97 



198 



row of 4—5 pale, pinkish brown dots. Metasternites represented by 3—4 

 whitish dots. Horn narrow, yellowish (Figure 332). 



Posterior subventral seta of fore femur situated between primary ventral 

 setae nearer to the basal seta. Hind trochanter basally with a long, 

 posterior, primary seta, and 2 small, secondary setae. Other setae as in 

 Figure 333. 



Lateral line on segments 3—8. Gills on segments 2—8. 



A special characteristic of this species is the absence of the pleural 

 presegmental gill on abdominal segment 2; there are rarely, e, g., in Lake 

 Teletskoe on the Altai, specimens with small, rudimentary, presegmental, 

 pleural gills on one or both sides of segment 2. 



Tergite of segment 9 light brown, with indistinct punctation near posterior 

 angle. Setae black; medioanal seta thick, long; anterior -angle seta thinner 

 and markedly shorter; intermediate and lateral seta thin, the former 

 moderately long, the latter short, yellowish; seta between medioanal setae 

 black, strong, moderately long; 2 small, dark setae on surface. 



Sclerite "b" of anal legs brown, with indistinct punctation; setae black; 

 mediodistal seta thicker and longer than other 2 distal setae; ventral 

 seta moderately long; 3 setae, one moderately long, the other 2 short, at 

 median margin; surface with 6—7 small, thin setae. Sclerite "c" yellowish, 

 with broad, black, lateral margin. Claw with relatively long, basal part; 

 mediodorsal setae 1 and 3 dark brown; dorsal seta 2 thin, moderately 

 long; seta 6 short, brown; seta 8 situated closer to 7, both yellowish; 

 setae 5 and 4 situated more distally, 5 small, situated laterally near 8; 

 4 situated medially, slightly larger. 



Case straight, 20— 25 mm long (Figure 334) made of plant particles, often tri- 

 hedral; longplant particles are arranged longitudinally in cylindrical cases; 

 1—2 longer stalks sometimes project beyond end of case; sand grains 

 are sometimes used (Lepneva, 1949:169—170). 



F*upa. Length 11— 15 mm. Antennae reaching abdominal segment 8 or 

 end of body. Labrum with small median process. Mandibles with relatively 

 broad distal part. 



Midlegs natatorial with setae on tarsal segments 1—4; hind tarsi with 

 sparse setae on segments 1—2. 



Number and arrangement o 



gills of L. ni 



griceps 





Segment 



Dorsal 



Pleural 



Ventral 



2 



3-2 

 3-2 





3-2 



3-2 

 3-2 



3 



3-2 

 3 



2 



2-1 



3-2 

 3-2 



4 



3-2 

 2-3 



1 



1(0) 



3-2 

 2-1 



5 



2 

 2-1 



1(0) 



1(0) 



2 

 2 



6 



2-1 



1(0) 



1(0) 



2-1 

 2-1 



7 



2-1 

 2(0) 







2-1 

 1(0) 



8 



1(0) 







1(0) 



247 



