median seta and lateral seta subapical^ short, reddish brown. Sclerite "c" 

 relatively large, yellowish brown, with a small, light seta. Claw small, with 

 2 small denticles (Figure 722); small, light seta 1, long,, thick, median 

 seta 3, large, brownish seta 2, and short, lateral seta 6 are distinct. 



Number of filaments in tufts of gills of pupa of 

 A . e X c i s u s Cafter Siltala) 



Segment 



Dorsal 



Ventral 



2 



6 

 4 

 6 



7 8 



3 



7-11 



7 



7 4-6 



4 



6 



7 3-7 



5 



6 



5 



6 



5-7 



3 



7 



3(0) 



3- 



-4 



Case (Figure 723) made of sand grains, 9 — 11 mm long, in form of a 

 wide cone, flattened dorsoventrally, with large, anterior opening and very 

 narrow posterior part; ventral surface flat, made of fine sand grains; 

 lateral and dorsal sand grains much larger; wide, hoodlike anterior part 

 sometimes with a larger sand grain laterally, or with several grains, 

 giving a winged appearance. Posterior membrane directed downward, 

 with a round or elliptical hole. 



Pupa. Length 6 — 8mm. Antennae coiled several times around posterior 

 end of body. Labrum shorter and wider than in aterrimus group, and 

 with a small, median process. Blade of mandible with an almost straight 

 serrated part (Figure 724). 



Sheaths of fore wings reaching abdominal segments 7 — 8. Mid-tarsi 

 with dense setae. 



Abdomiinal segment 1 with large, projecting, dorsal processes laterally 

 (Figure 725); sclerotized area with spinules directed posteriorly; area with 

 spinules directed anteriorly situated on an elevation. Hooks on plates of 

 holding apparatus: 111:2—3; IV:2— 3; V:2— 3 + 10— 14; VI:3— 4; VII:2— 4. 



Dorsal tubercles of segment 9 with 3—4 dark setae. Anal rods 

 (Figure 726) straight, thick, narrower distally, hooked at end; inter- 

 mediate part of rod with a tuberculate median area with one large, and 

 2 small, denticles; basal seta short; middle seta moderately long; both 

 apical setae small, situated on sides of curved apex. Sheath of male 

 genitalia narrow, pointed, curved inward. 



Case slightly shorter than in larva; anterior opening directed ventrally; 

 membrane with a transverse anterior slit; posterior opening with a 

 broadly elliptical transverse slit; anterior end of case attached at several 

 points by ligaments; posterior end by a small disk. 



565 



