Number of gill tufts in A . cinereus (after Siltaia) 



Segment 



Dorsal 



Pleural 



Ventral 



I 





1 



1 



2 



2 



2 



1-2 



1 



1 1 

 1 1 



3 



1-2 

 1(0) 





1 1 

 1 



Number of gill tufts in pupa of A. cinereus (after Siltaia) 



Segment 



Dorsal 



Pleural 



Ventral 



2 



1(0) 

 1 



1 

 1 



1(0) ■'1-2 



1 1 



3 



1 





1 1 



1 



Gills on abdominal segments 1 — 3; segment 1 with a gill with a single, 

 thick filament before lateral process and a large presegmental gill with 3 

 thick filaments ventrally on each side; filaments of gills on segments 2 — 3 

 thin, 3 — 8 or more (to 17 filaments according to Siltaia) in a tuft. 



Tergite of segment 9 light brown, without dots; setae at posterior margin 

 brown, their position and size as in A. aterrimus. Setae of sclerite "b" 

 reddish brown. Claw with a dorsal denticle. 



Case made of sand grains, curved, with round cross section, 12 — 16 mm 

 long. 



Pupa. Length 11.0 — 12.5mm. Antennae of male pupae coiled about 3 

 times around body, those of female once. Labrum (Figure 713, A) with 

 rounded sides and large, pointed, median process; setae relatively long. 

 Blade of mandibles concave, serrated, with a small, tooth-shaped, basal 

 process (Figure 713, B). 



Wing sheaths reaching segment 6 or beginning of segment 7. Mid-tarsi 

 with dense natatorial setae. 



Gill tufts on segments 2—3. 



Presegmental plates of holding apparatus on segments 3 — 7 in form of 

 small, oval, light areas with large, dark brown, lateral hooks directed 

 posteriorly; median hook larger than lateral; postsegmental plates of 

 segment 5 oval, with 3 — 4 reddish brown spinules at posterior margin and 

 directed anteriorly. Anal rods with a dorsal tubercle at base with 4 large, 

 dark brown setae in 2 pairs, those of median pair larger than lateral setae. 

 Anal rods (Figure 714, A, B) straight, thin, slightly asymmetrical; a light, 

 large seta in basal third; a small light seta in middle near large tooth- 

 444 shaped process of left rod and near tuberculate processes of right rod; 



a strong, reddishbrown seta, and a small, light, spine-shaped seta subapically; 

 left rod also has an apical process, right rod 2 processes, one of them 

 apical, the other subapical; median process larger than others. Sheath of 

 penis and ventral appendages as in Figure 714, C. 



555 



