are quite closely allied and 

 difficult to separate, but it is believed all can be easily separated with the 

 use of the following table : 



Table of Genera. 

 Front wings with three cubital cells, the second and third each receiving 



a recurrent nervure 2. 



Front wings with only two cubital cells, the first receiving both recurrent 

 nervures; marginal cell short, rounded at apex; median and sub- 

 median cells equal ; cubitus in hind wings originating beyond the 

 transverse median nervure ; claws with 2 blunt teeth 



beneath Neosphex, Reed. 



= Pseudosphex, I'ischb. 



2, Second cubital cell wider (higher) than long 4. 



Second cubital cell as long or longer than wide (high), rhomboidal or 



rectangular 3 . 



3. Head normal, transverse, pronotum shorter than the mesonotum or no 



longer ; claws with 2 teeth beneath. 



Clypeus anteriorly truncate, usually with a reflexed rim and 

 without a median emargination (rarely dentate) ; scutellum and 



