Lateral line from middle of segment 3 to beginning of segment 8. 

 Gills single, only dorsal and ventral gills on segments 2—7; on segraent 

 2 close to posterior margin, on segments 3—7 presegmental and 

 postsegmental; lateral gills absent. 



Tergite of segment 9 brown; medioanal and anterior -angle seta 

 thick, long, blackish brown; intermediate and lateral seta thin, moderately 

 long; 5—7 short, thin secondary setae. 



Sclerite "b" of anal legs brown; a thick, long, black seta in the angle 

 between median and distal margin; 2 setae at inner margin, 3 at the distal 

 margin, outer surface with a group of 5—7 setae, ventral seta small, brown. 

 Sclerite "c" yellow, outer margin blackish brown, seta small. Claw 

 brownish, with a dorsal denticle. 



Case straight, cylindrical, with rough surface, made of sand grains and 

 small stones which project at some points; length 12— 14 mm. 



Pupa. Length 12.0— 12.5 mm. Antennae reaching end of segment 8 in 

 male pupae, end of segment 6 in female pupae, scape with small setae. Labrum 

 (Figure 12 5) light, rounded anteriorly; anterior -margin seta small, 

 transparent; 5 surface setae, long, golden brown, with hook-shaped end. 

 Setae of anteclypeus thin, relatively short, outer seta smaller than the 

 other 2. Mandibles (Figure 126) light brown; median blade coarsely 

 serrate, slightly convex in the middle, barely curved distally. 



Wing sheaths reaching segment 4 in male pupae, segment 3 in female. 

 Midlegs natatorial, setae grayish brown, on tarsal segments 1—4; 

 claw-shaped processes blunt, large, with microscopic spinules. 



Lateral line from end of segment 5 to 8; setae dense, grayish brown, 

 ventral ends close together in male pupae. Dorsal process of abdominal 

 segment 1 rugose basally, slightly sclerotized, yellowish, projecting 

 posteriorly in form of 2 short golden brown denticulate lobes; holding 

 apparatus on segments 3—7, presegmental plates small, yellowish, 

 postsegmental plates dark, transversely oval; spinules dark brown, numbers 

 as follows: 111:3-4; IV: 3-4; V:3-4+14-15; VI: 4— 5; VII: 3-4. 



Anal appendages (Figure 127) short, lobe-shaped, narrower distally, 

 curved laterally, with pointed, denticulate end; setae as in Figure 127. 



Case as in larva, straight, made of sand grains and small stones, 

 13 — 14 mm long, closed at each end by a dome -shaped membrane covered 

 with a mosaic of fine sand grains and with small holes between the grains. 

 Case attached to a stone by solid ligaments. 



Mode of life and habitats. Brooks, streams, and small, clear 

 „ mountain rivulets; on stones, in shallow water; this species is abundant 

 in the Altai in small, pure mountain rivulets flowing into Lake Teletskoe 

 (Korbu, Yan-Chili, etc.), in the Western Sayans and their foothills, rivulets 

 Olen'ye, Sobach'ya, Rudnaya, etc. 



Distribution. USSR: Sayans, northern and central Altai. 



3. Genus Ironoquia Banks (A 1 1 o p hyl ax Banks, 

 Caborius Navas) 



Full-grown larva. Length 15— 18 mm. Head and thoracic sclerites 

 light, with distinct pattern of dots. 



