ABT. 16 



NORTH AMERICAN ICHNEUMON-FLIES CUSHMAN 



6. Frons with a single stout horu, rarely imlLsthict (fig. la), abdomen strongly 



and coarsely punctate Listrognathus Tschek. 



Irons unarmed or with two minute horns or with a more or less promi- 

 nent median carina ; abdomen very finely coriaceous and not or very 

 weakly punctate 7 



v<>AAf=\^ 



TfA.C 



Fig. 2. — First Abdominal Segment of Female : a. Agono- 



CRYI'Xns DISCOIDALOIDES (ViERECK), LATERAL ViEW ; 6. 



Messatopords discoidalis (Cresson), Lateral View; 

 c. Mallochia agenioides Viereck, Dorsal View ; d. Same, 

 Lateral View ; e. Listrognathus albomaculatus, Lat- 

 eral View; f. Crypturopsis audax (Cresson), Dorsal 

 View ; g. Mesostencs leucopus Ashmead, Dorsal Vibw ; 

 h. Same, Lateral View 



7. Areolet pentagonal in position, intercubiti convergent, open at apex, the 



cubitus bent forward at recurrent and backward at second intercubitus 

 (or its normal position), sometimes subobsolete beyond recurrent, recur- 

 rent at or before middle of areolet (fig. Qf and f;)_Diapetimorpha Viercck. 

 Areolet elongate or quadrate, intercubiti parallel (sometimes open at 

 apex), recurrent usually much closer to second intercubitus (or its 

 normal position) than to first, cubitus beyond recurrent straight or 

 nearly so (fig. 6 h and i) 8 



8. Frons mutic Crypturopsis Ashmead. 



Frons bicornute (fig. Id) Polyaenus Cresson. 



9. Second discoidal cell neither pointed nor strongly narrowed at base 10 



Second discoidal cell pointed or very narrow at base (fig. 5) 12 



