[294) 



Legs brown, with dark brown punctation on coxae, femora, and tibiae; 

 trochanters ventrally with light, curved, hairlike spines, as in previously 

 described genera. 



Dorsal process of abdominal segment 1 distinct, lateral processes larger. 

 Lateral line from end of segment 3 to end of segment 8 formed by short, 



dark brown, hairlike spinules. Gills 

 of anterior segments thick, long. 



Tergite of abdomiinal segment 9 

 yellowish brown, with black setae. 

 Sclerite "b" with longer, black setae. 

 Claw with a dorsal denticle. 



Case (Figure 516) 20— 25 mm long, 

 made of sand grains and small stones, 

 narrower posteriorly, slightly curved, 

 with rough surface; fragments of plant 

 detritus often among mineral particles; 

 anterior opening oblique, wide, 

 posterior opening closed by a mem- 

 brane with large, round, central hole. 



F*upa. Length 16— 18 mm. Antennae 

 filiform, reaching end of abdominal 

 segment 7. Labrum with rounded 

 process at anterior margin 

 (Figure 517, A), with a small, golden 

 yellow seta laterally; 5 other setae 

 long, hooked, dark. Mandibles 

 relatively short, with straight distal 

 part with a sharp point and serrated 

 median side; lateral setae short, 

 firm, about the same length 

 (Figure 517, B). 



Wing sheaths reaching middle of 

 abdominal segment 4. 

 Dorsal process of abdominal segment 1 large; lobes of saddle-shaped 

 indentation with small spinules. Holding apparatus on segments 3—7, 

 number of hooks: 111:4-5; IV:7-10; V:7-10 + 10-20; VI:6-9; VII:8-10. 

 Lateral line from end of segment 5 to segment 8; setae long, dense, 

 blackish brown. Gills, as in larva, on segments 2 — 7. Anal rods straight, 

 slightly curved at end, with 4 small, dark setae situated at base, in middle, 

 apically, and subapically (Figure 518). Lateral appendages of male genitalia 

 blunt, wide, longer than penis sheath. 



Pupal case 20— 30 mm long, made of small stones and sand grains; 

 anterior and posterior openings closed with small stones and membranous 

 areas with large holes between them. Case attached almost vertically to 

 a stone. 



and habitats. Brooks with stony bottom and rapid 



5/7 A 



518 



FIGURES 515-518. Micropterna nyctero- 

 bia McL. (after Klapalek): 



515 — left mandible, dorsal (A) inner side (B); 



516 — larval case. Pupa: 517 — anteclypeus and 

 labrum (A), left mandible, ventral (B); 518 — anal 

 "rods. 



Mode of life 

 current. 



Distribution 

 USSR; Middle Asia. 



Western and southern (rarely) parts of the European 

 In addition. Central and Southern Europe. 



369 



