ICHNEUMONID FINAL INSTAR LARVAE — SHORT 439 



The following are figured in the literature: Cubocephalus abdominator 

 (Gravenhorst) (Rosenberg, 1934), C. brumatae (Silvestri) (Silvestri, 

 1941), Aptesis basizonia (Gravenhorst) (Morris, Cameron, and Jepson, 

 1937). 



Tribe Sphecophagini 



Figure 21b 



Members of this tribe are parasitic in the nests of Vespula and 

 Polistes. 



The mandible is characteristic with its long slender blade bearing a 

 row of fine teeth along the entire length of the dorsal surface. 



Sphecophaga thuringiaca Schmiedeknecht (BM) (fig. 21b) and 

 Sphecophaga sp. (CD A) were examined. 



Sphecophaga vesparum (Curtis) is figured by Beirne (1941) and 

 Sphecophaga sp. by Snodgrass (1935). 



Tribe Cryptini (=Mesostenini) 



Figures 22-27 



Members of this tribe are parasitic mostly on pupae and prepupae, 

 or on larvae concealed in tunnels or leaf rolls. Hosts include Lepi- 

 doptera, Symphyta, Aculeata, and spider eggs. 



The larvae have the lateral parts of the epistoma well developed 



and, in many genera, the closing apparatus of the spiracle adjoins the 



atrium. 



Larval Key 



1. Epistoma lightly sclerotized, broad and complete Gambrus 



Epistoma lightly sclerotized, narrow and more or less incomplete dorsally . 2 



2. Labial sclerite with each ventrolateral part indented Trychosis 



Labial sclerite not of this form 3 



3. Closing apparatus of spiracle adjoining atrium 4 



Closing appratus of spiracle not adjoining atrium 10 



4. Dorsal part of labral sclerite expanded into three lightly sclerotized lobes. 



Cryptus 

 Dorsal part of labial sclerite not of this form 5 



5. Six setae on prelabium 6 



Four setae on prelabium 7 



6. Median-dorsal part of labral sclerite with lightly sclerotized enlargement. 



Goryphus 

 Median-dorsal part of labral sclerite without enlargement .... Mesostenus 



7. Dorsal part of labral sclerite divided into two lightly sclerotized bars. 



Polycyrtus 

 Dorsal part of labral sclerite not divided into two bars 8 



8. Mandible with a relatively slender blade bearing a row of fine teeth on the 



dorsal surface and teeth on ventral surface few and small . . Mallochia 

 Mandible not of this form 9 



504675—59 1 



