228 



Wing sheaths reaching end of segment 4 or beginning of segment 5. 

 Mid -tarsi with poorly developed natatorial setae; hind tarsi with sparse 

 setae on first 4 segments. Gills on segments 2 — 8. 



Holding apparatus on segments 3—7; number of hooks: 111:2—3; 

 IV: 2-4; V: 3-4+ 8-1 5; VI: 3-4; Vll:3-5. Anal rods straight, thin 

 (Figure 402), slightly curved at end; 1st seta situated in basal quarter, 

 2nd in apical quarter, 3rd and 4th setae subapically and apically. Sheaths 

 of ventral appendages narrow; penis sheath large, long, bifid (Figure 403). 



Pupal case 12— 13 mm long, nearly cylindrical, with anterior and posterior 

 membranes; anterior end of case attached to moss or other plants. 



Mode of life and habitats. Among vegetation, in small, 

 swampy water bodies. 



Distribution. European USSR, mainly northern and central regions. 

 Western and Eastern Siberia, Far East, Kamchatka, Sakhalin. In addition, 

 Europe, Japan, North America. 



22. Limnophilus ignavus McLachlan 



Ulmer, 1904:55, Figures 1-2; 1909:265.- Lestage, 1921:740, 747. 



Full-grown larva. Length 15 — 16 mm. Dorsal side of head uniformly 

 dark brown, including frontoclypeus; posterior angle of latter usually with 

 a light yellowish spot; indistinct dots on site of dorsal stripes, more or 

 less distinct dots on site of lateral stripes. Ventral side of head brown, 

 lighter near occipital foramen, with groups of large, indistinct dots. 



Pronotum dark brown; groove in anterior third blackish brown in 

 middle; posterior submarginal zone also slightly darker; X -shaped, punctate 

 pattern indistinct. Mesonotum as dark as pronotum, with indistinct 

 punctation; posterior -angle with blackish oblique stripe; posterior margin 

 narrow, black. 



Legs brown. Primary ventral setae of fore femur represented by 

 2 light, long, spines of different length; posterior seta short, situated slightly 

 further basally. Primary ventral setae of mid -femur strong, moderately 

 long, situated in basal part close together, distal spine in about the middle. 

 Ventral setae of hind legs also dark and strong, slightly longer, situated 

 close together in middle of femur. 



Tergite of abdominal segment 9 yellowish brown, with several secondary 

 setae in addition to primary setae. Claw with a dorsal denticle. 



Case 16.0—16.5 mm long, straight, smooth, made of dark, longitudinally 

 arranged fragments of leaves; posterior end covered by a membrane with 

 large, central, round hole. 



Pupa. Antennae reaching end of body. Mandibles serrated in middle. 

 Midlegs with dense, natatorial setae; hind tarsi with sparse setae. Hooks 

 of holding apparatus : 111:2; IV: 3; V:3 + 8; VI: 3; VII: 3. Sheaths of ventral 

 appendages rounded, no longer than penis sheath. 



Pupal case as in larva. 



Mode of life and habitats. Small, overgrown water bodies. 



Distribution. Northwestern and western parts of the European USSR. 

 In addition. Central and Northern Europe. 



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