yellow, thick; seta 3 situated subdoi'sally 

 in distal part, brown, moderately long; seta 2 

 lighter, yellowish, shorter, situated dorsally 

 at suture; seta 6 brown, thin, moderately 

 long, situated laterally at end of suture; 

 setae 7 and 8 situated basally, close 

 together, short, thick, light, seta 7 situated 

 ventrally; seta 8 more lateral and distal; 

 seta 5 small, light, situated near 8; seta 4 

 small, strong, light, situated medial to 

 seta 8. 



Case as in G. p i 1 o s a. 



Mode of life and habitats. Lake s 

 and rivers, close to the bank, on firm 

 bottom. 



Distribution. USSR: Altai, Sayans, 

 Eastern Siberia, north to the Upper Tunguzka. 

 Not known outside USSR. 



2. Genus Silo Curtis 



Full-grown larva. Length 7—9 mm. 

 Posterior part of frontoclypeus, in contrast 

 to G o e r a, narrow, short, much smaller 

 than anterior part. Tubercles of head and 

 thoracic sclerites larger, most of them flat. 

 Lateral tergite of mesonotum larger than 

 in Goer a and divided by a transverse 

 suture into 2 sclerites. Metanotum with 

 4 sclerites. Gills of pleural row absent. 

 Case usually with 3 small stones laterally; 

 these are rounded and less laterally 

 projecting than in G o e r a . 



Mode of life and habitats. Brooks 



with a bottom of stone or gravel, including mountain brooks with a rapid 



current. 



Distribution. The European USSR, including the Crimea and 



Caucasus. In addition, Europe, Southeast Asia, North America. 



FIGURE 574. Go era sa j a ne nsis Mart 

 Right legs, posterior: foreleg (A), midleg 

 (B),and hind leg (C) 



Key to Species 

 Full-grown larva 



1 (4). Head dark, brown or blackish; pronotum with 3 large, light, yellowish 



spots. 



2 (3). Dorsal side of head with dark brown, large, flat tubercles; spots of 



pronotum yellowish, oblong, distinct, lateral spots larger than median 

 spot 1. S. pallipes Fabr. (p. 417) 



416 



