the sides and on the processes of the anterior angles; these angles are not as 

 projecting and long as in Rhyacophila impar; lateral to the light 

 median field, the sclerite is reddish brown; it is lighter toward the lateral 

 and posterior margin, brown and yellowish; median notch of the posterior 

 margin shallow; near the posterior margin of the lobes on the outer side 

 is a strong black long anterior-angle seta, displaced posteriorly, an inter- 

 mediate seta and a lateral seta which are thin and small. 



(237) 



FIGURE 233. Rhyacophila sp. "larva praebranchiata, " larva nova, lateral 



The basoventral hook of dorsolateral sclerite "b" of the anal legs 

 (Figure 234) is black at the base, pinkish at the end; a brownish sclerite near 

 the light ventral seta; the sword- shaped process of the sclerite is separated 

 at the base from the other part of the sclerite by a narrow light stripe; in 

 the distal part of the sclerite is a low dorsodistal tubercle with rounded 

 apex; 2 long black, thick setae in the middle and laterally; near the posterior 



250 



