ICHNEUMON-FLIES, PART 2\ XORIDINAE 437 



subject of much disagreement, and the evidence of their relation- 

 ships is so inadequate or conflicting that we bring them together in 

 the Xoridinae with considerable hesitation. With the meager infor- 

 mation available, however, they seem better placed here than in any 

 other subfamily, unless each were placed in a separate subfamily of 

 its own. 



The Xoridinae seem to be more closely related to the Gelinae, 

 tribe Gelini, that to any other group. They differ from the Gelini 

 in lacking a long deep sternaulus (but the sternaulus is long in some 

 species of Xorides), having less regularly pentagonal areolet, first 

 abdominal segment straighter and with its spiracle usually at or in 

 front of its middle, and flagellum with a tendency to be less flexible 

 and sometimes weakly clavate. 



Key to the tribes of Xoridinae 



1. Abdomen attached high on the propodeum, in lateral view the lower edge of 



its socket considerably above upper edge of hind coxa; hind coxa of female 

 with a strong internal groove for holding the ovipositor. Western Hemi- 

 sphere and Australian region 2. Labenini (p. 530) 



Abdomen attached rather low on the propodeum, in lateral view the lower 

 edge of its socket below upper edge of hind coxa; hind coxa of female without 

 a groove on inner side 2 



2. Apical margin of clypeus truncate or a little concave, exposing most of labrum; 



apex of costellan vein with a row of about 6 strong hamuli. Australian, 



Neotropic, and Nearctic regions 3. Labiini (p. 537) 



Apical margin of clypeus convex, covering all but the apex of labrum; apex 

 of costellan vein with one or two strong hamuli, or in the Brachycyrtini 

 sometimes with several hamuli 3 



3. Areolet present; front and middle tarsal claws of female with an internal lobe. 



Australian region 4. Poecilocryptini (p. 541) 



Areolet absent; front and middle tarsal claws of female simple 4 



4. Thorax long, often somewhat depressed; spiracle of first tergite near its middle. 



Worldwide 1. Xoridini (p. 437) 



Thorax very short and high ; spiracle of first tergite near its apical 0.35. World- 

 wide 5. Brachycyrtini (p. 541) 



1. Tribe Xoridini 



Figures 304,b-306,a 



Front wing 2.8 to 25 mm. long; clypeus covering most of labrum, 

 its apical margin thin, convex in outline; flagellum filiform, rather 

 flexible, tapered apically or in some females of Xorides thickened at 

 the tip; thorax elongate, depressed or cylindric; abdomen attached 

 low on propodeum; female hind coxa without an internal groove for 

 holding ovipositor; tarsal claws simple; areolet absent; apex of costel- 

 lan vein with one or two hamuli; spiracle of first abdominal segment 

 at or in front of the middle. 



