VII:6— 12; segment 5 of male pupae with a continuous, transvei-se row of 

 hooks dii'ected anterioi-ly at posterior margin (Figure 633, A); female 

 pupae with a similar row but with a gap in its middle. 



Gills on segments 2 — 6. 



Lateral line distinct, on segments 5—8; setae thin, bi'own. 



Anal rods shoi't, cui-ved; genital appendages of male pupae wide, rounded 

 posteriprly; penis sheath in form of small tubei'cle (Figure 633, B). 



Pupal case 9—12 mm long, tetrahedx'al, covei-ed with small, transversely 

 arranged pieces of detritus. Anterior end closed by a pale, brownish 

 membrane with 6—11 small holes in middle (Figure 633, C); postei-ioi- 

 membrane with 5—6 small holes; case attached at both ends to a stone oi- 

 another object; both ends, especially anterior end, protected by fragments 

 of conifer needles or other plants. 



Mode of life and habitats. Mountain brooks and rivulets, often 

 in large numbers. 



Distribution. USSR: the western pai-t of the Ukraine. In addition, 

 Europe. 



3. Brachycentrus caucasicus Martynov 

 Martynov, 192 6:3 8-40. 



Full-grown larva. Length 11.0—11.5 mm. Head (Figure 634, A) slightly 

 oblong, mainly I'eddish chestnut brown on dorsal side, lighter near tentorial 

 pits, at angle and laterally; posterior part of frontoclypeus with 3 small, 

 light spots; 3 largei- spots on site of dorsal stripes, and several smaller 

 spots in posterior part lateral to coronal suture; dorsal side, as in other 

 species of B r a c hy c e nt r u s, with a large, flat, median area; small, flat, 

 tubercles behind eye and in posterior pai't of frontoclypeus. Ventral side 

 of head, including gula, dark reddish brown, less dai-k posteriorly, with large, 

 light dots. Gula i-eddish bi-own, trapezoidal, slightly oblong, wider 

 anteriorly, with rounded posterior angles (Figure 634, B). 



Number and arrangement of gills of pupa of B. montanus 

 (after Klapalek) 



Segment 



Dorsal 



Pleural 



Ventral 



2 



7 



1 



1 



3 



6-7 



1 



1 



4 



6 



1 



1 



5 





1 



1(0) 



6 





1 (0) 





379 Median and intermediate anterior-margin setae reddish brown, strong, 

 moderately long, the former slightly longer; later'al anterior-margin seta 



474 



