Dorsal process of abdominal segment 1 large, pointed; lateral processes 

 blunt; ventral side with 2 small, brown sclerites close to middle. 



Lateral line on segments 3—8; hairs fine, brownish. 



Gills on anterior segments in form of thick, relatively long filaments; 

 dorsal and pleural gills absent from segment 6; ventral gills become smaller; 

 segment 2 without presegmental gills. 



Tergite of abdominal segment 9 chestnut brown, with pinkish punctation at 

 anterior margin; posterior margin darker than anterior. Setae dark bi'own; 

 medioanal setae long, thicker than others, antei-ior-angle setae thinner and 

 shorter; intermediate seta thin, moderately long, lateral seta shor-t; a similar 

 short seta slightly basal to it; a moderately long and a short, thin seta 

 between medioanal setae; surface with 2 — 3 small, secondary setae. 



Sclerite "b" of anal legs chestnut brown, with indistinct punctation at 

 anterior margin; setae dark brown; the median of 3 distodorsal setae long, 

 thick; neighboring seta almost the same, latei-al seta thinner and much 

 shorter; subapical seta at median margin similar; 2 thin, short, and a small 

 seta situated nearby or more basally; distoventral seta short, thin, dark; 

 surface with a brown, moderately long seta, and 5—6 small setae. 



Sclerite "c" light brown, with a short, strong, dark, basal seta, and reddish 

 brown, relatively narrow, lateral margin. 



Claw light brown, reddish brown apically, with a lai'ge, lighter, dorsal 

 denticle. Seta 1 situated subdorsally on inner side of basal part, strong, 

 dark; seta 3 moderately long, situated distally; seta 2 thin, brown, situated 

 dorsally above suture; seta 6 short, situated laterally near seta 2 and 

 distal to suture; ventral setae 7 and 8 light, lateral seta 5 shorter, thin, 

 situated near seta 8, basal to suture; seta 4 larger, situated distal to suture. 



Case (Figure 514) made of detritus, forming straight, cylindrical tube with 

 rough surface, sometimes slightly narrower posteriorly; surface covei-ed 

 with small particles of detritus, and also with lai'ger pieces, such as stalks, 

 large debris of trees or sticks, arranged along entire case and projecting 

 posteriorly. 



Mode of life and habitats. Open shore of lakes, sometimes 

 rivers (Lakes Teletskoe, Kochurlinskoe, Mul'tinskoe; Biya River); on 

 bottoms of stone, sand and stone, and sand and detritus. 



Distribution. USSR: Altai. In addition, Mongolia. 



6. Genus Micropterna Stein 



Full-grown larva. Length 16— 19 mm. Head almost uniformly brown; 

 pattern absent or indistinct;" pronotum lighter than head. Secondary setae 

 present ventrally and on anterior and posterior sides of femora. Dorsal 

 and ventral gills present on segments 2—7. 



Case made of sand grains and small stones of detritus, straight, slightly 

 narrower posteriorly, with rounded posterior end. 



Mode of life and habitats. Stony and sandy -stony bottom in 

 running water, small brooks, and rivulets. 



Distribution. The European USSR, including the Crimea and 

 Caucasus, Middle Asia. In addition, Europe, Algeria, Iran, Pakistan, India, 

 China. 



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