7. Group Hyporhyacophila Dohler 

 Dohler, 1950:275-276. 



Full-grown larva. Small or medium sized, 10— 18 mm long, of a different 

 habitus than in the groups described above; body uniformly broad in the 

 middle and less flattened. Mandibles massive; upper blades with distal 

 teeth. Dorsal setae of abdomen long. Tracheal gills absent. Anal legs 

 258 without sword-shaped process on the basal segment; seta 2 of the claw long, 

 sometimes massive. 



Mode of life and habitats. Brooks and rivulets, including very 

 small brooks with a moderately strong current. 



Distribution. USSR: Carpathians, Caucasus, mountain regions of 

 Middle Asia, southern and East Siberia, Far East. In addition, Europe, North 

 America, Asia. 



Key to Species 

 Full-grown larva 



1 (4). European species. 



2 (3). Head and pronotum light, with dark dots; claw of anal legs with 



small spinules . ... 6. Rhyacophila philopotamoides McL. (p. 297) 



3 (2). Head mainly dark brown; pronotum light, without dots; claws of 



anal legs without spinules ... 5. Rhyacophila tristis Pict. (p. 297) 



4 (l). Asian species. 



5 (10). Head slightly longer than broad, light, with dark pattern. 



6 (9). Forelegs shorter than midlegs and hind legs. 



7 (8). Pattern on head brown or light brown, more or less diffuse; dots 



on head and pronotum large, numerous and distinct 



1. Rhyacophila sibirica McL. (p. 275) 



8 (7). Pattern on head blackish brown or black; dots on pattern distinct; 



pronotum light yellow, without dots 



2. Rhyacophila narvae Navas (p. 281) 



9 (6). Forelegs longer and more massive than mid- and hind legs .... 



4. Rhyacophila obscura Mart. (p.29l) 



10 (5). Head oblong, narrow, dark, reddish-dark-brown, without pattern; 

 frontoclypeus with indistinct dots; pronotum dark brown, with 

 indistinct spots 3. Rhyacophila lata Mart. (p. 285) 



1. Rhyacophila sibirica McLachlan 



Lepneva, 1949:164-166, Figures 7-10. 



Full-grown larva. Length 18 mm. Ground color of sclerotized parts 

 yellow or reddish yellow, sometimes brownish; body slender (Figure l), 

 uniformly broad in the middle, tapering anteriorly and posteriorly. Length 

 of head capsule 1.7 mm, width 1.4 mm; eyes small, situated near anterior 

 margin of head. Frontoclypeus (Figure 2 74, A) dark anteriorly and at the 



275 



