152 U. S. NATIONAL MUSEUM BULLETIN 216 



V. IMPERATOR GROUP 



Median segments of male flagellum not widened; punctures (and 

 hairs) on face of male only moderately dense, the punctures of 

 medium size except near eye, where they are small; interspaces of 

 facial punctures of male about equal to their diameters; punctures 

 on face of female moderately coarse, separated by about 1.0 to 2.0 

 their diameter; pronotum entirely black or its hind corner white or 

 pale; prepectal carina extending dorsad to near midheight of hind 

 margin of pronotum, then curved forward toward front edge of meso- 

 pleurum; lower half of mesepimeron almost bare, with a few hairs 

 near its hind margin above; front and middle coxae and trochanters 

 of male not specialized, the hair on the outer side of the middle coxa 

 not unusually dense; nervellus broken above the middle; ovipositor 

 sheath about 1.9 to 2.3 as long as front wing; ovipositor unusually 

 slender, the dorsal lobe of its ventral valve rather small with two 

 widely spaced sub vertical ridges (fig. 330,g). 



This group includes the two Holarctic species described below and 

 two Japanese species, one undescribed and one named Ephialtes 

 manifesto-tor var. matsumurai by Uchida in 1928, and again in 1936 

 by Uchida as Ephialtes nonmanifestator. Dolichomitus matsumurai 

 (new combination) seems to be a distinct species, close to D. imperator. 



17. Dolichomitus pterelas (Say), new combination 



Figures 333,m; 356 



Ichneumon (Pimpla) pterelas Say, 1829, Contr. Maclurian Lyceum Arts Sci., 

 Philadelphia, vol. 1, p. 71 (Leconte ed., vol. 1, p. 376); ?. Type: ?, 

 Indiana (destroyed). 



Male: Front wing 6.7 to 10.0 mm. long; propodeum without dis- 

 tinct median longitudinal carinae; first tergite about 2.4 as long as 

 wide, about 1.1 as long as second tergite; second tergite about 2.0 as 

 long as wide; subgenital plate as in figure 333,m; genitalia as in figure 

 356. 



Black. Front of scape and pedicel, palpi, tegula, and extreme 

 hind corner of pronotum, whitish; flagellum brown beneath; front 

 and middle legs whitish (sometimes partly tinged with fulvous), 

 their femora more or less fulvous behind except at apex, the middle 

 tarsus brown apically; hind coxa fulvous; hind trochanters whitish; 

 hind femur fulvous with a subapical infuscate band, its extreme apex 

 whitish; hind tibia light brown to fuscous, its basal 0.2 and more or 

 less of its under side toward base, whitish; hind tarsus fuscous or 

 brown, the base of its basitarsus stramineous. 



Female: Front wing 9.5 to 16 mm. long; face of moderate width, 

 its punctures separated by about 2.0 their diameter; median longi- 



