seta 16 short, cuj'ved; seta 17, as characteristic for the genus, thick, long, 

 blackish brown, longer and thicker than all other setae of the head; ventral 

 382 seta 8 small, brown, sti'ongj seta 18 minute, reddish. 



FIGURE 636. Ol i g o p 1 e c t r od e s potanini Mart. Larva in case, anterior (Aj, 

 head, dorsal (B) and ventral fCj, pronotuni (D) 



Labrum of characteristic form, small, short, narrower than anterior 

 margin of frontoclypeus; dorsal sclerite reddish bi'own, anterior margin 

 dark, with shallow median indentation; posterioi'- angle sclerites blunt, short, 

 with blackish brown basal spots. Seta 1 situated lateral to median inden- 

 tation in foi'm of a small, pointed, light, thick spine; seta 2 among hairs at 

 lateral margin, pointed, light; seta 4 similar, larger; seta 3 situated at 

 anterior angle, short, brownish; setae 5 and 6 situated on surface, larger, 

 reddish brown. 



Distal part of mandibles short, dentate, separated b}" a deep suture; 

 basal part reddish brown proximally, black at border with distal part; dorsal 

 blade of left mandible with 2 teeth in addition to median tooth; ventral blade 

 with a large and a small tooth; right mandible with 2 similar teeth on 

 ventral, and one on dorsal blade; latei-al setae situated basally, large, 

 close together, reddish brown. 



Sclerites of cardo mainly black, with black median process at anterior 

 margin; seta small, reddish brown, strong. Sclerites of submentum in form 

 of 2 large, transverse plates, brown in middle, reddish brown laterally; 

 setae dark brown, strong, moderately long; stipes mainly yellowish, with a 

 reddish brown median stripe; basal seta as on submentum; median distal 



479 



