Case straight, in form of an elongate cone made of small plant fragments 

 arranged in a spiral, with narrower apex; length 14 — 16 mm, rarely 20 — 25 mm 

 (Figure 777). 



Pupa. Length 9 — 10 mm. Antennae of male pupae coiled 3.5 times 

 around posterior end of body (Figure 778, B). Anteclypeus with 3 short, 

 strong setae on each side. Labrum with large median process; strong, 

 dense setae behind process. Median blade of mandible coarsely serrated, 

 485 deeply concave (Figure 778, A). Wing sheaths reaching to middle of segment, 

 6 in male pupae. Mid-tarsi with dense natatorial setae on 4 proximal 

 segments; fore tarsi with a sparse row on 3 proximal segments. 



Number and arrangement of gills of T.bicolor (after Siltala) 



Segment 



Dorsal 



Pleural 



Ventral 



2 



1 

 1 



1(0) 



1 



3 



1 

 0-1 





1 



4 



1 





1 



5 



1 





1 



6 



1 





1 



7 



1(0) 





1(0) 



8 



1(0) 





1(0) 



Holding apparatus on segments 3 — 6; number of denticles: 111:2 — 3; IV: 

 2—3; V:2— 4 + 6— 7; VI:2— 3. Gills single, on segments 3— 8, as in the larva. 

 Dorsal processes of segment 9 with 4 setae, including one relatively long 

 seta and 3 short strong setae. Anal rods long, swollen basally, basal part 

 uniformly wide, more than 2.5 times as long as narrow apical part; a sharp 

 boundary between basal and apical part; all 4 setae light, large, 3 of them 

 on median side, the 4th situated subapically on outer side, curved; small 

 thin setae on whole rod, except for basal and apical part, a group of such 

 setae in middle of left rod. 



Mode of life and habitats. Stagnant and slowly running waters, 

 in vegetation, usually in shallow places close to bank, at a depth of 0.2 — 1.5 m; 

 frequent in lower reaches of slow rivers and rivulets with rich vegetation. 



Distribution. Western, northern, and central parts of the European 

 USSR. In addition, Europe, especially Northern and Central parts. 



2. Triaenodes conspersus Rambur=i- 



Struck, 1903:Plate III, Figure 11.— Ulmer, 1903:107, Figures 67, 88, 102, 

 118,127; 1903a:70, Figures 1—8; 1909 :249, 310, Figures 447f, 456. — Lestage, 

 1921:623— 631, Figure 212 f.— Hickin, 1954:153—155, Figures 1—4, 6. 



" Appears in the literature as T ri a e nod e s conspersa. 



607 



