ICHNEUMON-FLIES, PART 2 1 XORIDINAE 523 



beyond the spiracle; sublateral longitudinal carinae of fii'st tergite 

 strong to the apex; median longitudinal carinae of first tergite sharp 

 and distinct on basal half, more or less obsolescent on apical half, 

 stronger and longer in male than in female; second tergite with a sharp 

 oblique groove that cuts off its basolateral corner, near the lateral 

 edge the groove turning mesad and quickly fading. 



This group contains the four Nearctic species below and the 

 European Xorides alpestris (Habermehl), 1904. 



18. Xorides (Xorides) harringtoni Rohwer 



Figures 315,e; 329, a 



Xylonomus canadensis Harrington, 1891, Canadian Ent., vol. 23, p. 133; tf, 

 ? . Name preoccupied in Xorides by Provancher, 1875. Types: cf, 

 ? [near Ottawa, Ont.] (Ottawa). 



Xorides harringtoni Rohwer, 1920, Proc. U. S. Nat. Mus., vol. 57, p. 443. New 

 name. 



Front wing of male 10 to 11 mm. long, of female 12 to 16 mm. long, 

 wrinkles on temple near and paralleling hypostomal carina weak 

 and indistinct; segments of female flagellum at the subapical bend 

 about 0.8 as long as wide; mesopleurum faintly rugulose, its punctures 

 separated by about 0.8 their diameter; median longitudinal carinae 

 of propodeum very high and strong; first tergite about 2.2 as long as 

 wide in male, about 2.0 as long as wide in female; first tergite of 

 female rather flat beyond its middle, its median longitudinal carinae 

 indistinct; first sternite of male surpassing spiracle by about 0.5 its 

 average width; first sternite of female ending at the spiracle. 



Black, the head and thorax sometimes stained with ferruginous, 

 especially the temple and face of the female. Clypeus brownish 

 basally; mandible stained with ferruginous basally; palpi dark brown, 

 the maxillary palpus medium brown apically; scape of male pale 

 brown in front; flagellum of female with a white band that covers 

 about 5.5 segments; apical margin of femora and of front and middle 

 tibiae, basal 0.12 of tibiae, upper face of male front tibia, basal half 

 of hind basitarsus, and all of first four segments of front and middle 

 tarsi, white or whitish. 



This species shares most of its characters with the western X. cali- 

 -fornicus. Collections from localities between the known ranges of 

 X. harringtoni and X. californicus may produce intermediate speci- 

 mens which will prove that they are only subspecifically distinct. 



Specimens: 9, "Betula lutea" Cranberry Lake, N. Y., June 14, 

 1919, C. J. Drake (Washington). d\ 9, Hymers, Ont., June 1 and 

 14, 1913 (New York). 2cf, Hymers, Ont., June 14, 1913 and June 19, 

 1912 (Townes). 9, North Bay, Ont., June 9, 1905 (Ithaca). 9, 

 Ottawa, Ont., June 1885, W. H. Harrington (Ottawa). 9, Ottawa, 



