ICHNEUMON-FLIES — GELINAE : MESOSTENINI 323 



Keys to the Nearctic species of Idiolispa 



MALES 



1. Punctures on postpetiole separated by about 2 times their diameter; punctures 



on tergites 2 and 3 often rather strong (but small) ; first segment of fiagellum 

 about 2.2 as long as wide; tergite 7 often with a median apical white spot. 



1. albisoleata (Walsh) 



Punctures on postpetiole separated by about 5 times their diameter; punctures 



on tergites 2 and 3 very weak, hardly at all impressed; first segment of 



fiagellum about 3.0 as long as wide; tergite 7 without a white spot ... 2 



2. Clypeus in profile rather evenly convex, its highest point at the middle; temple 



at midheight of eye weakly convex, about 0.75 as long as eye; apical to 

 0.5 of hind basitarsus white; sublateral portions of apical carina of pro- 

 podeum less strongly sloped, so that if projected to midline they would 



meet at about 120° 2. analis (Gravenhorst) 



Clypeus in profile more strongly convex subapically than subbasally, its 

 highest point a little below the middle; temple at midheight of eye approxi- 

 mately flat, about 0.60 as long as eye; apical 0.5 to 0.7 of hind basitarsus 

 white; sublateral portions of apical propodeal carina more strongly sloped, 

 so that if projected to midline they would meet at about 100°. 



3. aestivalis, new species 

 FEMALES 



1. Third tergite with moderately dense setiferous punctures all over; first segment 



of fiagellum about 1.9 as long as wide; tergites 6 and 7 often with a median 



apical white mark 1. albisoleata (Walsh) 



Third tergite almost entirely impunctate and hairless except on its lateral 

 0.25±, where it has very fine weak punctures; first segment of fiagellum 

 about 3.0 as long as wide; tergites 6 and 7 not marked with white ... 2 



2. Clypeus in profile rather evenly convex, its highest point at the middle; temple 



at midheight of eye distinctly convex, about 0.75 as long as eye; sublateral 

 portions of apical carina of propodeum close to horizontal, so that if projected 



to midline they would meet at about 150° 2. analis (Gravenhorst) 



Clypeus in profile much more strongly convex subapically than subbasally, 

 its highest point a little below the middle ; temple at midheight of eye approxi- 

 mately flat, about 0.60 as long as eye; sublateral portions of apical carina 

 of propodeum strongly sloping, so that if projected to midline they would 

 meet at about 125° 3. aestivalis, new species 



1. Idiolispa albisoleata (Walsh), new combination 



Cryptus? albisoleatus Walsh, 1873, Trans. Acad. Sci. St. Louis, vol. 3, p. 80; 

 cf. Type: d', lUinois? (destroyed in Chicago fire of 1871). 



Front wing 3.6 to 7.2 mm. long; clypeus elliptic, rather small, 

 very evenly convex; cheek about 1.25 as long as basal width of man- 

 dible; temple at midheight of eye rather strongly convex; first segment 

 of fiagellum about 2.2 as long as wide in male, about 1.9 as long as 

 wide in female; mesopleurum polished, with rather coarse strong 

 punctm-es that vary from rather sparse to rather dense, usually also 



