HYMENOPTERA 



919 



resemble the Gasteruptionidas, but they can be distinguished from 

 them by the presence of at least two closed submarginal cells in 

 the fore wings (Fig. 1155). 



This is a comparatively small family; some of the species are 



-Wings of A idacus. 



parasitic on saw-fly larv^ of the genus Xiphydria; but so far as is 

 known most of the species infest the larvae of Coleoptera. 



A monograph of the family is included by Kieffer ('12) in his 

 Evaniidae. 



Family STEPHANID^ 



The Stephanids 



In this family, as in the Trigonalidas, the abdomen is borne be- 

 tween the hind coxae, or on the end of the propodeum slightly above 

 them; but in this family there is only one closed submarginal cell in 

 the fore wings. 



This is a small family, which is represented in our fauna by but 

 few species; these are parasitic on wood-boring larvae. 



Family GASTERUPTIONID^ 



The Gasteruptionids 



In this family, as in the Aulacid^, the abdomen is borne on the 

 dorsal surface of the propodeum far above the middle coxae; but in 

 this family there are not two closed sub- 

 marginal cells in the fore wings. A striking 

 feature of this family is the fact that the 

 wings when at rest are folded longitudinally, 

 p- J ^ ^ as in the Vespidse, and in the genus Leucospis 



of the Chalcididae. Figure 11 57 represents 

 the venation of Gasteruption incertus. 



The family Gasteruptionids is represented in our fauna by the 

 genus Gasteruption of which twenty-two North American species 



