FIGURES 822 and 823. Oecetis sp.l, larva nova: 



822 — pronotum (A),mesonotum f B),propleuron (C); 823 — pupal case 

 (A), posterior opening of case(B). 



Holding apparatus on segments 3 — 6; number of spinules: segment 111:2 — 3; 

 segment IV: 3— 4; segment V:3— 4 + 21— 23; segment VI: 3-4; spinules of 

 postsegmental plate in 2 rows, an anterior row of 10 — 11 large spinules and 

 a posterior .row of 1 1 — 12 small spinules. 



Processes of segment 9 large, each with 4 dark setae. 



Anal rods thin, long, thick at base, slightly curved between long, basal and 

 short, apical part, with hooked apex directed ventrally; 3 median spinules 

 516 between basal and apical part on right rod, 2 on left rod; apical part with 

 2 spinules on right rod, one on left rod; right rod with 3 light setae in basal 

 part and at beginning of apical part, left rod v/ith 4 such setae; 2 subapical 

 setae. 



Pupal case (Figure 823) shorter, almost straight, not tapering posteriorly 

 made of large plant fragments; posterior membrane with round hole. 



Mode of life and habitats. Lakes with brackish water, in 

 vegetation. 



Distribution. USSR: Middle Asia. Not recorded outside USSR. 



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