Dorsal sclerite of segment 9 mainly reddish brown, with a broad blackish 

 brown anterior margin and blackish brown anterior -angle processes which 

 cover the sides of the sclerite and partly its ventral side; lateral margin 

 concave; posterior margin with a deep median notch lateral to which are the 

 large whitish yellow, weakly sclerotized lobes of the posterior-angle region; 

 4 setae are present near the posterior margin of the lobes: long brown 

 medioanal setae, an anterior-angle seta and between them a small, thin, 

 light, intermediate and a lateral seta; a narrow reddish brown stripe at the 

 base of the medioanal seta. 



[242) 



FIGURES 238 and 239. Rhyacophila y am a nakens is Iwata: 



238 — left anal leg, outer view; 239 — part of left anal leg, outer and slightly 

 dorsal view (base of claw). 



242 



Anal legs (Figures 238 and 239) are moderately long. Dorsolateral 

 sclerite "b" yellow, with a broad reddish brown basal and median margin; 

 basal hook with a weakly curved, reddish end; ventral seta straight, light, 

 situated on a narrow brownish sclerite; there is a clearly marked oblique 

 groove which extends from the basoventral angle of the sclerite to the disto- 

 ventral angle; the short dorsal groove perpendicular to it is absent; lateral 

 margin of sclerite distally with a narrow sword-shaped process of slightly 

 different form from that in Rhyacophila s. str.; it is slightly bulb- 

 shaped at the base. The dorsal tubercle in the posterior part of the distal 

 part of the sclerite has a dark rounded apex; unlike in species of Rhy a - 

 co phi la s. str., both setae of the distal part are equally long; the seta of 

 the dorsodistal angle of the basal part of the sclerite is short. The seta 

 of the small ventral sclerite "c" is short and light; as in Rhyacophila 

 s. str., the lateral sclerite "c" is contiguous with the base of the sword- 

 shaped process at one point. 



The claw (Figure 238) is slightly longer than in Rhyacophila s. str; 

 its distal part has 4 larger ventral spinules; seta 1 in the basal part 

 is dark and long, almost 4 times as long as the short thin seta 2; seta 5 



255 



