small, dark, indistinct dots; lateral stripes the same. Ventral side, anterior 

 area on each side with a wide short dark stripe, continued posteriorly as 

 a group of dark dots (Figure 50). 



Number and arrangement of gills of D.obsoleta 



40 



41 



Segment 



Dorsal 



Pleural 



Ventral 



1 



1 





1 



2 



1 



1 



1 



1 



3 



1 

 1 



1 



1 



4 



1 

 1 



1 



1 



5 



1 

 1 



1 



1 



6 



1 

 1 



1 



1 



7 



1 

 1 



1 



1 



8 



1 

 







1(0) 







Labrum (Figure 51 ) as in A.pagetana. Dorsal blade of left mandible 

 (Figure 52, A) with 3 teeth in addition to terminal tooth, 2 large and one small 

 blunt tooth between them; dorsal blade of right mandible (Figure 52, B) with 

 one tooth, ventral blade with 2 teeth, one smaller, blunt, apical, and one 

 larger basal tooth. 



A dark transverse stripe in anterior third of pronotum (Figure 53) with 

 sharply defined posterior margin, in contrast to A.pagetana and A. p i c t a; 

 dark dots near margin in posterior part; blackish brown median spots near 

 base of suture. 



Legs as in Figures 54, 55, 56; chaetotaxy resembling that in 

 A. pag et ana. 



Gills on segments 1—8. 



Tergite of segment 9 (Figure 57) slightly dark near anterior margin, 

 with large dots. 



Anal legs and chaetotaxy as in A. p a g et a na. 



Case (Figure 58) 35 mm long, usually made of narrow plant particles 

 arranged in 9—10 turns of spiral. 



Pupa. Length 14— 15 mm. Mandibles slightly curved as in A. p a g et an a; 

 tubercle near setae higher. Gills present on segments 2—7, as in the 

 larva, segment 8 with only dorsal and pleural anterior -margin gills, but 

 no ventral gills. Number of spinules of holding apparatus: IV: 0—7; 

 V:5-10+9-18; Vl:7-13; V1I:6— 11. 



Anal appendages rounded posteriorly, ventral processes large (Figure 59), 

 penis sheath short. 



Case 25— 30mm or to 45 mm; anterior and posterior ends closed by 

 sievelike membranes with numerous holes. 



45 



