Mode of life and habitats. Predacious, building capturing nets; 

 living in brooks and rivulets with cool water, on stony bottom with a 

 moderately strong current. 



Distribution. Western, northern and central regions of the European 

 USSR, and Caucasus. In addition, Europe, Iran, Asia Minor, North Africa. 



5. Hydropsy che saxonica McLachlan 



Klapalek, 1888:51-54, Figure 18.- Ulmer, 1903:115; 1909:236, 302.- 

 Siltala, 1905:100-102, Figure 22. - Lestage, 1921:536-544.- Lepneva, 1928: 

 25-26. 



500 



FIGURE 702. Hydropsyche saxonica 

 McL. Median spot of posterior margin of 

 mesonotum (A) and metanotum (B, C) 



Full-grown larva. Length 18— 20 mm. Head yellow or yellowish brown; 

 pattern brown or dark brown. Frontoclypeus with 4 light spots, lateral 



spots larger than anterior and posterior 

 spot; anterior spot usually slightly dark; 

 a row of small, light dots on posterior 

 spot. Lyre-shaped figure on dorsal 

 surface dark brown, its dots relatively 

 light. Dark ventral spots very wide, 

 almost reaching anterior margin; they 

 converge posteriorly and bear light dots. 

 Labrum laterally with relatively short 

 tufts of hair. Lower blade of left mandible 

 with apical tooth and 3 other teeth; middle 

 tooth smaller than others; basal tooth of 

 the same form as in H. angustipennis 

 but smaller. 



Nota of thorax brown or grayish brown, 

 lighter in the anterior angle. Black 

 median spot at posterior margin of meso- 

 notum straight in the middle anteriorly, 

 merging with oblique spots of small 

 curves at an obtuse angle; indentation with spots; small, dark dots lateral 

 to the indentation; spot at posterior margin of metanotum large, serrated 

 posteriorly (Figure 702). 



Legs yellowish brown; light basal seta of claw of forelegs longer than 

 in H. pellucidula. 



Ventral gills of abdominal segment 7 always present. 

 Anal legs and claws as in H. p e 1 1 u c i d u 1 a. 



Pupa. Length of male pupae 11 — 13 mm, of female pupae 12—14 mm. 

 Antennae of female pupae reaching end of abdominal segments 7—8, those 

 of male pupae longer than body. Labrum with numerous dark setae 

 anteriorly. Blades and teeth of mandibles with distinct serration. 

 Wing sheaths reaching abdominal segment 4, their ends rounded. 

 Number of spinules of presegmental plates on abdomen as follows: 

 111:9-14; IV:4-7; V:4-8(ll); VI:6-9; VII:5-8; VIII:3-7; segment 3 with 

 an elliptical postsegmental plate with numerous small spinules; plate of 

 segment 4 usually with 11 — 16, sometimes 9—2 spinules; abdominal 

 segment 7 with ventral gills. Anal appendages of pupa relatively long, 

 almost contiguous posteriorly. Genital appendages of male pupae with 

 slightly undulate inner margin. 



571 



