ICHNEUMONID FINAL INSTAR LARVAE — SHORT 495 



the labial sclerite is incomplete ventrally. The skin is lightly sclero- 

 tized with small projections and small setae. 



Larval Key 



1. Each lateral part of the labial sclerite with a small projection towards the 



median line Eiphosoma 



Each lateral part of labial sclerite without small projection towards median 

 line 2 



2. A very lightly sclerotized epistoma present . . . Zaleptopygus, Cremastus 

 Epistoma not sclerotized 3 



3. Hypostoma bent in the middle of its length Pristomerus 



Hypostoma bent at point one third of length from median end . Xiphosomella 



Pristomerus euryptychiae Ashmead differs from the drawing in figure 

 57a in that there are two groups each of two sensilla on the labrum. 

 Cremastus minor Cushman differs from the drawing in figure 58a in 

 that the ventral part of the labial sclerite is lightly sclerotized. 



It was not found possible to differentiate Zaleptopygus and Cremas- 

 tus on larval characters. 



The following have been examined: Pristomerus austrinus (Townes 

 and Townes), P. euryptychiae Ashmead, P. pacijicus appalachianus 

 Viereck, P. vulnerator (Panzer) (fig. 57a), Xiphosomella stenomae 

 Cushman (fig. 57b), Zaleptopygus flavo-orhitalis (Cameron) (fig. 57c), 

 Z. gallaecola (Cushman), Z. rosae (Cushman), Zaleptopygus sp., 

 Cremastus carpocapsae Cushman, C. epagoges Cushman, C. facilis 

 (Cresson), C ferrugineus Davis (fig. 58 a), G. forbesi Weed, C. minor 

 Cushman, Eiphosoma annulatum Cresson, E. hatatae Cushman (fig. 

 58b), E. insularis (Viereck), E. texanum Cresson. 



The following are figured in the literature: Pristomerus vulnerator 

 (Panzer) (Goidanich, 1931; Rosenberg, 1934), Zaleptopygus flavo- 

 orhitalis (Cameron) (Bradley and Burgess, 1934), Cremastus interruptor 

 Gravenhorst (Thorpe, 1930; Beu-ne, 1941). 



Tribe TersilocLini 



Figure 59 



This tribe, the larvae of which are endoparasites, resembles the 

 Cremastini and many Campoplegini in essential structure, but the 

 mandible is distinctive with its conical shape and small tooth at the 

 apex. The head sclerites are slender and lightly sclerotized. As in 

 most Cremastini, the stipital sclerite has no lateral expansion. The 

 labial sclerite is broader than long and is incomplete ventrally. The 

 ventral part of the prelabial sclerite is absent and several large sensilla 

 are present on the ventral edge of this sclerite. The maxillary and 

 labial palps are relatively large. The spu-acle is of the usual shape in 

 the Ophioninae with a lightly sclerotized closing apparatus adjoining 



