in A. excisus); hind tibia with 6 spines, hind tarsus with 2 spines (7 and 

 3 in A. excisus). 



Dorsal process of abdominal segment 1 wide, with small, dark, median 

 setae; sclerite of lateral processes wide, black, almost straight basally, 

 slightly curved apically; terminal seta black, strong, moderately long. Gills 

 on segments 1—8, with 16—18 filaments. 



Tergite of segment 9 absent; 4 lateral setae near posterior margin, 

 including a long, black, medioanal seta, a similar anterior-angle seta, and 

 an intermediate and a lateral seta between them, both small, thin. 



(458) 



Number and arrangement of gills in A. fulvus (after Siltala) 



Segment 



Dorsal 



Pleural 



Ventral 



1 



1 





1 



1 



2 



9 



1 



8 



3 



3 

 2 





4 

 5 



4 



3 

 2 





1 



4 



5 



3 

 2 





1 

 3 



6 



2 

 2 





1 

 3 



7 



2 

 2 





1 

 2 



8 



2 



1 





1 



Sclerite "b" of anal legs with wide, dark brown, dorsal stripe, whitish 

 yellow laterally, with short, wide, dark brown margin at base of claw; ventral 

 side reddish yellow; 4 black setae dorsally near median stripe, 2 thick 

 and long, the other 2 strong, thin, moderately long; a similar thin, black seta 

 situated at base of lateral streak. Sclerite "c" reddish yellow, with a small, 

 thin, curved seta. Claw small, reddish brown, with a dorsal denticle. 



Case made of secretion, 14 mm long, conical, compressed dorsoventrally, 

 wide anteriorly, with a dorsal hood, narrow posteriorly, with a membrane 

 with a wide, round hole; fine sand grains sometimes present. 



Pupa. Length 9— 10 mm. Antennae of male pupae coiled about 3 times 

 around posterior end of body. Labrum without pointed median process; seta 

 situated in anterior part. Mandibles with almost straight, serrated area, 

 slightly curved distally. 



Wing sheaths reaching segments 7—8; midlegs natatorial. 



Posterior margin of abdominal segment 1 with brown, long, lateral, spinose 

 processes, as in A. excisus. Holding apparatus on segments 3—7; number 

 of hooks: 111:3— 5; IV:2— 5; V:4— 5+ 12—18; Vl:4— 5; VII:3— 5. Gills on 

 segments 2—8. 



573 



