seta situated subapically, dark brown, short, strong, posterior seta situated 

 ventrally, longer; anterior surface with 4—5 small, dark, secondary setae 

 in basal part, posterior surface with 6—7 larger setae; 4 short, strong, 

 reddish brown setae and 2 smaller setae, both primary setae among the 

 former, ventrally at margin. 



Tibia long, slightly wider distally. Tarsus almost straight, slightly 

 narrower distally. Dorsal setae of tibia in 2 pairs, longer than on forelegs; 

 distoventral setae in form of 2 light spines, smaller than on forelegs. 

 Dorsal setae or tarsus more widely spaced than on forelegs, thin, 

 314 light, of equal length; distoventral setae longer and thinner than on forelegs, 

 thin spinules near them. Claw thinner, curved, with yellow, basal seta. 



Number and arrangement of gills of D. caucasicus 



Segment 



Dorsal 



Pleural 



Ventral 





1 



1 





1 



2 













1 





1 



1 





1 



1 





1 



3 













1 





1 



1 





1 



1 





1 



4 













1 





1 



1 





1 







1 



5 



1 







1 





1 







1 



6 



1 







1 





1 







1 



7 



1 







1 





1 







1 



8 



1 







1 



Hind coxa (Figure 544, B) shorter than mid-coxa, with similar chaetotaxy. 

 Posterior seta of trochanter thin, moderately long, dark brown, intermediate 

 ventral seta small, light. Hind femur narrower and slightly shorter than 

 mid-femur, with slightly wider distal end; primary ventral setae in form of 

 thin, strong spines in middle of femur; a similar secondary seta further 

 distally. 



Hind tibia similar to mid-tibia. Subapical dorsal seta of hind tarsus 

 longer than apical seta. 



Dorsal process of abdominal segment 1 small, pointed; lateral processes 

 large, blunt; anterior dorsal part of segment with small, strong, black setae 

 on sclerotized dots; ventral convexity of segment brownish, with similar 

 setae and a reddish brown stripe at posterior margin. 



Lateral line from middle of segment 3 to beginning of segment 7, with 

 small, golden brown hairs. Gills on segments 2—8, single, long, ventral 

 gills longer than dorsal gills. 



Tergite of segment 9 (Figure 545) yellowish brown, with indistinct 

 punctation at anterior margin; medioanal and anterior-angle seta black. 



395 



