posterior membrane with a cuplike swelling in middle of dorsal margin; 



the small, elliptical or almost circular, posterior opening, therefore, directed 



upward; thin anal rods of pupa often 

 project from opening in fixed material. 



Mode of life and habitats. 

 Vegetation of lakes and slow rivers; 

 open part of lakes with moderate surf, 

 among vegetation on solid bottom; large 

 pure ponds; inside sponges more 

 frequently than A. alboguttatus. 

 Distribution. The European 

 USSR, Western Siberia, Middle Asia 

 (Fergan Valley). In addition, Europe. 



2. Genus Horn ilia McLachlan 



The larva of one species is described 

 briefly. 



Distribution. The European 

 USSR, its central belt, and the Caucasus. 

 In addition, Europe, 



FIGURES 743 and 744. A t h r i p s o d e s 

 senilis Burm. Pupa: 



743— abdominal segment 5 and following 

 segments, dorsal (A), postsegmental plate of 

 abdominal segment 5 (B); 744 -anal rods, 

 lateral (A), case and disks, lateral(B), 

 posterior end of case , diagram (C) ( 743 , 744, C— 

 after Thienemann; 744, A, B — after 

 Klapalek). 



1. Homilia leucophaea Rambur 



Botosaneanu, 1955:793—795, Figures 

 3,4. 



Larva of an older stage. Head light 

 brown, without pattern. Mandibles 

 (Figure 745) short, with blunt distal tooth; 

 dorsal blade of both mandibles with 2 

 462 large teeth, ventral blade with 2 less prominent teeth, median depression with a 

 snaall brush consisting of several small chaetoids pointing in different directions. 



Pronotum light brown, as head; posterior margin black, wider laterally. 

 Mesonotum with large, black, bracketlike streaks at posterior angle, as in 

 Athripsodes annu li c o r n i s . 

 Gills present. 



Case (Figure 746) conical, slightly curved, compressed dorsoventrally, 

 with slightly flattened ventral side. 



Case fairly smooth, made of large and small sand grains, several larger 

 grains projecting laterally; anterior opening wide, almost ventral. 

 Mode of life and habitats. Springs, on solid bottom. 

 Distribution. Central zone of the European USSR, rare. In addition, 

 Europe. 



578 



