ICHNEUMON-FLIES, PART 2: XORIDINAE 503 



Rhadinopimpla. We refer all of them to the subgenus Xorides, 

 where some probably form new combinations. The other non- 

 Nearctic species referable to the subgenus are: Xorides holsaticus 

 Heinrich 1951, in the indicatorius group; Neoxylonomus strandi 

 Clement 1938, in the rileyi group; and Xorides centromaculatus 

 Cushman 1933, Moansa ornatus Tosquinet 1903, and Xylonomus 

 vitiosus Turner 1919, in the albopictus group. The names ornatus 

 and vitiosus are new combioations in Xorides. 

 The Nearctic species are treated below. 



I. FRIGIDUS GROUP 



Body stout; occipital carina complete; temple with fine sparse 

 punctures and not distinctly striate (fig. 315,h); apex of female 

 flagellum only a little curved, its segments very weakly specialized 

 (fig. 328,h) ; tooth at dorsal end of epomia rather weak; areola almost 

 regularly pentagonal; a low blunt tooth at apex of area dentipara; 

 median longitudinal carinae approaching closely but not fused at base 

 of areola (fig. 314,f); front tibia of female moderately inflated; spine- 

 like bristles on front face of tibia rather numerous, moderately stout 

 (fig. 313,b); comb on front of apex of front tibia containing rather 

 weak bristles; nervellus broken near the middle; first tergite of male 

 about 2.0 as long as wide, of female about 1.6 as long as wide, with a 

 deep oblique lateral groove just beyond the spiracle which continues 

 on to the dorsolateral surface; median longitudinal carinae of first 

 tergite complete to the apex but in the female indistinct beyond the 

 middle of tergite; second tergite with a rather strong oblique groove 

 cutting off its basolateral corner. 



Tins group includes only the Nearctic X. frigidus. It is close to a 

 large Palaearctic group of species (the indicatorius group) containing 

 the genotypes of Xorides, Xylonomus, and Sterotrichus, which differs 

 from the frigidus group in having the temple with close fine punctures 

 and subvertically aciculate, and the apex of the female flagellum more 

 strongly curved and specialized. 



2. Xorides (Xorides) frigidus (Cresson) 



Figures 313,b; 314,f; 315,h; 328,h 



Xylonomus frigidus Cresson, 1870, Trans. Amer. Ent. Soc, vol. 3, p. 168; ? . 



Type: 9 , Hudson Bay Territory (Philadelphia). 

 Xylonomus (Xylonomus) plesius Rohwer, 1913, Proc. U. S. Nat. Mus., vol. 45, 



p. 354; ? . Type: 9 , ?United States (Washington). 

 Xylonomus (Moerophora) yukonensis Rohwer, 1913, Proc. U. S. Nat. Mus., vol. 



45, p. 355; 9 . Type: 9 , Fort Yukon, Alaska (Washington). 



Front wing of male 5.5 to 7.0 mm. long, of female 7.5 to 10.3 mm. 

 long. Structure as described under the species group. 



Blackish. Palpi brown; front and middle legs fulvous, their tarsi 



