ICHNEUMONID FINAL INSTAR LARVAE — SHORT 413 



Tribe Theroniini 



Figure 9a 



The only species examined was Theronia atalantae (Poda) (fig. 9a), 

 The species of Theronia are usually primary and secondary parasites 

 of the pupae of Lepidoptera. 



The dorsal part of the epistoma is unsclerotized and the pleurostoma 

 is lightl}^ sclerotized; the hypostoma and hypostomal spur are slender 

 and well sclerotized; the stipital sclerite is lightly sclerotized and a 

 very lightly sclerotized cardo is present; the lateral parts of the labial 

 sclerite are slender and well sclerotized and the ventral part is broad 

 and lightly sclerotized ; each maxillary and labial palp has two sensilla, 

 one round and one crescentic in shape; the labral sclerite is present; 

 the mandible has a broad base and the blade is bifurcated with one 

 part bearing dorsal and ventral teeth and the other, which projects 

 posteriorly, being toothless; the antenna bears a small papillus; the 

 closing apparatus of the spiracle has slender walls and adjoins the 

 atrium; the skin bears setae approximately equal in length to that of 

 the toothed part of the blade of the mandible and has no spines. 



The mandible and the labial sclerite of the final instar larva of T. 

 atalantae are figured by Meyer (1922). 



Tribe Labenini 



Figure 9b 



The only species examined was Labena grallator (Say) (fig. 9b). 

 Species of the genus Labena parasitize wood-boring Coleoptera. 



The dorsal part of the epistoma is very faintly sclerotized; the 

 pleurostoma is well sclerotized and has a lightly sclerotized lateral 

 expansion; the hypostoma is well sclerotized and has a lightly 

 sclerotized posterior expansion; the hypostomal spur is well sclerotized; 

 the stipital sclerite is V-shaped with its lateral part expanded and 

 curved dorsally; the labial sclerite is similar in shape to that of many 

 Ephialtini, but there are no lobes on the ventral surface; on each 

 maxillary and labial palp there are two sensilla, both round and one 

 smaller than the other; the labral sclerite is distinctive with each 

 lateral part bearing a quadrate-shaped expansion and the median 

 (dorsal) part being unsclerotized except for a small, lightly sclerotized 

 plate; the antenna is papilliform; the atrium of the spiracle is oval in 

 shape and the closing apparatus is thick-walled and situated close to 

 the atrium; the skin has setae of moderate size but no spines. 



