shorter; intermediate seta thin, long; lateral primary and secondary setae 

 short, thin; one, rarely 2 setae, between medioanal setae; surface with 

 4—5 small setae (Figure 502). 



Sclerite "b" of anal legs brown; both large distodorsal setae, a median 

 and a neighboring seta, long, black; lateral seta moderately long, thinner, 

 apical- ventral seta short, brown; subapical seta of median margin the same; 

 2 thin setae basally near margin; surface with 3—5 small, thin, additional 

 setae, rarely 9—10. 



Sclerite "c" brown, with black lateral margin, seta small, brown. 



Claw reddish brown, brownish apically, with a light brownish dorsal 

 denticle; seta 3 larger and thicker than others (Figure 503). 



Case made of detritus (Figure 504), with small, flat, approximately equal 

 and regularly arranged pieces, with smooth surface in more or less rapidly 

 2 85 flowing water; tube slightly curved; cases in calm water more bulky and 



covered with coarse tree detritus, some rods projecting beyond ends of case. 



Number and arrangement of gills of H. interpunctatus 



Segment 



Dorsal 



Pleural 



Ventral 



2 



1 

 1 



1 



1 





3 



1 

 1 



1 



1 





4 



1 

 1 



1 









5 



1 

 1 









6 



1 

 1 









7 















Pupa. Length 16— 2 mm. Antennae reaching abdominal segnnent 8 or 

 apex of rods. 



Labrum light bi'own dorsally; seta 1 small, dark; all 5 hooked setae 

 black, situated on a light spot. Mandibles brown, with dark brown apex and 

 serrated blade; lateral setae shoi-t, black, about the same length. 



Wing sheaths reaching middle of abdominal segment 4. Mid- tarsi with 

 i-ust- colored natatorial setae on first 4 segments; hind tarsi with sparse 

 setae on both sides of first 3 segments, only dorsally on segment 4. 



Dorsal process of abdominal segment 1 whitish yellow, streaked trans- 

 versely with dark brown posterior mai-gin; lobes of saddle -shaped process 

 with dark spinules including 3—4 larger spinules. Holding apparatus on 

 segments 3-7; number of hooks: 111:2-3; IV:2-4; V:2-4 + 12-14; VI:3-4; 

 VII:4. 



Anal rods relatively short, straight, slightly curved upward, with a 

 longitudinal row of minute spinules dorsally, terminal spines larger; 

 setae small, dark; basal seta thinner than others; raiddle, subapical and 

 apical setae large, dark brown, of similar length. 



357 



