(243^ 



4Z9 



FIGURES 427-430, Anabolia ne r v o s a Curt.; 



427— head, dorsal; 423 — pronotum ( A), mesonocum (B); 429 — tergite of 

 abdominal segment 9; 430 — larval case (427 - after Nielsen; 428- 

 430 — after Hickin). 



Pronotum and mesonotum (Figure 428) light yellow, with reddish brown 

 punctation; dark areas absent, except for a golden brown stripe in middle 

 of groove in anterior third; posterior margin of pronotum with dark reddish 

 brown stripes. Posterior margin of mesonotum reddish brown in middle, 

 yellowish laterally, broadly black at posterior angle; setae as in A. soror. 



Prosternite pentagonal, brown, with a dark spot in middle; horn grayish 

 brown. Mesosternites represented by a row of 4 reddish brown dots and 

 2 further dots behind row; metasternites similar but whitish. 



Legs yellow; coxae and femora with dark punctation, tibiae with less 

 distinct punctation; ratio of length of legs 61 : 100 : 99. Primary ventral 

 setae of fore femur in form of 2 short, light spines; posterior seta short, 

 darker than basal seta. 



Lateral line on segments 3 — 8. 



Tergite of segment 9 (Figure 429) brownish, with coarse punctation at 

 anterior margin; medioanal and anterior-angle setae long; intermediate 

 and lateral seta short, thin; a short, dark seta between medioanal setae. 



Sclerites "b" and "c" yellowish; setae as in A. soror. 



Claw of anal legs with a dorsal denticle; setae as in A. soror. 



Case tubular, 22 —26 mm long, made of sand grains, slightly narrower 

 posteriorly, with slightly flattened ventral side; walls covered with longi- 

 tudinally arranged rods which are sometimes 40 — 50 mm long (Figure 430). 



Mode of life and habitats. Feeding on diatoms, filamentous, 

 and other algae in vegetation on stones and tree remnants, some detritus 

 may be present in the food; species occurs in slow, clear water with a 

 current speed of 0.05 —0.2 m/sec, rarely 0.5 m/sec, often in spring-fed 

 brooks and canals, or in more sunlit streams with a summer temperature 

 of 18 — 20°; usually on a bottom of stone or sand with detritus. 



304 



