245 



transverse sclerite; episternal seta yellowish, situated near the sclerite; 

 epimeral seta small, situated on a membrane posterior to the sclerite, near 

 the posterior margin of the segment. In the angle formed by the sclerites, 

 anterior to the transverse sclerite and lateral to the longitudinal sclerite, 

 is a club-shaped tubercle with a bifid apex; its position and form resemble 

 those at the base of the gills of species of Rhy ac ophila s. str. 



Forelegs thicker than mid- and hind legs; midlegs very thin, almost as 

 long as the forelegs; hind legs slightly longer; forelegs brownish; mid- 

 and hind legs yellow. 



FIGURES 244-248 . Rhyacophila impar Mart.: 



244 — right margin of pronotum, propleuron and base of coxa of foreleg, lateral; 



245 — mesopleuron and coxaofmidleg, dorsal; 246 —right foreleg (posterior 

 view) and propleuron; 247 —trochanter of left foreleg (anterior view); 248 — 

 left anal leg (outer view). 



259 



