seta 6 situated laterally in the distal part and shorter than seta 5; baso- 

 ventral seta 7 very short, small and thin; seta 8 normal, thick and light. 



Mode of life and habitats. Mountain and high -mountain brooks 

 and rivulets; common in mountain streams in Middle Asia. 



Distribution. USSR: mountains of Middle Asia. In addition, Iran, 

 Pakistan. 



FIGURE 308. Rhyacophila obscura Mart. Right anal leg, outer view 



5. Rhyacophila tristis Pictet 



Pictet, 1834; Plate XV, Figure 2. - Hagen, 1 864:143. - Ulmer, 1902c:492; 

 1903:128; 1903c:349. - Thienemann, 1905a:286. - Ulmer, 1909:220, 

 Figure 34.- Lestage, 1921:417, 419. 



Full-grown larva. Length 9— 10 mm. Pattern on head blackish brown. 

 Pronotum yellowish; dots indistinct. Claw of anal legs without spinules. 



Mode of life and habitats. Small brooks. 



Distribution. USSR: southwestern boundary areas of the USSR. 

 In addition, Europe. 



6. Rhyacophila philopotamoides McLachlan 



Thienemann, 1905:285-287, Figures 1,3,5.- Ulmer, 1909:320, 

 Figure 345, a.- Lestage, 1921:415-419.- Dohler, 1950:275. 



Full-grown larva. Length 9— 10 mm. Head light, yellowish brown, with 

 a distinct, rich, punctate pattern (Figure 309); stripes and spots on head 

 absent; the pattern consists of a transverse row of dots in the posterior 

 part of the frontoclypeus and several longitudinal rows of large and small 

 dots in the place of the dorsal and lateral stripes; ventral surface of head 

 light. 



297 



