Tubercles of segment 9 with 3 — 4 setae. Anal rods (Figure 735) thinner 

 than in A. annulicornis, wide basally, tapering distally, curved apically; 

 a large, finely tuberculate area and a light, median process between basal and 

 458 apical part; setae situated subapically on curved apex of rod. Sheath of 

 male genitalia lobe- shaped, with concave median side; penis sheath short. 



Pupal case (Figure 736) 12 — 14 mm long, its large anterior opening 

 directed downward, closed by a membrane, and attached by ligaments on all 

 sides, except for a small anterior area, with curved, transverse slit near 

 margin; posterior end attached by a disk, posterior membrane exposed, 

 with transverse dorsal slit. 



Mode of life and habitats. Open littoral of lakes, in calm water 

 to slight surf, on solid bottom, on stones, snags, or plants, often in mucous 

 masses of diatoms or in sponges; also in slow rivers under similar 

 conditions. 



Distribution. Northwestern, western, and central parts of the 

 European USSR; Eastern Siberia. In addition. Northern and Central Europe. 



7. Athripsodes alboguttatus Hagen 



Krawany, 1937:1—6, Figures 1,2,4, 9, 11, 14. 



Full-grown larva. Length 11mm. Head (Figure 737, A) light, with oblong 

 dark dots in angle of frontoclypeus and lateral to epicranial suture.* Gula 

 wide, dark. Mandibles with 2 teeth on dorsal and ventral blade (Figure 73 7, B). 



139 



131 



1^0 



FIGURES 737-740. Athripsodes a Ibogutt at us Hag. (after Krawany): 



737 — head, dorsal fA), left mandible, dorsalCB); 738 -pronotum and mesonotum (schematic); 739 — larval 

 case (schematic); 740-pupa: left mandible, ventral (A), left anal rod (B). 



Pronotum whitish, without dark transverse stripe at anterior margin; 

 anterior margin light brown; posterior margin black. Mesonotum light, 

 with large, bracket-shaped, black streaks laterally, the indistinct brownish 

 stripe along median suture slightly darker anteriorly and posteriorly 

 (Figure 738). 

 459 Gills on segments 2 — 8. Claw small, strong. 



The drawing of Krawany given here is too schematic. 



574 



