302 Anal legs massive, directed obliquely downward, broadly connected with 

 the body of the segment (Figure 352); dorsolateral sclerite wide, chestnut 

 brown, without dots, with a black basal margin and 4 thick, long, dark brown 

 distal setae. Sclerite "c" large; its distal part covers the ventral side of 

 the anal legs and partly also their outer side and almost their whole median 

 side; sclerite with 2 setae; it bears numerous minute spinules like the 

 adjacent membrane. 



Claw with large dorsal hook and 3 pointed ventral spinules (Figure 353); 

 transverse membranous stripe narrow and curved. Dorsal seta 1 long; 

 curved and brown; seta 2 also long, situated subdorsally; outer surface seta 6 

 long and strong, dark brown; ventral setae 7 and 8 of almost the same size; 

 seta 14 thin and smaller. 



305 The larvae live in cases built of large sand grains or small stones 



(Figure 97); the particles are larger in the upper, convex, rooflike part of 

 the case than in the flat ventral wall; anterior and posterior openings of the 

 case of the same size; the mineral particles of the upper rooflike part of 

 the case (as in pupal cases of Rhyacophilidae) are connected by strands of 

 threads and have free spaces between them. 



FIGURE 357. Mystrophora altaica Mart. Pupa 

 in the cocoon and case, dorsal, ventral and lateral 



Pupa. Length 6.5— 7.0 mm (Figure 354); antennae of male reaching the 

 5th abdominal segment, those of the female the 7th segment; first antennal 

 segment with 3 short setae. Clypeus with 3 setae laterally; labrum with 

 6 setae (Figure 355), 3 of them situated near the anterior margin, a short, 

 median seta and 2 longer setae; 2 are situated near the lateral margin and 

 one on the surface; the setae are projecting and dark. Mandibles with two 

 teeth; one tooth large and serrate like the whole distal part of the blade, 

 the second is basal and small; outer setae of mandible short, straight, 

 situated close together; dorsal seta slightly larger and thicker than the 

 ventral seta. 



331 



