ICHNEUMON-FLIES OF AMERICA: 1. METOPILNAE 



137 



of its length, obsolescent near apex; second tergite basally sometimes 

 with two weak median longitudinal carinae; epipleurum of second 

 tergite very narrow to moderately wide, of third tergite narrowly 

 wedge-shaped to moderately wide, of fourth to sixth tergites moder- 

 ately wide; seventh tergite exposed in both sexes; female subgenital 

 plate unspecialized, large, rhombic, and weakly convex. 



There are three known species of Periope: P. auscultator Haliday 

 1839 of Europe, P. hoerhammeri (Heinrich) 1949 of Europe and 

 Japan, and P. aethiops (Cresson) 1868 of eastern North America. 

 P. hoerhammeri is by far the most primitive of the three, having a 

 shorter cheek, longer propodeum, and a distinct glymma in the first 

 tergite. P. aethiops is somewhat intermediate between P. hoerhammeri 

 and P. auscultator. All three are structurally very distinct, and it 

 would be a matter of opinion as to whether or not each should be in 

 a separate genus. 



Periope aethiops (Cresson) 



Tryphon aethiops Cresson, 1868, Trans. Amer. Ent. Soc, vol. 2, p. 106; ? . Lecto- 



type: 9, Massachusetts (Philadelphia). 

 Chorinaeus pulchripes Provancher, 1883, Naturaliste Canadien, vol. 14, p. 12 



(Faune, p. 800); 9 • Type: 9 , Chicoutimi, Que. (Quebec). 

 Biology: Washburn, 1918, Rep. State Ent. Minnesota, vol. 17, p. 173. 



Front wing 4.5 to 5.8 mm. long; clypeus and face with only a faint 

 impression separating them; head prolonged below, the cheek about 

 1.25 as long as basal width of mandible; glossae elongate; flagellum 

 weakly clavate in male, more strongly clavate in female, its wider 

 segments about 1.2 as wide as long in male, about 1.25 as wide as 

 long in female; sub tegular ridge thick and rounded; propodeum 

 moderately short, its combined basal area and areola about 1.1 as 

 long as wide; first tergite somewhat narrowed basally, without a 

 distinct glymma; abdomen of female somewhat clavate, not com- 

 pressed or elongate apically. 



Figure 85. — Localities for Per- 

 iope aethiops. 



