L45 



(3). Larvae medium-sized, 15 — 18 mm long; case made of sand grains 



and detritus 3. Chaetopterygini Stein (p. 373) 



1. Tribe Limnophilini Kolenati 



Full-grown larva. Size varying. Head with pattern of stripes and spots. 

 Pronotum with dark stripe in groove in anterior third, sometimes without 

 a stripe. Tergites of metathorax distinct. Gills of anterior abdominal 

 segments with 2—3 filaments. 



Case made of detritus, coarse vegetable debris, sometimes bulky, 

 made of sand grains or mollusk shells. 



Mode of life and habitats. Usually in stagnant or slow-running 

 water. 



Distribution. Throughout the USSR. In addition, Europe, Asia, North 

 America. 



Key to Genera 

 Full-grown larva 



1 (6). Large forms, 32— 34 mm long; head and thoracic segments light; 



pattern consisting of dots or of dots and stripes; case made of 

 large fragments of leaves or stems, 40— 45 mm long; stagnant 

 water. 



2 (3). Frontoclypeus with dark, uniformly narrow, longitudinal stripe; 



dorsal stripes distinct, forming a characteristic horseshoe 

 pattern near coronal suture; case darsally and ventrally made 

 with large, rounded, longitudinally arranged, overlapping leaf 

 fragments which project laterally, or of thin, flat pieces of 

 detritus 1. Nemotaulius Banks (p. I8O) 



3 (2). Frontoclypeus with punctate pattern, sometimes with T-shaped 



pattern anteriorly, characteristic for Limnophilini. 



4 (5). Head slightly dark dorsally; punctation distinct only in posterior 



part; frontoclypeus with dark T-shaped pattern; case as in 

 Nemotaulius. 2. Glyphotaelius Steph. (p. 19l) 



5 (4.). Head with fine punctate pattern; dorsal stripes absent or barely 



visible; case made of spirally arranged large plant fragments . . . 

 3. Grammotaulius KoL (p. 194) 



6 (1). Medium-sized or small forms; head with pattern of dots or 



stripes and spots, or largely or entirely dark; case varying in 

 forna, made of detritus or sand grains. 



7 (10). Head with punctate pattern. 



8 (9), Pattern fine, distinct; punctation mainly fine, on light background; 



case made of longitudinally arranged pieces of detritus, with 



rough surface 7. Asynarchus McL. (p. 307) 



9 (8). Dots large, fused in some places, on dark background; case made 



of sand grains and detritus particles, including 1—2 large, 

 longitudinally arranged particles longer than the case itself .... 

 6. Anabolia Steph. (p. 295) 



179 



