Mode of life and habitats. Stagnant and slowly running, small 

 water bodies, usually swampy. 



Distribution. North and northwestern areas of the European 

 USSR, Siberia, the Far East. In addition. Northern Europe, North 

 China, North America (Alaska). 



6. Genus Senablis Fabricius (H ol o s t om i s Mannerheim) 



Full-grown larva. Length 25— 45 mm. Sclerites yellow or reddish 

 yellow, with dark pattern; abdomen pinkish during life. Head oblong, with 

 pattern resembling that of Phryganea and Agrypnia. Pronotum 

 without dark stripe at the anterior margin, or stripe interrupted in the middle 

 and not reaching anterior margin. Mesothorax with small median tergite. 



Coxae without ventral chaetoids. Femora as in Ph r y ga n e a, with 

 small, dark dorsal stripe. Fore tibia without distoventral process. Claw 

 of forelegs with adjacent light basal spine, claw almost as long as tarsus; 

 claws of mid- and hind legs shorter with normal basal thick spine. 



Claw of anal legs with 5 or 6 dorsal denticles. 



Case 40— 50 mm long, slightly curved, markedly narrower posteriorly, 

 made of large, regular fragments of plants arranged in rings. 



Pupa. Frontal sclerite slightly convex anteriorly, not darker than other 

 .p parts of head. Labriom wide, with relatively short anterior submarginal 



setae. Mandibles with rudimentary apex; dorsal tubercle near setae absent. 



Dorsal process of abdominal segment 1 with rounded apex. Gills 

 present on abdominal segments 2—8. Plates of holding apparatus on 

 segments 3—8 or only on abdominal segments 4—7; spinules more numerous 

 than in Phryganea (see p. 42). 



Case to 48 mm long, wide, made as by the larva. 



Mode of life and habitats. Stagnant and running water, including 

 humin-rich forest brooks in the plains, quarries and small, swam.py lakes; 

 among vegetation on the bottom. 



Distribution. Northern, northwestern, and central areas of the 

 European USSR, Siberia, the Far East, Sakhalin. In addition. Northern 

 and Central Europe, Mongolia, North China, Korea, Japan. 



Key to the Species 



Full-grown larva 



1 (2). Pattern of frontoclypeus in form of straight, narrow stripe. Dorsal 



bands narrow; pronotum light, with narrow, dark, oblique stripe in 

 each half 1. S. phalaenoides L. (p. 57) 



2 (l). Stripe on frontoclypeus wider posteriorly. Dorsal stripes wide. 



Pattern of pronotum different; dark, transverse stripe at anterior 

 margin absent 2. S. atrata Gm. (p.6l) 



56 



