Legs as in L. tineiformis; natatorial setae of hind legs dense, strong, 

 golden brown. 



First abdominal segment with large dorsal process, with an arc of 

 denticles in form of a thin, brownish stripe; lateral processes with whitish 



disks; spinules light; sclerites indistinct, yellowish 

 white (Figure 796). 



Abdominal segment 2 with 2 thick, dorsal gill 

 filaments at anterior margin on each side; filaments 

 normally developed in contrast to L. tineiformis, 

 pointed (Figure 796). 



Abdominal segment 9 with a thin, reddish brown, 

 medioanal seta laterally at posterior margin and 

 with a short, thin, lateral seta. Sclerite "b" of anal 

 legs light; distodorsal setae as in L. tineiformis. 



Case 10 — 11 mm long, made of secretion, straight, 

 brown, elongate, conical, darker and harder than in 

 L. tineiformis, with fine, mineral grains among 

 FIGURE 796. Leptocerus threads of posterior part, which is made earlier. 



valvatus Mart. First and nn-j ri-r ji i,-j.x„ a»„„„^ 



,,^ ., Modeoflifeandhabitats. Among 



second abdominal segments, , ., . 



j^^gj.^j vegetation m slowly running water. 



Distribution. USSR: Maritime Territory and 

 Amur region. 

 The larva is described from specimens collected in a creek of the Daubikhe 

 River at Kvamuka bee-farm near the village of Yakovlevka, 1 July 1927; 2 

 specimens, collected by 1. 1. Sokolov; 19 adults, same day, same locality 

 (Martynov, 1934:254). 



7. Genus Adicella McLachlan 



The larva of only one species is known. 



Mode of life and habitats. Small running water bodies, 

 mainly springs. 



Distribution. Western border areas of the USSR, Caucasus. In 

 addition, Europe, Africa, India, China, Sunda Islands. 



1. Adicella filicornis Pictet 



Morton, 1904:82— 84, Figures 1—11.— Ulmer, 1909:251, 309, Figure 454b.— 

 Lestage, 1921:Figure 219. 



FuIL-growTi larva. Length 6— 7 mm. Body narrow (Figure 797, A). Head 

 slightly oblong, uniformly reddish brown; gula square, its posterior margin 

 narrower than anterior margin. Antennae slightly wider distally, with a 

 short seta. 



Labrum (Figure 797, B) with deep median indentation, setae 1 and 2 

 curved inward, in form of light spines; seta 4 straight, small, thin; setae 

 3, 5, and 6 straight, thin, and of about equal length. Mandibles (Figure 797, C) 

 short, massive, with sharp, projecting, distal tooth; dorsal blade of left 

 mandible prominent, with toothless rugose margin; ventral blade of left 

 mandible with one tooth; right mandible with 2 teeth on each blade. 



622 



