ICHNEUMON-ILIES — GELINAE : MESOSTENINI 487 



Key to the species groups and to the Nearctic species of Echthrus 



1. Apical margin of clypeus truncate, without a median tooth; nervellus broken 



far below the middle. Tuberculatus group (p. 487) . . (Not Nearctic) 



Apical margin of clypeus with a median tooth (varying from small to large); 



nervellus broken a little below, at, or somewhat above the middle ... 2 



2. Nervulus more or less basad of basal vein; clypeus with a large median tooth; 



apex of ovipositor sheath with a single terminal point. Abdominalis 



GROUP (p. 487) 1. abdominalis Cresson 



Nervulus usually at or distad of basal vein, but sometimes basad; clypeus with 

 a small median tooth; apex of ovipositor sheath with a pair of terminal 

 points. Reluctator group (p. 493) 3 



3. Apical 0.4 of clypeus weakly impressed, the apical margin with a moderately 



small median tooth, on each side of which the margin is impressed; second 

 tergite mat and weakly roughened; punctures on mesoscutum weaker, those 

 on the hind 0.3 rather indistinct; abdomen always black . 2. niger Cresson 

 Apical 0.3 of clypeus strongly impressed, the apical margin with a very small 

 median tooth; second tergite mat and smooth; punctures on mesoscutum 

 stronger, those on the hind 0.3 distinct; abdomen often partly or entirely 

 ferruginous 3. adillae Davis 



I. TUBERCULATUS GROUP 



Clypeus small, its apex truncate, without a median tooth; nervulus 

 basad of basal vein; neivellus broken far below the middle; ovipositor 

 tip with its lower valve hardly at all enclosing the upper valve. We 

 have no information about the armature of the apex of the ovipositor 

 sheath. 



This group includes Karaechihrus tuberculatus Uchida 1929, from 

 Sachalin and Siberia. Bioleter eos Meyer, 1930, is a synonym of 

 tuberculatus (new synonymy). We have seen the types of both 

 tuberculatus and eos and, according to our notes, they represent the 

 same species. 



II. ABDOMINALIS GROUP 



Cl3^peus large, with a large median apical tooth; nervulus basad of 

 basal vein; nervellus broken near middle or a little below; ovipositor 

 tip with its lower valve enclosing lower 0.3 to 0.5 of upper valve; 

 apex of ovipositor sheath with a single terminal point. Face of male 

 usually with a broad yellow or white mark on each side, beginning 

 near antennal socket and extending ventrally, often covering the 

 cheek; face of female entirely black or with some portion or trace of 

 the white markings of male, especially on cheek; thorax entirely 

 black. 



This group includes Echthrus abdominalis Cresson 1868, from North 

 America and E. rufijpes Uchida 1929, from Japan and Sachalin. 



