Dorsal sclerites of segment 9 yellowish, thin, with indistinct dots near the 

 anterior margin; a reddish brown, thin seta near the posterior margin; 

 4 or 5 minute brownish setae in some places. Ventral plates of segment 

 large, brownish, covering greater part of segment, divided by a narrow 

 membranous stripe in the middle; surface with small, spinelike yellowish 

 covering setae; 12—14 large, reddish black setae near the posterior margin. 



Dorsolateral sclerite of section "b" of anal legs light brown, with sparse, 

 small, dark dots; basal margin of sclerite broadly black, brownish yellow 

 ventrally. Setae as in A. 1 a d og e n s i s; setae darker and fewer; setae of 

 posterior tuft less numerous and long than in A. ladogensis. Sclerite "c" 

 and claws similar. 



TABLE 13 



Segment 



Number of spines 











male 





female 



3 



0-7 





17-20 



19-20 





26-27 



4 



6-7 





11-12 



3-4 





- 



5 



6-7 





8-12 



16-20 





26-27 



6 



10-11 





15-15 



7 



10-12 





14-17 



8 



8-7 





12-14 



TABLE 14 



'Segment 



Male 



Female 













pleural 



ventral, lateral 



pleural 



ventral, lateral 



2 



_ 



6; 5+10 



_ 



9; 9+15 



3 [ 



- 



6; 10+12 



- 



7; 12+12-14 



8 



- 



8-10 







6 



11; 9+10 



6 



14+12 





6-7 



- 



9 



- 



5 1 



6 



10+11 



7 



12-13+14-15 





6-8 



- 



8 



- 



6 ( 



7 

 6-7 



} 5+11 



7 

 7 



| 10+10 



7 | 



- 



7+5 



- 



7+5 



8-9 



- 



11 



- 



542 



