241 



UZit- 



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FIGURES 424-426. Anabolia sororMcL.: 



424 —tergite of segment 9; 425 — larval case; 426 — 

 dorsal process of abdominal segment 1 of pupa. (426 — 

 after Siltala). 



Case of full-grown larva (Figure 425) made of sand grains, sometimes 

 also with detritus, forming a straight tube with a slightly narrower posterior 

 end; case covered with rods which are longer than case (50 — 60 mm), and 

 which project markedly posteriorly and anteriorly; anterior opening 

 usually covered dorsally with a rod which is placed slightly obliquely and 

 reaches side of case at posterior end. 



Pupa. Length 15—17 mm. Antennae reaching abdominal segment 8. 

 Labrum with small median process, as in Limnophilus. Mandibles 

 with broad distal part; blade slightly convex, coarsely serrated; lateral 

 setae situated basally, short and about equal in size. 



Wing sheaths reaching abdominal segment 4. Midlegs natatorial; hind 

 tarsi with sparse setae. 



Posterior process of abdominal segment 1 large; lobes wide, with 

 numerous black spinules (Figure 426). Holding apparatus on segments 4 — 7, 

 segment 3 sometimes with a small plate with 1 —2' small hooks; number 

 of hooks: III: 0-2; IV: 2-3; V: 2-3 +9-15; VI: 2-3; VII: 2-3. 



Anal rods with numerous small spinules in middle and distally; 1st dark 

 seta situated in basal part, 2nd in about middle, 3rd and 4th apically and 

 subapically. Sheaths of ventral appendages of male pupa short, narrow, 

 not longer than wide, bifid penis sheath. 



Rods on case are shorter before pupation. Anterior end of case attached 

 to branches or large pieces of trees. Posterior membrane entirely sievelike, 

 anterior partly; both ends covered by plant or mineral particles. 



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

 lakes, on bottom in open, sandy-stony, or sandy littoral zone, on solid or 

 silty bottom in areas with open vegetation, also in brooks and rivulets with 

 slow current. This species is represented in lakes in Karelia in June by 

 young hibernating larvae, by full-grown larvae, pupae, and adults in 

 August. 



302 



