930 



.l.V INTRODUCTION TO ENTOMOLOGY 



Wings of an aulacid. 



Coleoptera. All may be collected on the trunks of dead or dying trees 



but are seldom 

 common. 



Female aul- 

 acids have the 

 inner side of 

 each hind coxa 

 notched to 

 form a channel 

 for the guid- 

 ance of the ovi- 

 positor when 

 the coxae are 

 brought to- 

 gether over it. 

 It is interesting 



to note that the braconid genus Capitonius and the ichneumonid genera 

 Labena and Apechoneura have the hind coxas notched for the same 

 purpose. These genera further resemble the Aulacidae in having the 

 abdomen attached high on the propodeum and in being parasitic on 

 wood-boring Coleoptera. Apparently the habit of supporting the ovi- 

 positor between the hind coxae when it is in use has some causal con- 

 nection with the high attachment of the abdomen. 



Revisions of this family were included in their papers on Evaniidae 

 by Bradley ('08) and Kieffer ('12). 



Family GASTERUPTIID.^ 



The Gasteruptiids 



The family Gasteruptiidae, often spelled incorrectly Gasterup- 

 tionidae, resembles the Aulacidae and the Evaniidae in having the 

 abdomen attached high on the propodeum. 

 It differs from these families in having the 

 hind tibia bulbously swollen toward the tip 

 and in having venation like Figure 1157. 

 The front wing can be folded lengthwise. 



Figure 1156 represents a species of Gas- 

 teriiption, in which genus are included nearly 

 all of the twenty-odd North American members of the family. 



Fig. 1 1 57. — Wings of Gastertiption incertus. 



