Number and arrangement of gills of A.w a 11 e n g r e n i 



Segment 



Dorsal 



Ventral 



2 



1 



1 



1 



3 



1 

 1 



1 



4 



1 



1 



5 





1 



Primary basodorsal seta of hind coxa situated in a group of 11—13 

 secondary setae including several moderately long setae; 2 setae situated 

 more distally on the dorsal surface; 3 setae situated anteriorly near the 

 distodorsal indentation; the primary and one of the secondary setae markedly 

 long, nearly half as long as the coxa; 6—9 setae near the posterior margin 

 of the indentation, including one long primary and 2 secondary setae of 

 nearly the same size; anterior surface distally with 2 primary setae, 

 both of them short, thin, situated more proxinaally with 7—8 small, secondary 

 setae and a large seta; posterior surface with 6—7 short, secondary, short 

 and moderately long setae, 2—3 small setae ventrally; primary distoventral 

 setae short, anterior lighter and larger than posterior. Anterior seta of 

 trochanter short, light, thick, posterior seta brown, thin, longer than the 

 segment; basoventral seta light, grayish, thick, long; anterior ventral 

 setae in form of 2 light spines, one of them apical, the other nearer the 

 basal seta; posterior distoventral seta moderately long, less than half 

 as long as the posterior surface seta; subapical seta short, light, thick at 

 the base; a small secondary seta subventrally near the suture on the posterior 

 surface. Anterior primary seta of femur short, brown, thick, situated 

 apically, posterior seta situated subapically near the ventral margin, long 

 but shorter than the posterior seta of the trochanter; both primary ventral 

 setae situated in middle of segment (Figure 187, B), distal seta moderately 

 long, brown, proximal seta in form of a large, light, thin spine; anterior 

 and posterior surfaces with 3 secondary setae. Secondary setae of tibia 

 and tarsi situated singly on the dorsal and subdorsal surface. 



Lateral line on segments 3—7; hairs light, very short. Gills on segments 

 2-5. 



Tergite of abdominal segment 9 (Figure 188) pale grayish, brownish near 

 anterior margin; medioanal seta pinkish brown, thick, long, much thicker 

 and longer than the anterior-angle seta; 5 setae between the medioanal and 

 the anterior-angle setae, one of them sometimes as long as the anterior- 

 angle seta, the others short, thin. 



Sclerite "b" of anal legs slightly sclerotized, whitish, brownish near the 

 distal margin; median angle seta thick, dark reddish brown, neighboring seta 

 smaller, brown, as long as the medioanal seta of the tergite of segment 9; 

 lateral seta short, thin; subapical seta of inner margin moderately long, 

 both light brown; ventral seta small, light. 



141 



