margin of the basal part is a short seta which is strong and black, unlike 

 the two other species of the group. Claw with two ventral spinules in its 

 distal part; one of them is very small; ventral seta 8, which stands on a 

 tubercle, and seta 7 are situated in the basal part; both setae are light; 

 seta 4 is situated medially to seta 8; it is thin and light brown; dorsal short 

 seta 2 thin and dark; the other setae black, strong and thick; dorsal setae 1 

 and 3 are longer than the others; the outer seta 5 is almost the same as 

 setae 1 and 3, but thinner; seta 6 slightly shorter. 



FIGURE 234. Rhyacophila sp. "larva praebran- 

 chiata, " larva nova. Left anal leg, outer view 



Mode of life and habitats. Mountain brooks and rivulets with 

 a rapid current. 



Distribution. USSR: Talass Ala Tau in Central Asia; rare. 



239 2. Rhyacophila yamanakensis Iwata 



Iwata, 1927a:205, Figures 28-30. - Lepneva, 1949:164, Figures 4—6.* 



4th and 5th-stage larva. Length 10.4 mm (Figure 235). Head yellow, 

 with a reddish brown pattern; occipital foramen with a narrow, dark brown 

 margin. Sides of anterior part of frontoclypeus with narrow dark stripes; 

 posterior part of sclerite with a dark heart-shaped figure with a curved 

 row of dots. Dorsal and lateral stripes absent; 3—4 indistinct large light 

 brown dots laterally, along the coronal suture; ventral side of head without 

 dots. 



The outer and intermediate setae of the 3 anterior-margin setae lateral 

 to the frontal suture are light and small; the median seta is larger, curved 

 toward the margin of the sclerite; the anterior frontal seta is the same as 

 the above recumbent seta, and directed slightly obliquely; middle seta small 

 and light; posterior seta long and brownish; the other dorsal setae (unlike 

 Rhyacophila s. str.) are thin; their relative size is slightly different 



Described as Rhyacophila sp. 



251 



