North American Hymenoptera. 243 



Has some resemblance to a Xohides, but the mandi- 

 bles are bidentate, and the metathorax and anterior part of 

 the thorax differ. It is a very distinct species. I have 

 thought it may be useful to give the above more detailed 

 and characteristic description than that quoted, X'hich is 

 too short and unimportant. A good name for this species 

 would be gladiator. 



4- A. densatus* Black ; thorax rufous ; tergum 

 densely punctured. 



Inhabits Indiana. 



Body black, with short, small hairs : orhits above with 

 a white spot ; facey below the antennae, and month, pale 



yellowish : antenna : thorax reddish-brown ; 



with an abbreviated black vitta : scutel reddish-bro\^Ti : 

 wings hyaline ; nervures fuscous ; stigma yellowish : 

 abdomen subllnear, not attenuated towards the base, but 

 in the first joint: tergum with dense, rather large, but 

 not profound punctures ; posterior edges of the segments 

 slightly rufous : oviduct nearly half the length of the ab- 

 domen : feet dull yellowish ; coxae and trochanters whit- 

 ish ; tips of the tibiae and of the tarsi dusky. 



Length 9 over one fifth of an inch. 



5. A. recurvus. Black ; feet honey-yellow ; posterior 

 tibiae and tarsi with black joints. 



Inhabits Indiana. 



Body rather slender, black : head not extended be- 

 hind the eyes : orhits, nasiis and palpi white : thorax tri- 

 lobate (as in XoRiDES and Pimpla) with a white line 



width 



metathorax long^ convex: tergu 



ments subequal in length ; first and second segments with 

 a transverse impressed line near their tips ; remaining seg- 

 ments, excepting the last, with a lateral, transverse, im- 



