ICHNEUMONID FINAL INSTAR LARVAE — SHORT 419 



the anterior pleurostomal processes; the pleurostoma is hghtly scler- 

 otized; the hypostoma, hypostomal spur and stipital sclerite are well 

 sclerotized; the labial sclerite is well sclerotized and the lateral parts 

 meet the ventral almost at right angles; a prelabial sclerite is present; 

 each maxillary and labial palp bears two sensilla, one round and 

 one crescentic in shape; the mandibles are distinctive, being large 

 with a long broad blade having a row of fine teeth on the dorsal edge ; 

 the labral sclerite is absent; the antenna is papilliform; the closing 

 apparatus of the spiracle is long and slender and is separated from the 

 atrium by a length of trachea equal in length to the atrium ; the skin 

 bears small setae but no spines; small bubble-like projections are 

 present on the skin, but these are not pointed and sclerotized as in 

 the Tryphoninae and cannot be called spines. 

 Beirne (1941) figures Adelognathus sp. indescr. 



Subfamily Tryphoninae 



Figures 11b-13d 



Members of this subfamily are ectoparasites and the tribes are 

 closely related. The eggs are attached to the skin of the host by a 

 stalk (by other structures in some Cteniscini) and the parasite larva 

 completes its development in the host cocoon. 



The head sclerites are all well developed, although the epistoma is 

 only slightly sclerotized in the Phytodietini and the prelabial sclerite 

 is absent; the mandibles are of moderate size and may bear teeth on 

 the dorsal edge of the blade or teeth may be absent; the antenna is 

 disc-shaped with one to tliree sensilla in the center; the closing ap- 

 paratus of the spiracle is slender and is situated some distance from 

 the atrium, except in Netelia where the closing apparatus is as broad 

 as the atrium and adjoins the atrium; large setae and small spines 

 a-re present on the skin, except in Exenterus where the spines are 

 conspicuously large and are about half as long as the setae. 



Larval Key 



1. A lightly sclerotized plate is present on the labium ventral to the labial sclerite. 



Phytodietini 



A lightly sclerotized plate is not present on the labium ventral to the labial 



sclerite 2 



2. Dorsal part of epistoma unsclerotized Idiogrammatini 



Dorsal part of epistoma sclerotized 3 



3. Labial sclerite slender with width much less than that of stipital sclerite. 



Boethini 



Labial sclerite relatively broad with width approximately equal to that of 



stipital sclerite 4 



