(548) 



575 



811 



FIGURES 876 and 877. Sericostoma grusiense 

 Mart.: 



876 - head, dorsal (A) and ventral (B); 877 - group 

 of pupal cases (after Meshkova). 



Mode of life and habitats. Small rivulets on stony bottom, in 

 large aggregations; phytophagous, feeding on remains of plants and algae, 

 sometimes also on remains of animals, e. g., mayflies. An important 

 food of Sevan trout. 



Distribution. USSR: Caucasus. Not recorded outside the USSR. 



685 



