AKT. 16 NORTH AMERICAN ICHNEUMON-FLIES CUSHMAN 29 



Described from eight females, six collected during June and July, 

 1924, at the type locality and received from Prof. C. H. Kennedy, 

 Ohio State University; one from New Haven. Conn., June 17, 1011, 

 A. B. Champlain ; and one from Chevy Chase, Md., D. G. Fairchild. 



Genus DIAPETIMORPHA Viereck 



DiapetimorpTui Vieheok, Proc. U. S. Nat. Mus., vol. 44, 1913, p. 56.5. Qeno- 

 .type. — (Crypius armatua Ashmead) =Diapctimorph<i introitus (Cres.son). 



Very closely related to Crypturopsis Ashmead but at once dis- 

 tinguishable by the form of the aroolet, which appears to be the only 

 constant difference. The flagellar joints are more slender but bear 

 the same relation to each other; the scutellum is usually somewhat 

 more convex with the lateral carinae stronger; the apical carina of 

 the propodeum is usually more distinct, especially in the male; the 

 apophyses in the female are more distinctly compressed and usually 

 distinctly carinate, in the male they are not developed ; the occipital 

 carina is not or only weakly sinuate behind the cheeks; and the 

 nervellus is broken at or near the middle with its upper abscissa 

 usually nearly or quite perpendicular to the cubitella. 



Apparently bears very little relationship to Diapetus Cameron, 

 with Avhich Viereck originally compared it, and which appears, from 

 the description, to be similar to Earrana Cameron. 



The species here assigned to this genus form a rather hetero- 

 geneous group, which should perhaps be separated into several 

 genera. 



The seven North American species known to me may be distin- 

 guished by the following key : 



Crypturopsh? ar?nu\fus (Provancher), which perhaps belongs to 

 this genus, is included. 



1. First tergite red, others black and white. 



Crypturopsis? armatus (Pi'ovancher). 

 Abdomen otherwise colored 2 



2. Nervellus broken far below middle and strongly inclivous; apical carina in 



female entirely wanting between apophyses; abdomen black and white, 



tergites 3 and 4 in male sometimes pale reddish 3 



Nervellus broken at or not far below middle, i*eelivous, upper abscissa per- 

 pendicular to cufiitella ; apical carina in female more or less distinctly in- 

 dicated between apophyses ; abdomen red, rarely in male black and 

 yellow 4 



3. Mesoscutum with two small spots or lines on disk; petiole basally white; 



hind coxa in female red and white orba (Say). 



Mesoscutum with a single median spot; petiole basally black; hind coxa in 

 female black and white cinctiventris, new name. 



4. Clypeus weakly convex, without a distinct reflexed margin ; mesoscutum with 



two small spots or lines on disk (sometimes indistinct) ; lu>ad in both sexes 

 black and white, the pale orbits not interrupted at top of eyes; male 

 antenna without pale annulus 5 



