Full-grown larva. Length 5.7— 10.0mm. Head, thorax, and abdominal 

 segments 1—8 more or less uniformly wide, in contrast to Apataniinae 

 (Figure 583); ventral inclination of head especially marked when anterior 

 343 part of larva is retracted in case (Figure 586). Head yellowish gray, with 

 a blackish tone; frontoclypeus with dark anterior margin; tentorial pits with 

 dark spot. Dorsal surface with large, dense tubercles. 



585 



587 



FIGURES 583-587. Silo nig ri c or nis Pict. (after Nielsen): 



583 - larva, dorsal; 584 - head, dorsal (A) and lateral (B); 585 - labrum (A), 

 left mandible, dorsal (B) and lateral (C), maxillolabium and gula (D); 586 - 

 head, thorax and abdominal segment 1, lateral; 587 - pronotum (A); same, 

 lateral, pleuron, base of coxa, and base of horn (B). 



429 



