large, much larger than posterior. Thorax, legs, and abdominal segment 1 

 with numerous, secondary setae. Lateral line on segments 3—7. Gills 

 single. 



Case conical, curved, narrower posteriorly, made of sand grains, with 

 smooth surface. 



F*upa. Head with tubercle or spine -shaped process on clypeus. Antennae 

 long, reaching end of body. Mandibles with short distal part; median blade 

 concave distally, serrated. Midlegs natatorial. Holding apparatus on 

 segments 3—7; lateral line on segments 5—8. Anal rods thin, straight, with 

 narrower, slightly curved end. Case with anterior and posterior membranes 

 covered with sand grains, with small holes between them. 



See Fischer on authorship of the subfamily (Trichopterorum Catalogus 

 Vol. VIII, 1966), who notes the priority of Banks (1916:117). 



Mode of life and habitats. On stones, in small, running water 

 bodies, springs; feeding on algae. 



Distribution. Western part of the European USSR, Caucasus. In 

 addition, Europe, Iran. 



Key to Genera 

 Full-grown larva 



1 (2). Length 10— 12 mm. Head blackish dorsally; secondary setae forming 



a dense crown or absent; pronotum flat anteriorly; anterior median 



tergites of metathorax dark brown or blackish 



1. Drusus Steph. (p. 389) 



2 (l). Length 13— 14 mm. Head reddish brown; small secondary setae 



present near the ridge; pronotum concave anteriorly; anterior 



median tergites of metathorax large, lighter, brownish 



2. Ecclisopteryx Kol. (p. 401) 



1. Genus Drusus Stephens 



Full-grown larva. Length 10—12 mm; head and pronotum black or 

 blackish brown. Secondary dorsal setae of head forming a corona or absent. 

 Pronotum flat anteriorly. Anterior-median tergites of metathorax dark 

 brown or blackish. Case smooth, made of fine sand grains. 



Pupa. Clypeus with large dark process. 



Mode of life and habitats. On stones, in brooks and rivulets 

 with cold water; springs. 



Distribution. Western part of the European USSR, Caucasus. In 

 addition, Europe, Iran. 



389 



