Gills on abdominal segment 7 absent; number and distribution of gills 

 listed in Table 21 (after Siltala; pleural gills of abdomen not listed). 



Pupa. Length 9—12 mm. Antennae of male pupae longer than body; 

 antennae of female pupae reaching abdominal segment 7. Three long, 

 501 primary setae and 1 long, secondary seta lateral to anteclypeus on tubercles 

 among short, dark setae; 4 long, primary setae among setae of the labrum. 



Lower blade of left mandible with 4 teeth; lower blade of right mandible 

 with 3 teeth; serration of teeth and blades weak. Natatorial setae on 

 segment 4 of mid-tarsi more numerous in male pupae than in H. angusti - 

 p e nn i s. 



Number of spinules of presegmental plates as follows: 111:7—12; IV:4— 7; 

 V:4— 7; VI:4— 6; VII:3— 7; postsegmental plate of segment 3 with more 

 numerous spinules; plate of segment 4 with few spinules; only 4—7 spinules 

 in male pupae, 1 1 in females. 



Ventral gills on abdominal segment 7 absent; this is a diagnostic 

 character of this species. Number and distribution of ventral gills and 

 filaments on other segments shown in Table 22. 



TABLE 22 







Segment 



Lateral 



Median 



2 



36 



, 28-29 



3 



31-35 



27-28 



4 



36 



28 



5 



26-28 



19-25 



6 



17-18 



15-16 



Sheath of male genitalia curved, contiguous posteriorly; penis sheath 

 slightly displaced from the inner side of the genitalia, divided at the end. 



Pupal case 14—21 mm long, made of stones and sand grains; the stones 

 may be 9 mm long and 8 mm broad. 



Mode of life and habitats. Brooks and rivulets with a stony 

 bottom; occurring in large numbers in some places. 



Distribution. North and west of the European USSR and the Caucasus. 

 In addition, Europe, Iran, North Africa. 



7. Hydropsyche nevae Kolenati 



Siltala, 1905:114, Figure 27.- Lepneva, 1928:26-27; 1948b:72-76, 

 Figures 1—5. 



Full-grown larva. Length 16—17 mm. Head yellow or brownish yellow; 

 pattern distinct (Figure 703); dorsal surface flattened. Frontoclypeus 

 large, broad, with light spots; number of spots sometimes only 4, but they are 

 different from spots of the preceding species; anteromedian spot longitudinal, 

 oblong, narrower in the middle; largest posterior spot transverse, reaching 

 the frontal sutures; anteromedian spot sometimes divided into 2; posterior 

 spot sometimes divided into 3 spots (one median and 2 lateral spots), so that 



573 



