Mode of life and habitats. Solid bottom in brooks and rivulets; 

 open littoral of lakes and rivers; phytophagous. 



Distribution. Northern and northwestern parts of the European 

 USSR, Eastern Siberia, the Amur region. In addition. Northern Europe. 



5. Athripsodes annulicornis Stephens 



Klapalek, 1893:88—91, Figure 24. —Struck, 1903; Plate III, Figures.- 

 Ulmer, 1903:102. — Siltala, 1905:57—58, Figure 13.— Ulmer, 1909:247, 307, 

 Figures 373c— 449. — Lestage, 1921:606—615, Figures 203b, e, j, r; 207.— 

 Lepneva, 1940:210. 



Full-grown larva. Length 8— 9 mm. Head broadly oval (Figure 727, A); 

 color brownish, with yellowish areas ventrally around eyes and posteriorly; 

 pattern pale, indistinct; light adfrontal, and white lateral stripes less 

 distinct than in A. excisus; gula (Figure 727, B) wide, cup-shaped, 

 brown. Frontoclypeus without pattern. Dorsal stripes, if present, slightly 

 darker than ground color, brown; 3 large dots near frontal sutures; several 

 small dots posteriorly. Setae reddish brown, thin; arrangement and size 

 as in A. excisus (Figure 718, A). 



452 Labrum less wide than in A. excisus; setae 1 and 2 represented by 

 light, transparent, curved spines; seta 4 in form of a small, straight 

 spinule; seta 3 thin, dark, situated in anterior angle; seta 5 larger than 

 seta 6. 



Mandibles reddish brown, moderately long; apical tooth longer and 

 wider than others; dorsal blade of both mandibles with 2 large subapical 

 teeth; ventral blade with a small tooth; median brush absent; lateral 

 setae situated basally, brown, moderately long; dorsal seta slightly larger. 



Pronotum (Figure 728, A) without pattern, with narrow brown or 

 blackish anterior margin. Mesonotum (Figure 728, B) pale, thin, distinct 

 only near median suture, with indistinct margins; posterior-angle sclerites 

 large, bracketlike, blackish or dark reddish brown; anterior-margin seta 

 dark, long; medioanal seta similar; intermediate seta short, thin or very 

 moderately long; lateral seta small, situated laterally near anterior margin 

 of bracketlike streak; 10—11 anterior- angle setae dark, situated on 

 membrane. 



Metathorax widest segment of the body, with large lateral processes; 

 anterior-margin seta short, strong; medioanal seta moderately long, 

 accompanied by small, light, intermediate seta; 5 — 6 anterior-angle setae 

 situated near process. 



453 Propleurites yellow; pleural suture short, narrow, reddish brown; 

 lateral margin of episternum and base of trochantin blackish brown; 

 epimeron represented by a small, narrow plate; seta long, thick, dark, 

 situated near pleural suture; lobe of trochantin narrow, pointed, whitish, 

 anterior seta situated near middle, long, reddish brown; setules light, 

 situated at lateral margin. Meso- and metapleurites thin, indistinct, 

 whitish yellow; pleural suture yellowish or reddish brown basally, black 

 near articulation with coxa; distal margin of episternum short, reddish 

 brown; lighter, pinkish on mesothorax; seta at naargin long, dark; seta 

 of epimeron situated outside sclerite. 



566 



