Full-grown larva. Length 16— 19 mm. Coloration very variable 

 (Figure 330, A); in light larvae, in which the pattern is more typical, 

 figure on frontoclypeus is narrower anteriorly, as in L. rhomb icus; 

 it is slightly dark laterally and reaches frontal sutures in dark specimens; 

 a more or less light, anterior, median indentation always present; posterior 

 end of stripe reaches margin. 



Dorsal stripes uniformly wide, extending from anterior to posterior 

 margin, transverse rows of dots lateral to coronal suture and posterior 

 part of frontal sutures; longitudinal rows of dots on site of lateral stripes; 

 a slightly dark, transverse stripe behind eye; ventral side mainly dark, 

 with large groups of dots on light background near occipital foramen, and 

 several, larger dots on dark background. Gula slightly brownish or lighter 

 (Figure 330, B). Median anterior -margin seta relatively large, slightly 

 shorter than intermediate seta; middle frontal seta longer than usual; 

 seta 14, like other large setae, black, much longer than 9; seta 15 thin, almost 

 as long as 9. 



Labrum as in Figure 330, C; dorsal sclerite yellowish brown, with a 

 dark spot near median pit. 



33! 



330 



FIGURES 330 and 331. Limnophilus ni g r i c e p s Zett.: 



330 - head, dorsal (A) and ventral (B), labrum (C); 331 - pronotum. 



196 



Mandibles black, with yellowish brown apex; left mandible distally 

 with 5 teeth, middle tooth the largest; ventral blade slightly concave, dorsal 

 blade slightly convex; right mandible with 5 teeth distally, the subventral 

 tooth larger than others, ventral tooth small, 3 dorsal teeth of same large 

 size; lateral setae situated basally, short, light, dorsal larger than ventral. 



245 



