basoventral seta situated about in middle of claw, thin, straight, light, 

 reaching apex of claw. 



Abdomen flattened, as in Molanna. Segment 1 with large, high, dorsal 

 process; lateral processes displaced ventrally. Lateral line situated on 

 segments 3 — 7, consisting of short, dirty yellow hairs; segment 8 with 16 

 small, reddish, sclerotized dots, each with 2 small, light chaetae; 2 short, 

 dark, lateral setae situated behind dots. Anterior dorsal angles of 

 abdominal segments 2—8 with groups of 12—14 small, dense, sclerotized dots. 

 Gills presegmental, as in Molanna. 



Number and arrangement of gills of M. tincta (after Siltala) 



Segment 



Dorsal 



Pleural 



Ventral 



1 



2 







2 



2 





2 



3 



2 









4 



2-1 





1 



5 



1(0) 





1 



6 



1(0) 





1 



7 



- 





1 



Tergite of segment 9 indistinct, whitish, without secondary setae; 

 medioanal seta long, thick, dark brown; lateral seta and anterior-angle seta 

 dark, large, but shorter; intermediate and anterior-margin seta situated 

 close together, short, thin, light brown. 



Sclerite "b" of anal legs brownish; 3 posterior distodorsal setae long, 

 chestnut brown, thick; lateral seta also long, slightly thinner, curved inwards; 

 median surface with athick, short, dark brown seta asinM. submarginalis; 

 431 lateral part with groups of thin, dark brown setae, thinner and shorter than 



marginal setae (Figure 700). Sclerite "c" brownish, with a short, strong seta. 



Claw with 2 large, light, dorsal denticles at curvature; setae longer than 

 in Molanna. 



Larval case (Figure 701) 18 — 20 mm long, made of detritus or of sand and 

 detritus; wings of case narrow, anterior hood small, anterior opening of 

 tube sometimes close to anterior margin; ventral surface almost flat. 



Pupa. Length 10 mm. Antennae reaching end of abdominal segment 8, 

 sheaths of fore wings reaching beginning of segment 5. Labrum with 5 dark 

 and 1 light setae on each side. Blades of mandibles with small distal 

 denticles, partly serrated. Claws of legs rudimentary. 



Abdominal segment 1 with small spinules at posterior margin. Hooks of 

 holding apparatus: 111:2—3; IV:3— 4; V:3— 4 + 4— 5; VI:3— 4. Gills on segments 

 2 — 7 with 1 or 2 filaments, as in larva. 



Anal rods with 2 dorsal and 2 distal setae and numerous small spinules. 



539 



