39 



111:3-5; IV:6-8; V: 6-1 1 + 15-25; VI:9-13; VII:10-16; VIII:5-13. 



Anal appendages slightly wider; ventral processes of male genitalia 

 larger at the base than in Ph. bipunctata. 



Case 50— 60 nam long, sometimes only 30 — 35 mm, and with only 5—6 coils 

 in spiral; pupa sometimes situated in a reed fragment (Siltala, 1904a: 

 147-148). 



Mode of life and habitats. Stagnant waters among vegetation. 

 Recorded from freshened part of the Gulf of Finland. 



Distribution. USSR: European part. In addition, Europe. 



4. Genus Dasystegia Wallengren 



Full-grown larva. Length 22— 27mm. Pattern of frontoclypeus formin| 

 a straight, narrow, dark stripe, as in P h r y g a n e a. Head ventrally with 

 dark stripes and spots. 



Mode of life and habitats. Among vegetation or on the bottom. 



Distribution. USSR: European part, Transcaucasia, Siberia. In 

 addition, Europe, Iran, Mongolia, China, Japan, North America. 



Key to Species 

 Full-grown larva 



1 (2). Head ventrally with short dark parallel lateral stripes 



1. D. obsoleta Hag. (p. 44) 



2 (l). Head ventrally with a large dark spot on each side 



2. D.varia Fabr. (p. 47) 



Pupa 



1 (2). Abdominal segments 6—8 with a dorsal row of gills 



1. D. obsoleta Hag. (p. 44) 



2 (l). Dorsal row of gills on abdominal segments 6 — 8 absent 



2. D. varia Fabr. (p. 47) 



1. Dasystegia obsoleta Hagen * 



Siltala, 1902:19-22, Figure 4.- Ulmer, 1903:39, Figure 47.- Siltala, 

 1904c:15; 1907:428, 430.- Ulmer, 1909:239, 303, Figure 443b.- Lestage, 

 1921 : 591.- Lepneva, 1940:208.- Hickin, 1955:55-58, Figures 1, 2,4, 6. 



Full-grown larva. Length 24— 2 7 mm. Resembling A. p a g e t a n a in 

 form of body (Figure 49), coloration of sclerites, and other characters. 

 Head with characteristic pattern. Median pattern of frontoclypeus in 

 form of straight, narrow, clearly defined dark stripe, crossed by a curved 

 row of dots. Dorsal stripes of head (Figure 49) narrow, distinct, with 



* See Fischer, 1964. Trichopterorum Catalogus, V: 26— 34. It appears in the literature as Phryganea 

 obsoleta Hag., Prophryganea obsoleta Hag., Agrypnia obsoleta Hag. 



44 



