thinner; one of the 2 posteroventral setae situated subapically, long and 

 dark, the second in the middle of the segment and spinelike; one of the 

 anteroventral setae situated near the suture, the other apically; both are 

 spinelike, slightly curved; third seta not marked. Femur short, with broad 

 base and narrow apex; setae as on the forelegs. Tibia broader apically 

 than basally; apicodorsal seta long and dark, subapical seta shorter and light; 

 anterior and posterior setae almost of the same length; both ventral setae 

 small and spinelike, situated distally close together. Tarsus narrower 

 distally; dorsal setae thin, almost of the same length, situated apically and 

 subapically; ventral row of spinules absent except 2 small, strong distal 

 spinules situated between the distoventral setae; the posterior of these 

 setae flattened, broadened like a leaf; anterior seta thin, light and feathered; 

 both setae small. Claw as on the forelegs, with a blunt basal spine and a 

 pointed transparent seta at its base. 



Abdominal segments colored like meso- and metathorax; first segment 

 much smaller than the others; segments 2 and 3 also slightly shorter than the 

 following segments. Medioanal seta relatively long; the thin, light, poorly 

 visible intermediate and lateral seta, which are longer on the posterior 

 segments, situated near it. Anterior-angle seta slightly shorter and 

 thinner than medioanal seta; longer on segments 7 and 8 than on the 

 anterior segments and displaced to the posterior half of the segment. 

 Anterior-margin setae small and light.* One ventral seta in each half of the 

 segment; they are well developed on segments 2—8 and project ventrally; 

 they are short and light, not always marked on segment 1. 



Medioanal seta of segment 9 strong, dark reddish brown, long inter- 

 mediate seta small, thin, larger than on the preceding segments; lateral 

 seta small; sides with a strong dark anterior -angle seta posteriorly; ventral 

 setae as on segment 8. 



Section "a" of anal legs short (Figure 549); sclerite of section "b" with a 

 group of 7 blackish brown setae distally, 2 of them thick and long, situated 

 near the base of the dark plates of the geniculate bend; 4 thick and long setae 

 situated close together near them on the outer side; a short, dark seta, which 

 is slightly curved posteriorly above the former setae; a long straight dark 

 399 seta on the outer side, in about the middle of the ventral margin. A straight, 

 light, moderately long, strong seta on the sclerite of section "c." 



Claw (Figure 550) dark brown, with spinules ventrally; setae 1 and 2 of 

 the same length; the similar seta 3 situated distally in the middle; seta 6 

 situated in the distal part on the outer side; seta 5 situated near the margin 

 of the basal part of the claw; seta 4 situated on a membrane; seta 8 straight 

 and strong, light brown, reaching the end of the claw. 



Mode of life and habitats. Larvae free -living, building galleries 

 of loose tissue on various objects; these galleries are 40— 50 mm long; they 

 are detritophagous and occur mainly in lakes, in the calm littoral with weak 

 surf, often in estuarine zones and in slow rivulets, in plant thickets and near 

 the banks. 



Distribution. European USSR. In addition, Europe. 



2. Tinodes rostocki McLachlan 



Klapalek, 1893:122-125, Figure 33. - Ulmer, 1903:122; 1909:233, 299, 

 Figure 434.— Lestage, 1921:518, Figure 172, c, f, m. 



* Visible in microscopical preparations. 



447 



