margin, two longitudinal stripes and a K-shaped figure in the middle of 

 the segment. The abdominal gills consist of a long process in the pleural 

 region of the segment which tapers to a cone and of an upward-curved 

 dorsal branch on the upper surface of the process, which gives a conical- 

 pectinate shape to the gill (Figures 223 and 224); the conical appearance 

 of the gill is especially well marked in ventral view. The anterior-angle and 

 medioanal setae of the dorsum of the abdomen are short and blackish brown; 

 the setae of the 8th segment are situated close to the posterior margin, on 

 a narrow, reddish brown, sclerotized stripe; between them, the sclerotized 

 stripe bears a short, thin intermediate and a lateral seta. 



(231) 



Wm/im 



i'.i 



FIGURES 222-225. Rhyacophila v i c ar i a Mart.: 



222 — mesothoracic gill; 223 — gill of abdominal segment 4; 224 — abdominal segments. 

 7—9 and the anal legs, dorsal; 225 — left anal leg, outer view. 



241 



