Sclerite "b" of anal legs, brownish, with large, darker dots; 2 long, thick 

 setae, 2— 3 moderately long, black setae and 10—12 short and small setae at 

 posterior margin. Claw with large dorsal denticle and a small denticle at 

 its base; seta 3 larger than others. 



Case (Figure 497) 17— 18 mm long, straight, cylindrical, with large dorsal 

 anterior-margin process, consisting of flat fragments of detritus with 

 accurately cemented margins; posterior end rounded, with a central 

 opening surrounded by small, regular fragments of detritus (Figure 497, B). 



Pupal case with a sievelike membrane at each end, and covered with 

 loosely attached sand grains and small stones (Figure 497, C). 



(280) 



i^BB 



if 9 7 



FIGURES 495-497. Stenophylax p ermi stu s McL. (after Frochot): 



495 - head, dorsal; 496 - thoracic tergites; 497 - part of larval case, lateral 

 (A), posterior end of larval case (B), pupal case (C). 



351 



