brown dots. Dorsal stripes pale, differing from those of O e . furva in 

 having 2 small, indistinct, dots only in anterior part and a larger stripe: 

 2 large, dark dots further posteriorly along suture. Oblong dots, 2 or 3 in 

 a row lateral to coronal suture; large dots on site of lateral stripes and 

 laterally on ventral side. Gula large, golden brown, with dark brown 

 anterior margin. Setae thin, brownish (Figure 824). 



Labrum golden brown: median depression shallow, with 4 small tubercles. 

 518 Mandibles reddish brown, darker basally, slightly concave laterally between 

 the basal and apical part; basal of the 2 teeth on median blade much larger 

 than the small subapical tooth: lateral setae light. Sclerites of cardo 

 large, black: area of submentum membranous, white, setae light brown, 

 moderately long. Stipes wide, yellowish, with a large, blackish brown, basal 

 spot and a reddish, median stripe; basal seta slightly shorter than apical 

 seta. Mentum brownish. 



Pronotum yellowish at margin, with a wide, brownish, transverse area in 

 the middle: dots reddish brown, not very distinct; posterior margin light, 

 with a wide, black lateral stripe and a dark, transverse stripe. Anterior margin 

 and anterior angles with more numerous secondary setae than in O e . furva; 

 medioanal surface seta strong, moderately long, dark brown; lateral seta 

 also long but lighter and thinner: intermediate seta thin, large. 



Mesonotum grayish, pale, with 2 indistinct dots at anterior margin; 2 

 paler dots at anterior angle and at lateral margin; 3 indistinct dots on 

 surface. One long seta situated between dots at anterior margin, another 

 similar seta lateral to these dots; 3 smaller setae at anterior angle: 

 medioanal seta and lateral seta very long; intermediate seta also long. 



Metanotum with 5 setae in anterior angles, among them one primary 

 and one secondary seta longer than the others; medioanal surface seta 

 moderately long. 



Propleuron, as in O e . furva, with wide lobe-shaped trochantin: seta 

 subapical, dark: setule situated at base of a small, light, distal process. 



Legs as in O e . furva; claws of mid- and hind legs' as in Oe. furva, 

 thin, long; basal seta in form of small, light spine. Mid tibia with 11—12 

 large, light setae at ventral margin; tarsus with 6 — 7 ventral spines. Hind 

 trochanter, femur, and tibia with dorsal and subdorsal rows of long setae 

 almost as dense as in natatorial rows ofLeptocerus tineiformis; 

 tarsus with a ventral row of 7 — 8 light spines. 



Gills on segments 2 — 7. 



Tergite of segment 9 thin, pale; medioanal seta and lateral seta thick, 

 long, dark reddish brown; anterior-angle seta also long but slightly thinner 

 and lighter: intermediate seta and anterior-margin seta moderately long, thin. 



Anal legs short. Sclerite "b" mainly light; 3 thick, dark reddish brown 

 setae situated close together and a short, light seta dorsally; a dark, thin, 

 moderately long seta laterally and distally. Claw pinkish, with 2 dorsal denticles. 



Case made of small plant fragments, tapering posteriorly, with convex 

 dorsal and flat ventral sides, resembling the case of Athripsodes 

 annulicornis orA.excisus; plant fragments on dorsal wall projecting 

 laterally, forming a ridge which separates ventral wall; posterior end 

 with broad, oval, transverse hole (Figure 825). 



Pupa. Case as in larva: attachment at both ends by a large disk with a 

 short, thick stalk: posterior opening with a membrane with a round hole 

 which is much smaller than in larva (Figure 826). 



Mode of life and habitats. Snags, canals with a slow current. 



Distribution. USSR: Amur region. 



647 



