ICHNEUMONID FINAL INSTAR LARVAE — SHORT 



435 



O't m m 



Figure 19. — Cryptinae:Hemltelini, head sclerites: Stilpnus anthomyidiperda Viereck. 

 (1, antenna; 2, spiracle; 3, skin.) 



The following have been examined: Bathythrix sp. (fig. 14a), 

 Mastrus argeae (Viereck), M. molestae (Uchida) (fig. 14b), M. smithii 

 (Packard), Otacustes sp. (fig. 14c), Ethelurgus syrphicola (Ashmead) 

 (fig. 15a), Isdromas peruviana (Viereck) (fig. 15b), /. lycaenae (How- 

 ard) (fig. 15c), Thaumatotypus paradoxus (Zetterstedt) (fig. 16a), 

 Phobetes thyridopteryx (Riley) (fig. 16b), Gelis bruesii (Stricldand) , 

 G. tantillus (Cresson) (fig. 17a), Hemiteles areator (Panzer) (fig. 17b), 

 Endasys subclavatus (Say) (fig. 17c), Thysiotorus sp. (fig. 18a), Phy- 

 gadeuon subfuscus Cresson (fig. 18b), Iselix sp. (fig. 18c), Stilpnus 

 anthomyidiperda Viereck (fig. 19a), Atractodes sp. (GCV) (fig, 64a). 



Of these specimens, Mastrus molestae (Uchida) differs from the other 

 species of this genus examined in that the mandibular teeth are small 

 and are present only on the dorsal surface of the blade. M. smithii 

 (Packard) has one large sensillum and a group of smaller sensilla on each 

 maxillary and labial palp and M. argeae (Viereck) two sensilla. In 

 the two species of Isdromas examined the mandible is basically similar 

 and the ventrolateral part of each labial sclerite is expanded. There 

 are, however, many differences between these species. The larval 

 characters of Gelis, Hemiteles, and Endasys indicate a close relation- 

 ship. Members of the genus Gelis attack various small cocoons, 



