dots; smaller dots lateral to coronal suture. Ventral side of head brown, 

 including gula, and without dots (Figure 715, B). 



Number of gill tufts in A. bilineatus ( after Klapalek) 



Segment 



Dorsal 



Pleural 



Ventral 



1 





1 



3 



2 



1 



1 



2 



1 



1 1 



1 1 



3 



1 

 1 



1 



1 1 

 1 



Labrum with deep median indentation, as in A. cinereus. Both 

 mandibles with 2 teeth on dorsal blade and one tooth on ventral blade. 



Pronotum and mesonotum yellowish brown, without dots (Figure 716, A); 

 mesonotum with blackish streaks in posterior angle. Propleuron as in 

 Figure 716, B. Legs light yellow. 



Abdomen whitish; black sclerotized rod at base of lateral process of 

 segment 1 simple, without branches (Figure 716, C). 



Gills on segments 1—3; as in A . c i n e r e u s , segment 1 with 1 short, 

 thick, lateral filament presegmentally, with a gill with 3 short thick filaments 

 ventrally. 



Tergite of abdominal segment 9 light, indistinct, without dots; setae as 

 in A. cinereus but lighter and brown. Claw with one denticle. 



Case 9 — 11mm long, made of sand grains, curved, with round cross section 

 (Figure 717). 



Pupa. Length 7 — 8 mm. Antennae of male pupae coiled 2.5 times around 

 body, antennae of female 1.5 times. Labrum with indistinct anterior angles 

 and a small, blunt, median process. Mandibles without tooth-shaped process 

 at base of serrated blade. Wing sheaths reaching base of segment 6. 

 Midlegs natatorial, with dense, thin, golden setae. 



Abdominal segment 1 with a process with spinules directed posteriorly, 

 and an area with minute spinules directed anteriorly; presegmental plates 

 of holding apparatus on segments 3— 7, with 2 hooks; postsegmental plate of 

 segments 5 oval, light, with 3 — 5 spinules directed anteriorly. Lateral line 

 on segments 3—8, with dense, grayish white setae. Dorsal gills absent; pleural 

 and median ventral gills at anterior margin of segments 2—3; lateral ventral 

 gills anteriorly and posteriorly on both segments. Dorsal tubercles with 4 

 thick, black setae on each side about in middle of segment 9, as in 

 A. cinereus; 4 ventral setae at base of each rod. 

 445 Anal rods thin with 2 small denticles ventrally in the second third of the 

 rod, a large tooth on the inner side and distally; basal part with a light 

 seta, apical part with a dark, strong, lateral seta, both setae large; median 

 side with a small, light seta in middle third and a similar seta at apex. 



Case shorter than in larva; anterior and posterior membranes convex, 

 covered with sand grains; anterior hole round, posterior hole elliptical. 



Mode of life and habitats. Small brooks, on stony bottom. 



557 



