(260) 



FIGURES 276-280. Rhyacophila sibirica McL.: 



276 — mandibles, dorsal: left mandible (A) and right mandible (B); 277 — gula and maxillo- 

 labium; 278 — pronotum; 279 — dorsal sclerite of abdominal segment 9; 280 — right anal legs, 

 outer view. 



Propleuron broadly black in the middle of the basal part, brown in the 

 epimeral and episternal regions; episternal sclerite yellowish; the membranous 

 groove separating it is continuous; the integument of the groove is thick; 

 trochantin reddish brown, with dark margins; distal seta strong, dark, 

 relatively large; setules light, one of them slightly larger and thicker; 

 epimeral seta small and situated on a membrane. The longitudinal pleural 

 sclerite of meso- and metanotum is rodlike and very narrow; the seta is 

 dark, relatively long, situated near the distal margin of the plate on a small 

 sclerotized dot; the transverse sclerite is broad, brownish and black in the 

 distal part; epimeral seta small. 



278 



