side like the larval case and is attached by ligaments, which are broader 

 at the end and situated at the sides of the anterior and posterior end of the 

 case. 



Mode of life and habitats. Feeding on filamentous algae, in 

 plant thickets, mainly in lakes; also in slowly running rivers. 



Distribution. European USSR, Caucasus, Middle Asia, Siberia 

 (rarely in the extreme north). In addition, Europe, Iran, North America. 



Key to Species 

 Full-grown larva 



1 (2). Head yellow; two small dark spots, which are sometimes absent, 



between the eyes in the curvature of the frontal sutures; light spots 

 in posterior part of head indistinct. Dorsal sclerites of thorax 

 without dark spots; mesonotum darker posteriorly than anteriorly; 

 322 metanotum sometimes almost completely dark, except at the 



anterior margin 1. A. multipunctata Curt. (p. 353' 



2 (l). Darker than A. multipunctata; posterior part of dorsal surface 



of head (sometimes the whole frontoclypeus) grayish brown; a dark, 

 small spot in the curvature of the frontal sutures; a row of 4 dark 

 dots near the bifurcation of the epicranial suture; pronotum with 

 three dark spots; mesonotum and metanotum with one dark spot . . 

 2. A. pallidula McL. (p.363; 



Pupa 



1 (2). Distal part of mandible relatively broad, slightly curved; preseg- 



mental plates with 5—17 spinules; postsegmental plates with 



7—16 spinules 1. A. multipunctata Curt. (p. 353) 



2 (l). Distal part of mandible narrower and more strongly curved; pre- 



segmental plates of holding apparatus with 14—21 spinules and post- 

 segmental plates with 19—23 spinules . . 2. A. pallidula McL. (p. 363) 



1. Agraylea multipunctata Curtis 



Siltala, 1904b:6-10, Figure 1, a-o. - Thienemann, 1905b:547, 555, 

 Figure III. - Siltala, 1907:384-388, 392, Figure 3, a, b, f, g, d, n, o. - Ulmer, 

 1909:225, 293, Figures 351, e, 427, a. - Lestage, 1921:441-445, 

 Figure 140, a-h. - Lepneva, 1940:201-202, Figure 152.- Nielsen, 1948:41-62 ; 

 135-136, Figures 2, A, 3, A, 4, A, 6, A, F, 8-17, 51, F, G, 52A. 



Full-grown larva (Figure 388). Length at the beginning of the stage 

 2.7— 2.8 mm; at the end of the stage, 5.0—5.1 mm; ratio of length of head, 

 thorax and abdomen at beginning of stage 10:16.5:35; at the end of the stage 

 10:17.5:71. Head and prothorax equally broad; meso- and metathorax 

 slightly broader; first abdominal segment much broader than metathorax; 

 height of abdominal segments gradually increasing toward segments 4 and 5, 



353 



