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Pupa. Length 15 — 17 mm. Antennae reaching end of segment 8; scape 

 thicker and longer than other segments. Wing sheaths reaching abdominal 

 segments 4 or 5. Midlegs natatorial; sparse setae on tarsal segments 1—4. 



Holding apparatus on "segments 3—7; number of hooks: 111:2—4; IV:2— 5; 

 V:2-4+8-ll; VI:3-4; VlI:2-4, Gills on segments 2-8. 



Anal rods long, thin; 1st seta situated in basal quarter, 2nd seta 

 about in middle, 3rd and 4th setae subapically and apically. 



Case 17— 19 mm long (Figure 365, B), straight, slightly tapering 

 posteriorly, made of sand grains, as in larva; anterior end with sievelike 

 membrane covered with sand grains; posterior end covered with sand 

 grains and with small holes. Case attached at anterior end. 



Mode of life and habitats. Slow, small, water bodies. Full- 

 grown larvae appear in spring. 



Distribution. Northern, western, and central parts of the European 

 USSR, Siberia. In addition. Central and Northern Europe. 



13. Limnophilus extricatus McLachlan 



Kolenati, 1858:57-58.- Hagen, 1864:251.- Walser, 1864:48.- Meyer, 

 1867:163-164.- Klapalek, 1893:9-12, Figure 2.- Struck, 1900:13, 

 Figure 15.- Siltala, 1902:71-74, Figure 16; 1904c: 56.- Ulmer, 1903:55.- 

 Siltala, 1907:499, 507-510. - Ulmer, 1909:263, Figure 395. - Lestage, 1921 : 

 729, 737, 747.- Hickin, 1948:12-13, Figures 1-8. 



Full-grown larva. Length 11 — 14 mm (Figure 366). Head uniformly 

 chestnut brown; posterior angle of frontoclypeus and a small adjacent area 

 lateral to epicranial suture yellowish; large dots in posterior part of 

 frontoclypeus and on site of dorsal and lateral stripes (Figure 367, A). 

 Ventral side of head mainly brownish, lighter posteriorly, with groups of 

 large dots near occipital foramen. Quia (Figure 367, B) yellowish. Setae 

 dark reddish brown, except light setae; seta 14 markedly larger than 

 others. 



Dorsal sclerite of labrum golden brown, darker than head. Mandibles 

 black, reddish at distal margin. Median distal tooth of left mandible 

 projecting, 2 small, distal teeth ventrally, 2 larger teeth dorsal to it; 

 right mandible with 5 teeth distally, subventral tooth projecting and larger 

 than others; brush of dorsal blade narrow, tuft-shaped, with large chaetoids; 

 lateral setae situated basally; dorsal seta short, dark; ventral light, 

 smaller. 



Pronotum (Figure 368, A) yellowish brown, including anterior third, 

 groove chestnut brown; anterior margin brownish laterally, lateral margin 

 light; posterior margin wide, narrower in middle, with 2 transverse, narrow, 

 black stripes, median stripe some distance from posterior margin; large 

 posterior-angle area reddish brown, with narrow, dark lateral margin, 

 with 2 large dots posteriorly. Setae short, dark brown, strong. 



Mesonotum yellowish brown, slightly darker anteriorly in middle; 

 anterior margin light; posterior margin narrow, reddish brown, brownish 

 in middle; margin of posterior angles slightly wider. Punctation and setae 

 as in Figure 368, B. 



263 



