ICHNEUMONID FINAL INSTAR LARVAE — SHORT 471 



contortionis Davis, L. eques (Hartig), L. lophyri (Ashmead), L. 

 ruficoxalis (Cushman), L. tsugae Cushman, L. virginianus (Rohwer) 

 (fig. 43a), Hypsantyx lituratorius (Linnaeus) (fig. 43b), Lophyroplectus 

 nipponensis Cushman (fig. 43c). 



The following are figured in the literature: Mesoleius tenthredinis 

 Morley (Beirne, 1941), Protarchus testatorius (Thunberg) (Beirne, 

 1941), Lamachus sp. (Morris, Cameron, and Jepson, 1937), Hypsantyx 

 lituratorius (Linnaeus) (Beirne, 1941), Lophyroplectus luteator (Thun- 

 berg) (Beirne, 1941). Beirne (1941, pp. 151, 153) figures lateral 

 projections on the labial sclerite in the region of the stipital sclerite 

 in Mesoleius and Lophyroplectus. These structures were not seen. 

 It is probable that lobes on the median end of each stipital sclerite 

 were mistaken for lobes on the labial sclerite. 



Tribe Euryproctini 



Figure 44 

 Larval Key 



1. Ventral part of prelabial sclerite absent Syoomelix 



Ventral part of prelabial sclerite lightly sclerotized 2 



2. Three sensilla on each labial palp Ipoctoninus 



Two sensilla on each labial palp Polytenis 



These three genera are very similar. 



The following were examined: Synomelix sp. (fig. 44a), Polyterus 

 olympiae (Ashmead) (fig. 44b), Ipoctoninus striatus (Davis) (fig. 44c). 



Subfamily Collyriiiiae 



Figure 45a 



Colly ria calcitrator (Gravenhorst) w^as examined. This is a very 

 isolated species with the larval characters showing no relationship 

 to those of any other ichneumonid. It is endoparasitic in the sawfly 

 Cephus. 



The lateral parts of the epistoma are very lightly sclerotized and 

 broad, forming plates on the lateral parts of the clypeus ; each pleuro- 

 stoma is lightly sclerotized and bears about five sensilla; there are no 

 other head sclerites : the maxillary and labial palps are represented by 

 small sensilla; there is no sclerotized silk press; about 12 sensilla are 

 present on the labrum; the mandibles are unsclerotized and are 

 without teeth; they can be detected in specimens cleared in Faure's 

 fluid, but must be stained in order to be seen clearly; the antenna is 

 disc-shaped; the spiracle has a long, thin -walled closing apparatus 

 with a length which is five to sLx times the depth of the atrium; the 

 skin is very smooth with small projections and small setae. 



504675—59 6 



