Pronotum light, yellowish, with narrow, reddish brown anterior margin; 

 posteriorly, margins brownish. Each half of sclerite with characteristic 

 smoke brown pattern on light background, darker and wider anteriorly 

 (Figure 84); rows and groups of brown and dark brown dots on the light 

 and dark areas; posterior area of sclerite light brown, with small dots, 

 anteriorly bordered by a sharp rim, posteriorly and laterally with wide 

 black margin. 



Anterior -angle seta long, dark reddish brown; one such seta and several 

 thinner, short, and long setae near anterior margin; one moderately long 

 and 3 small setae at the lateral margin; a seta as long as the anterior -angle 

 seta, 3 long setae, and 3—4 small setae on the surface. 



Meso- and metanotuin as in S. ph a 1 a en o i d e s, chaetotaxy the same; 

 reddish brown longitudinal stripe of median sclerite of mesonotum indistinct, 

 with small, dark dots, which are distinct in light specimens. 



Pleurites of meso- and metathorax light yellow, with reddish black 

 pleural suture, epimeron with a group of small dots at the base; setae as in 

 S. phalaenoides. 



Legs as in S. p h a la en o i d e s, fore tibiae and tarsi apparently fused 

 (Figure 85). Mid- and hind coxae with distinct, light yellow, dorsal, and 

 reddish brown, ventral areas, with numerous small dots at the base. 



Processes of abdominal segment 1 as in S. phalaenoides, dorsal 

 process smaller than lateral processes and blunt. Segment 8 with 

 presegmental ventral gills, sometimes also with presegmental lateral gills. 



Tergite of segment 9 (Figure 86) with sharp pattern of dots at the 

 base; medioanal and anterior -angle setae thick, black. Sclerite "b" of 

 anal legs with small dots, with blackish brown posterior margin, similar 

 margin at base of sclerite "c". Claw as in S. p h a 1 a en o id e s, with 3 

 large and 3 small dorsal denticles. 



Case smooth, slightly curved, to 43 mm long, made of pieces of plants 

 arranged in 7—8 circles (Figure 87). 



Pupa. Frontal sclerite slightly inflated near base of clypeus, not darker 

 than other parts of head. Labrum with 6 short setae near anterior margin, 

 the 2 outer setae longer than the others. Mandibles without outer tubercle, 

 with short, narrow apex. Presegmental plates of holding apparatus on 

 segments 4—7 large, with numerous spinules, on segments 3 and 8 with small 

 spinules or without spinules; number of spinules 111:0—15; IV: 15 — 19; 

 V:17-24+ 23-28; VI:18; Vll:20-23; Vlll:0-18. Gills present on abdominal 

 segments 2—7. 



Anal appendages short, forming a blunt median process, with rugose, 

 posterior margin. Ventral appendages of male pupae small; penis sheath 

 wide, bifid. 



Pupal case 35— 48 mm long, made as in the larva, both ends covered on the 

 outside with moss and pieces of plants. 



Mode of life and habitats. Forest brooks and other small water 

 bodies. 



Distribution. Northern, northwestern, and central parts of the 

 European USSR, Siberia, the Maritime Territory, Sakhalin. In addition. 

 Northern Europe, Mongolia, Japan. 



63 



