anterior-angle and medioanal, black, strong; other primary setae less 

 visible among secondary setae. 



Mesonotum (Figure 552, B) with reddish brown, anterior margin. 

 Lateral and posterior margin black, wider laterally and posteriorly; surface 

 with a large, reddish brown dot at posterior angle; 3 primary setae, 

 anterior -margin, anterior-angle, and medioanal, larger than others. 



Median tergites of metathorax large, anterior tergites triangular, with 

 dark anterior and median margin; posterior tergites lighter and smaller; 

 primary anterior-margin and medioanal setae moderately long, thick, dark 

 brown; a few thick, shorter, secondary setae. Lateral tergites situated in 

 middle with a large, dark reddish brown spot, 7 dark brown, large, thick setae 

 and several smaller light setae anteriorly (Figure 552, C). 



Horn thin, its chaetoids serrated (Figure 553). Forelegs (Figure 554, A) 

 slightly shorter than mid- and hind legs; fore femur wider basally, narrower 

 apically; legs and their chaetotaxy as in Figure 554, A. Fore femur ventrally 

 with 2 long, dark setae, one of them a primary anterior seta; primary ventral 

 setae of fore femur situated basally in form of 2 large, light spines; primary 

 ventral setae of mid -femur very long, thick, dark, spine -shaped (Figure 554, B) 



Abdominal segment 1 with large, atypically located, lateral processes; 

 a row of black setae situated on large brown sclerotized dots between them 

 ventrally. Lateral line on segments 3— 8, with small, dark hairs. Gills 

 single, on segments 2—7. 



Tergite of abdominal segment 9 brown (Figure 555); medioanal setae and 

 anterior-angle setae moderately long, black; intermediate seta also dark, 

 large; a similar, large, dark seta and a shorter, light one between medio- 

 anal setae; lateral seta light, shorter; several secondary setae of different 

 size near primary setae. 



Sclerite "b" of anal legs (Figure 556) short, chestnut brown, with 3 thick, 

 black, moderately long setae dorsally; ventral seta short, brown; other 

 setae of different size, situated apically and subapically. Sclerite "c" 

 relatively large, yellowish, with broad, black, lateral margin; basal seta like 

 ventral seta of sclerite "b," 



Claw brown, apex reddish brown, with a dorsal denticle; surface rugose, 

 with microscopic spinules basally; seta 3 dark, larger than the others. 



Case made of sand grains, slightly curved, narrower posteriorly. 



Mode of life and habitats. Rheophile, feeding on algae. Small, 

 rapid, cold brooks. 



Distribution. USSR: Carpathians and surrounding territory. In 

 addition, Europe. 



2. Genus Ecclisopteryx Kolenati 



Full-grown larva. Length 11 — 14 mm. Head yellowish brown; secondary 

 setae present in area of dorsal ridge. Pronotum concave anteriorly. 

 Anterior-median tergite of metathorax light brown. Case consisting 

 anteriorly of coarse sand grains, not smooth. 



Pupa. Length 9—14 mm; clypeus with large, tuberculate, dark brown 

 process. 



Mode of life and habitats. Cool, small, brooks and springs. 



Distribution. Southwestern part of the Furopean USSR. In addition, 

 Europe. 



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