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ENTOMOLOGICAL SOCIETY 



As a basis for a full understanding of the subject I will re 

 produce Westwood's characterizations of the ovipositor of 

 Pimpla, referring for illustration to my drawings of Pimpla 

 conquisitor Say (Fig. 8) : 



FIG. 8. Pimpla conquisitor : a, side view of abdomen, showing oviposi 

 tor partly extended ; b, anterior extremity of ovipositor and supports, 



showing method of attachment; c, ventral view of same 

 enlarged side view of eighth segment and ovipositor ; 

 same, with eighth dorsal arc removed, to show shape of 

 support and manner of attachment of the spicule- 

 plate to the latter all enlarged (original). 



d, 



' ' Figure (8) represents a lateral view of the abdomen of the 

 female, * * * exhibiting the eight dorsal arcs (numbered 

 i to 8), the seven basal ones being spiraculiferous, the eighth 

 furnished at the tip with two minute styles. On the under 

 side of the abdomen there only exists seven ventral arcs 

 (numbered i to 7), from the last of which arises on each side 

 a corneous elongate plate (9) which is the basal portion of the 

 outer sheaths of the ovipositor ; the apical part of these sheaths 

 varies greatly in length in the different species, but the articu 

 lation always takes place near the extremity of the body. 

 When at rest these two demi-sheaths (which are externally 

 convex and pilose, but internally concave and polished) are 

 brought into contact, and enclose between them the terebra 

 or borer itself, which is a compound instrument formed (like 

 the borer of Urocerus) of three parts, the superior (10) being 

 nearly cylindrical and channeled beneath for the reception of 

 the two slender, rigid, filamentous spiculae (n), with mem- 



