end of the suture, brown, thin, moderately long; seta 3 slightly darker and 

 thinner, situated on median side of distal part; seta 6 situated laterally in 

 distal part, smaller; all ventral setae, light; setae 7 and 8 similar, situated 

 submarginally on sclerite and nearby on membrane; seta 5 situated laterally, 

 very small; seta 4 slightly larger, situated medially near margin. 



Case 6— 7 mm long, slightly curved, strongly convex dorsally, narrower 

 posteriorly, made of medium-sized sand grains, arranged not very smoothly; 

 ventral surface almost flat; larger grains situated subventrally on the 

 sides, forming a narrower, flat, ventral surface. 



Mode of life and habitats. Cool, rapid mountain brooks; upper 

 reaches of large mountain rivers; rapids, near waterfalls, springs and 

 spring-fed brooks. 



Distribution. USSR: mountainous parts of Middle Asia. 



8. Apatania mullebris McLachlan 



Klapalek, 1889:241-242; 1893:35-37, Figure 10.- Struck, 1903:101.- 

 Ulmer, 1903:75.- Lestage, 1921:682-687.- Nielsen, 1942:567-587, Figures 

 147-159. 



Full-grown larva. Length 5.0—8.2 mm; habitus as in Figure 228. Head 

 (Figure 22 9) light brown; eyes on light spot; frontoclypeus slightly dark 

 near anterior margin, area of tentorial pits with large dark dots, surface 

 lighter between dots. Ventral side of head (Figure 229, B) slightly darker 

 laterally. Gula slightly oblong, with rounded sides (Figure 232). 



Seta 14 longer than the others, as long as width of head; seta 15 slightly 

 shorter, thick, lighter. Secondary setae, small, light, relatively thick, 

 setuliform (according to Nielsen, 29—34 setae on the frontoclypeus, 

 29—35 on large lateral sclerites). 



Labrum brown, with dark dot; a blackish groove at posterior margin; 

 posterior-angle sclerites brown; setae as in Figure 230. 



Mandibles spatulate (Figure 231, A, B), without teeth but distal teeth are 

 present in the 1st stage (Figure 231, C, D); dorsolateral seta short, brown, 

 ventral seta small, light. 



Submentum (Figure 232) oval; seta long, situated near distal margin; 

 stipes light brown, with brown posterior stripe. Palpifer light brown, 

 with anterior process bearing a thick, distal seta near its base; median 

 basal seta small, light. Maxillary palp short, wider basally; 1st segment 

 almost as long as 2 following segments together, with short, open lateral 

 sclerite; 2nd and 3rd segments of the same length; 4th segment smaller. 

 Submentum dark brown, in form of short semicircle; ventral rods narrow, 

 long, with small, light seta. Palpiger large, semicircular. 



Pronotum (Figure 234) yellowish anteriorly, also lighter laterally; 

 posterior margin brownish, with black, median submarginal stripe; a large, 

 black spot near base of posterior-angle process; surface with several 

 lighter dots. Primary setae short (anterior -angle seta about /s of 

 width of head); secondary setae appearing in 2nd stage, also short; light, 

 anterior -margin setae situated some distance from margin (dark anterior- 

 margin setae absent), other secondary setae distributed on whole tergite, 

 small, light or dark, thin, curved anteriorly or slightly thick. 



171 



