92 PROCEEDINGS ENTOMOLOGICAL SOCIETY 



Male. A pupal envelop which contains a nearly fully colored adult 

 does not show, without dissection anything especially extraordinary. The 

 pupal envelop shows the thoracic structure of the female pupa, spines on 

 apical margins of tergites two to eight inclusive; and sternites two to 

 six inclusive. 



SUBORDER IDIOGASTRA, NEW SUBORDER. 



This suborder is proposed for the superfamily Oryssoidea as 

 defined by Rohwer in 1911 (Proc. Ent, Soc. Wash., vol. 12, no. 

 4, p. 217) and 1912 (Proc. U. S. Nat. Mus., vol. 43, p. 146). 



As a systematic division the suborder Idiogastra has long been 

 recognized but it is only comparatively recently (MacGillivray, 

 1906, Enslin, 1911, Rohwer, 1911, 1912) that it has been con- 

 sidered as an unusually well defined group. From the stand- 

 point of the adult this suborder is more closely allied to the Siri- 

 coid part of the Chalastogastra but it may be easily separated 

 from all the Chalastogastra by the marked reduction of wing 

 veins which resembles, except for the presence of a complete anal 

 cell, some braconids; 1 the curious position for the insertion of 

 the antennae, in which it resembles the Stephanidae; in the loss 

 of the metapostnotum in which it resembles the Clistogastra; in 

 the remarkable invaginated ovipositor, in which it is not ap- 

 proached by any other Hymenopteran; in the longitudinally 

 divided ninth and tenth tergites an analogy of which may be 

 found in some of the Clistogastra; and in the male genitalia 

 which more closely resemble those of the Clistogastra. From the 

 standpoint of the larva the Idiogastra are much more closely 

 allied to the Clistogastra and it is only with hesitancy that we 

 offer the characters in the following key, for it is certain that the 

 larvae of the Clistogastra are very imperfectly known and it is 

 possible that it will ultimately be found very difficult to separate 

 the suborders Idiogastra and Clistogastra on larval characters. 

 Briefly expressed the suborder Idiogastra stands intermediate 

 between the suborder Chalastogastra where the adult would 

 place it and the suborder Clistogastra with which the larva 

 would ally it. 



Adult characters: The face is prolonged below into a promi- 

 nent flange, below which the antennae are inserted, and which 

 extends laterally and posteriorly forming a scrobe for the recep- 

 tion of the basal part of the antenna; the antennae are inserted 

 below the lower eye margin; the clypeus is fused with the face 



1 In some braconids (Helconidea, etc.) two interanal veins are present 

 which if connected by the last apical abscissa of anal would make a wing 

 not greatly unlike Oryssus. 



