308 WILLIAM J. FOX. 



Anterior wings with three complete discoidal cells, therefore with two recuri'ent 

 nervures. 

 Abdomen distinctly petiolate, the petiole long; head and thorax generally 



hairy Penipliredon Latr. 



Abdomen subsessile, or with a very short petiole ; head and thorax not hairy. 

 Posterior tibise unarmed (the calcaria excepted) ; labrum pointed at tip. 



Passaloeciis Shuck. 

 Posterior tibipe spiuose, or subserrate; labrum emarginate at the tip. 



Diodontus Curt. 



PE9IPHREDOIV Latreille. 

 FEMALES. 



The submarginal cells each receiving a recurrent nervure. 

 Dorsulum with strong transverse wrinkles. 

 Anterior margin of the clypeus in the middle subtruncate, not at all angular ; 

 petiole of abdomen nearly as long as the first two joints of the hind 



tarsi united concolor. 



Anterior margin of the clypeus in the middle forming an angle ; petiole of 

 abdomeu but little if anything longer than tbe first joint of the hind 



tarsi aiigularis. 



Dorsulum punctate, or with very faint wrinkles and punctures. 



Anterior margin of the clypeus strongly emarginate medially; dorsulum 

 punctured, and in addition with some indistinct wrinkles; petiole fully 



as long as the first joint of the hind tarsi Rileyi. 



Anterior margin of the clypeus in the middle with two strong emarginatious, 

 or strongly tridentate ; dorsulum punctured only; petiole slightly 



shorter than the first joint of the hind tarsi iiearcticus. 



The recurrent nervures both received by the first submarginal cell. 

 Dorsulum with large, rather close punctures. 



Anterior margin of the clypeus produced medially ;* smooth space on meta- 

 thorax broadly lunulate, the enclosed space with irregular rugse ; petiole 

 distinctly longer than the hind coxte and trochanters united. 



inoriiattis. 



Anterior margin of clypeus emarginate medially; smooth space on meta- 



thorax divided by a furrow, the two parts together forming a narrow 



lunule ; the enclosed space laterally with radiating ridges, medially with 



irregular ridges; petiole shorter than the hind coxse and trochanters 



united bipartior. 



Dorsulum with large, very sparse punctures teuax. 



MALES. 

 ■\ 

 The submarginal cells each receiving a recurrent nervure. 



Joints of the flagellum not angular or denticulate beneath. 

 Clypeus with a wide emargination ; enclosed space on metanotum rugose. 

 Head from above scarcely twice as broad as long in the middle, much nar- 

 rowed behind ; petiole a little longer than the first joint of the hind 

 tarsi coucolor. 



■•■■ The student must not be deceived by the labrum which projects in the spe- 

 cies of this section. 



