Tergite of segment 9 brown; medioanal, and anterior -angle seta thick, 

 long, latter smaller than former; intermediate and lateral seta short, thin, 

 sometimes accompanied by a secondary seta; a large, moderately long seta 

 situated submarginally between medioanal setae. 



Claw with a dorsal denticle. 



Case 20—34 mm long, made of overlapping plant fragments imbricated 

 so that one particle covers part of the posterior particle; posterior end 

 narrower and covered by a membrane with a large round hole 

 (Figure 392, A). 



Pupa. Length 15— 17 mm. Antennae to segment 8 of abdomen. 



Labrum with a small, light, anterior -margin seta and 5 large setae 

 with slightly curved end. Mandibles brownish, brownish black at end, lateral 

 setae of about the same length. 



Natatorial setae on mid-tarsi not very dense, sparse on hind tarsi. 

 Dorsal process of abdominal segment 1 as in L. ex t r i c a t u s. Holding 

 apparatus on abdominal segments 3— 7, hooks: 111:2; IV:3— 4; V:3— 6+12— 20; 

 VI: 3—6; VII: 3— 5. Lateral line from beginning of segment 5—8. 



Anal rods slightly curved, slightly wider at end; 4 usual setae black 

 (Figure 392, b). 



Case as in larva, its ends covered by stalks of moss and other plants 

 (Figure 392, C). 



Mode of life and habitats. Small, swampy water 

 bodies. Sphagnum swamps, occurring together with larvae of 

 L. s p a r s u s. 



Distribution. Northern, northwestern, and western parts of the 

 European USSR; Western Siberia, Altai, Sayans. In addition. Northern 

 Europe. 



18. Limnophilis xanthodes McLachlan 



Struck, 1903:84-85, Plate II, Figure 4; Plate IV, Figure 9.- Ulmer, 

 1903:55.- Ulmer, 1909:262, Figure 39 3.- Lestage, 1921:736, 749. 



„.. Full-grown larva. Length 18mm. Frontoclypeus entirely chestnut 



brown. Dorsal stripes and punctation indistinct; distinct large dots on 

 area of lateral stripes and in space between them (Figure 393). Ventral 

 surface of head brownish, lighter posteriorly, with groups of dots. 



Pronotum brown, groove in anterior third darker in middle; punctation 

 distinct. Mesonotum mainly brownish, lighter at posterior angles; 

 posterior margin narrow, black, interrupted in middle, wider in posterior 

 angle area. 



Case straight, narrower posteriorly, made of plant particles, which 

 are sometimes large, each particle overlapping the next one; anterior margin 

 obliquely truncate, posterior end slightly narrower, closed by a membrane 

 with a large, round, central hole (Figure 394). 



280 



