longer than apical spine. Distoventral seta of mid-femur (Figure 388, b) 

 in form of sharp, yellow spine as on forelegs; basoventral seta brownish, 

 thin, strong, spine-shaped, almost twice as long. Hind femur (Figure 388, C), 

 as in L. g r i s e u s, with 3 very long, thin, blackish brown, primary setae 

 (longer than femur), a primary, distodorsal seta, a posterior surface seta 

 and a distoventral seta; primary basoventral seta in form of a pointed, 

 yellow spine; primary posterior seta of trochanter also very long. 



Lateral line on abdominal segments 3—7; gills on segments 2—7. 



Tergite of segment 9 (Figure 389) brown, with large, light dots at 

 anterior margin; medioanal seta thick, long, black, or dark reddish brown, 

 longer than width of tergite; anterior -angle seta also large, dark, thinner, 

 and smaller; intermediate and lateral seta brown, short, thin; a short, 

 light seta between medioanal setae, displaced to the right. 



Sclerite "b" of anal legs chestnut brown; 3 posterior, distal setae 

 black or dark reddish brown; median seta large, thick, longer than others, 

 lateral seta moderately long, thinner; ventral seta short, brown; a thick, 

 brown, moderately long seta, and a short, thin seta at inner margin; surface 

 with 5 short, and 3—4, small setae. Sclerite "c" brown, with wide, reddish 

 black margin and a small, light seta. Claw reddish brown, with a large, 

 dorsal denticle, 1 or 2 small, thick spinules lateral to it; seta 3 thick, 

 darker than others. 



Number and arrangement of gills of Lvittatus 



Segment 



Dorsal 



Pleural 



Ventral 



2 



3 



3-1 





3-2 



3 





2 



3 



3 



3 



3-2 





3-2 



3 





2-1 



3 



4 



3-2 



2(0) 





2 



3-2 





1 



3-2 



5 



2 

 2-1 





1(0) 



2 

 2 



6 



2-1 







2-1 



1 (0) 







2-1 



7 



1 (0) 







2(0) 









1 (0) 



Case made of fine sand grains, conical, narrow, markedly curved; anterior 

 opening with deep ventral indentation and a small, dorsal indentation 

 (Figure 390); cases made entirely of shells of the rhizopod Difflugia 

 have been found in puddles (O. L. Kachalova). 



Pupa. Length 10—11 mm. Antennae reaching abdominal segments 7—8. 

 Mandibles with slightly convex median blade. Wing sheaths reaching 

 segments 4—5. 



277 



