Dorsal process of abdominal segment 1 well developed; lateral processes 

 with small, pale sclerites. Ventral elliptical area on segments 2 — 7, those on 

 segment 2 smaller than others. Lateral line formed by small, grayish 

 hairs, extending from beginning of segment 3 to end of segment 8. Gills on 

 segments 2—7. 



Lateral presegmental gill of segment 2 usually absent or very small. 



Tergite of abdominal segment 9 (Figure 509) light brown, with brownish 

 punctation; medioanal and anterior-angle setae about the same length; 

 intermediate seta and lateral seta short, thin; a large, moderately long seta 

 situated between medioanal setae; surface with 3—4 relatively large, and 

 several small setae. 



Sclerite "b" of anal legs yellowish brown, with brown punctation, with 

 3 large distodorsal setae, a ventral, and 2—5 other setae. Sclerite "c" 

 yellow, with a dark seta. 



Claw yellow, with a dorsal denticle. 



Case (Figure 510) 20— 50 mm long, made of coarse pieces of detritus, 

 usually tree detritus, arranged obliquely or longitudinally; sand grains 

 sometimes present among detritus; large rods not always present posteriorly. 



Pupa.* Length 17 mm. Spinules of holding apparatus: 111:3; IV:4; 

 V:5 + 14-18; VI:4; V1I:4. Anal rods short. 



Sheaths of lateral appendages of male pupae much longer than penis 

 sheath. Case (according to Dohler) usually made of tree detritus. Nielsen 

 (1942:497) described a pupal case of H. digitatus made of sand, rounded 

 posteriorly with openings between sand grains, with a membrane anteriorly, 

 with several sand grains among numerous holes. Case attached at posterior 

 end to lower surface of stones by several short ligaments. 

 2 89 Mode of life and habitats. Clear brooks and small rivulets with 

 moderately rapid current; among vegetation on stones, on large branches 

 or pieces of wood, on sandy or silty bottom. 



Distribution. Northern and northwestern parts of the European 

 USSR, rare; Northern Caucasus. In addition, Europe, Iran. 



5. Genus Anisogamodes Marty no v 



Full-grown larva. Medium sized, 17—21 mm long. Head slightly oblong, 

 brown, with indistinct shaded pattern; punctation distinct. Pronotum and 

 mesonotum with a broad, light, longitudinal stripe along median suture. 

 Presegmental gills on abdominal segment 2 absent. 



Case made of detritus, with rough surface, with long rods projecting at 

 the end. 



Mode of life and habitats. On stony or sandy bottom;- open shore 

 of mountain lakes; near banks of mountain rivers. 



Distribution. USSR: Altai. In addition, Mongolia. 



1. Anisogamodes flavipunctatus Martynov 



Lepneva, 1949:171, 173-174, Figure 28. 



Full-grown larva. Length 17—21 mm. Head (Figure 511, A) slightly 

 oblong, i-atio of width to length 0.67; sclerites with small, blunt spinules 



"■ See Dohler, 1914:48-50. 



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