Pupa. Length 9—12 mm. Antennae reaching abdominal segment 8. 

 Dorsal process of abdominal segment 1 pale, posterior saddle-shaped 

 process with shallow median depression and small spinules lateral to 

 it (Figure 384, A). Gills as in larva. Hooks of holding apparatus: 

 111:2-4; IV:2-4; V:2-4+8-12; VI: 3-4; VlI:2-4. Anal rods thin, slightly 

 thicker at end, with small spinules; 1st seta situated at basal margin, 

 2nd seta in distal third, 3rd and 4th setae situated apically and subapically 

 (Figure 384, b). Penis sheath and ventral appendages in Figure 384, C. 



Pupal case covered at both ends by convex covers of sand grains with 

 fine holes between them. 



Mode of life and habitats. Spring species. Forest brooks, brooks 

 and ditches with a slow current and clean water. 



Distribution. The European USSR. In addition, Europe. 



16. Limnophilus vittatus Fabricius 



Pictet, 1834:158, Plate X, Figures 3, a, b, 4a. - Kolenati, 1848:50.- 

 Hagen, 1864:250-251.- Walser, 1864:69.- Meyer, 1867:162.- Meyer -Diir, 

 1875:387.- Ostwald, 1901 :102-105.- Siltala, 1903a:24-27, Figure 7.- 

 Struck, 1903:86-88, Plate I, Figure 9.- Ulmer, 1903:51, Figure 25.- 

 Siltala, 1904c: 49.- Ulmer, 1909:264, Figure 397.- Dohler, 1914:39.- 

 Lestage, 1921 :738, 744, 749.- Lepneva, 1940:215.- Hickin, 1943:72-74, 

 Figures 1—6. 



Full-grown larva. Length 12— 13 mm. Head slightly oblong. Frontoclypeus 

 mainly uniformly chestnut brown; posterior angle and stripe at posterior 

 end of frontal sutures usually yellowish; wedge-shaped pattern indistinct, 

 formed by large dots; surface lateral to frontal sutures, chestnut brown; 

 periocular area large, yellowish; dorsal stripes indistinct, only slightly 

 darker than other surface, with a few large, sometimes indistinct, dots 

 situated either singly or in short transverse rows of 2—3; longitudinal rows 

 of small dots on area of lateral stripes, dots more distinct between stripes, 

 'ventral side of head mainly brown, lighter at anterior margin and along 

 gular suture, with groups of dots on light background near occipital foramen. 

 The described pattern is visible in preparations; head of whole specimens 

 -,. Q usually uniformly chestnut brown, with whitish light periocular area. 



Setae characteristic; seta 14 very long, thick; large setae chestnut 

 brown. Median and intermediate of the 3 anterior -margin setae short, lateral 

 seta light, almost as long as median seta; anterior frontal seta longer, 

 procumbent; middle frontal seta short, brown, posterior frontal seta small, 

 thin; seta 7 short; seta 10 slightly smaller, light; seta 9 long, thick, shorter 

 and thinner than 14; setae 11 and 13 small, thin; seta 12 moderately long; 

 seta 14 slightly longer than width of head, longer and thicker than all others; 

 seta 15 thin, of moderate length, as long as 9; seta 16 short, procumbent; 

 seta 17 strong, thin, moderately long. Ventral seta 8 thin, strong, seta 18 

 snaall. 



Labrum dark golden brown, with shallow median indentation. 



Mandibles slightly oblong; middle tooth of left mandible largest of the 

 5 teeth; both dorsal teeth wide, rounded, ventral teeth slightly smaller; 

 brush situated on both mandibles in middle of dorsal blade; subventral 



274 



