Covering setae of abdomen of the same type reddish brown, small, sparser 

 than in Hy d ro p sy c h e, curved to surface; unlike in Hy d r o p s y c h e, their 

 base is very narrow; they are thin and pointed; blunt covering setae absent. 

 A remarkable character of the larva is the presence of thicker and darker 

 areas bordered laterally by rows of dense covering setae on the dorsum of 

 525) segments 6—8; these areas are rudiments of tergites and cover almost the whole 

 dorsum; they resemble the sclerites of meso- and metanotum; they have 

 similar, almost straight, anterior angles and broadly rounded posterior 

 angles; integument of these scleritelike areas soft but thicker than 

 integument of other parts of segment. 



Primary and secondary setae dark and light; most secondary setae small, 

 projecting; several setae dark, longer and thicker than the others; 2 such 

 setae in the anterior angle, 1 situated laterally, 1 (or 2) in the posterior 

 angle; posterior part of segment with 3 (sometimes 4 or 5) short, thin, 

 brownish setae (such setae absent on segment 8). Unlike in Hydropsyche, 

 ventral side of segment 8 without brown, triangular sclerites with long 

 covering setae. 



FIGURES 738 and 739. Macronema radiatum McL.: 



738 — apex of left anal leg, outer view; 739 — claw of anal leg: left claw, 

 outer view (A), right claw, inner view (B); seta 2 of claw of anal legs (C). 



Small segment 9 very narrow anteriorly, covered by the process of 

 segment 8, broader posteriorly, forming base for the anal legs; dorsal 

 surface slightly thickened; its greater part without covering setae; posterior 



5724 



600 



