ICHNEUMON-FLIES, PART 2\ EPHIALTINAE 131 



ovipositor tip is ordinarily used only as a final confirmation of the 

 determination. The female is very similar to that of D. messor. 



Our European specimens have the stigma light brown, while our 

 American specimens have it dark brown or blackish. The material is 

 too scanty, however, to decide whether the American representatives 

 should be considered a distinct subspecies. 



Specimens: 9, Hinsdale Co., Colo., June 28, 1937, C. L. Johnston 

 (Lawrence). 9, parasite on wood borer in aspen (Populus sp.), 

 Oct. 5, 1909 (Ottawa). 2cf , 19, Toronto, Ont., October 1898, Wm. 

 Brodie (Washington and Townes). 9, Earl Grey, Sask., June 28, 

 1925, J. D. Ritcher (Ottawa). 29, Ashford, Wash., Aug. 18, 1940, 

 H. and M. Townes (Townes). 9, near Hamburg, Germany, G. 

 Heinricb (Townes). 9, reared from Saperda populnea, Hanover, 

 German}^, G. Heinrich (Townes). 



This species is transcontinental in the Transition zone and occurs 

 also in Europe. It is rare in America. Its usual host is Saperda 

 boring in Populus and Salix. 



8. Dolichomitus messor (Gravenhorst), new combination 



Figures 330,f; 333,g; 350 



Male: Front wing 5.5 to 11.5 mm. long; face with moderately 

 small, sharp, dense punctures and dense hairs; prepectal carina and 

 propodeum approximately as in D. populneus; front trochanters and 

 base of front femur more or less flattened below, with more or less 

 dense fine hairs; apex of front coxa in front with dense fine hairs; 

 outer side of middle coxa often with a weak median swelling on which 

 the hairs are a little denser than elsewhere on the coxa; first and second 

 tergites about 1.9 as long as wide; subgenital plate as in figure 333,g; 

 genitalia as in figure 350. 



Colored more or less as described under the subspecies D. messor 

 perlongus, 



Female: Front wing 10.5 to 22 mm. long; face with moderate-sized 

 sharp punctures that are moderately close or moderately distant, 

 rather evenly distributed or absent near eye except for a vertical row 

 of punctures paralleling inner margin of eye; prepectal carina short, 

 its dorsal end near level of lower 0.17 of hind margin of pronotum, or 

 sometimes faintly continued further dorsad; first tergite about 1.6 

 as long as wide, its tubercles moderately prominent, a little elongate; 

 second tergite about 1.4 as long as wide; ovipositor sheath about 1.65 

 as long as front wing, its hairs not unusually long; tip of lower valve 

 of ovipositor as in figure 330,f, its teeth apicad of dorsal lobe separated 

 from hind edge of dorsal lobe by a distinct gap. Structure otherwise 

 as described for D. populneus. 



