203 



204 



ventral setae light, yellowish, represented by a short basal spine and a long 

 apical spine, which is almost as long as posterior, primary seta. Mid- 

 femur (Figure 348, b) and hind femur, rodlike, with straight, dorsal margin 

 and slightly concave ventral margin, wider distally, slightly longer than 

 hind femur; primary ventral setae situated in middle of femur, black, 

 moderately long, thin, basal seta slightly longer and thinner. Ventral setae 

 of hind femur (Figure 348, C) situated close together in distal half, strong, 

 black, apical seta long, basal seta shorter. Gills on segments 2—7. 



Tergite of segment 9 (Figure 349) pale, slightly pinkish near anterior 

 margin, with coarse punctation; medioanal setae black, long, longer 

 than twice the width of tergite, anterior -angle setae large, black, slightly 

 shorter and thinner; intermediate seta dark brown, moderately long; lateral 

 seta brown, thinner and shorter; seta between medioanal setae dark brown; 

 almost as long as intermediate seta, displaced to the left; 20—23 small, thin, 

 secondary setae on surface. 



Sclerite "b" pale, slightly brownish, with large, light brown dots dorsally 

 and laterally near anterior margin and on surface; setae black; medio - 

 distal seta long, almost as long as medioanal seta of segment 9, but slightly 

 thicker; neighboring seta almost as large; lateral seta thinner, of moderate 

 length; a black, moderately long, subapical seta near median margin and 

 a small, brown seta more basally; ventral seta short, black; surface with 

 one short, brown, and 3—4 small setae. 



Sclerite "c" yellowish, pale, with blackish brown lateral margin and a 

 short, black seta. Claw pale yellow, reddish brown apically, with a large, 

 thick denticle; a thick, small, light spinule laterally near the denticle. 

 Setae 1 and 3 dark brown; setae 2 and 6 brown; ventral setae 7 and 8 light, 

 straight, relatively short, seta 5 small, situated distally near seta 8; 

 seta 4 slightly larger, situated on inner side. 



Case (Figure 350) slightly or markedly longer than larva, 50— 55 mm 

 or longer, made of longitudinally arranged plant fragments, which sometimes 

 form an irregular spiral, resembling in this respect the case of Grammo- 

 taulius atomarius. Fragments of sedge or leaves of grasses, stalks, 

 long, fine particles of tree detritus, plant roots, etc., are used. Walls of case 

 smooth, fragments arranged densely, attached at anterior end only, posterior 

 end partly covering the following fragments. 



Nu 



Tiber and arrangement of 



gills of L. b 



Drealis 





Segment 



Dorsal 



Pleural 



Ventral 



2 



3 

 3 



3 



3-2 



3-2 

 3 



3 



3 

 3 



3 



2 



3 



3-2 



4 



3-2 



2 



2 



2-1 



3-2 

 3-2 



5 



2 

 2-1 



2-1 



1(0) 



2 

 2-1 



6 



2-1 

 1(0) 



1(0) 



1(0) 



2-1 

 2-1 



7 



2(0) 







2-1 

 1(0) 



254 



