503 



FIGURE 704. Hydropsyche nevaeKol 

 Covering setae of head 



without covering setae in its greater part; setae form a dense covering 

 only in the anterior angles; short, light, flat setae which are distally 



serrated or fimbriated at the 

 crenulate anterior margin. Setae 

 sparser on sides of head, absent on 

 ventral side and on light area around 

 occipital foramen. 



Primary setae thin. Lateral 

 anterior-margin seta situated in the 

 angle of the frontoclypeus light, curved; 

 intermediate setae straight, brown, 

 strong, relatively long; median seta 

 small and light; anterior frontal seta 

 light, thin, small, situated among 

 secondary anterior-angle setae; 

 mediofrontal seta situated medial to 

 dark spots of tentorial pit; posterior 

 seta situated on dark background near 

 frontal suture; both last setae slightly 

 thick. Seta 9 situated lateral to 

 frontal sutures and as long and dark 

 as the intermediate frontal seta; thin 

 yellowish seta 11 situated near it; 

 seta 7 straight, brown, slightly shorter 

 than seta 9; seta 10 light, short; 

 seta 14 situated posterior to the eye, strong, moderately long, dark brown; 

 seta 12 light yellow, short; seta 15 long, yellow, thin, directed anteriorly; 

 seta 16 situated near frontal suture, posterior to posterior frontal seta. 

 Ventral seta 8 situated near anterior margin, small, straight and brown; 

 seta 18 very small, light, setuliform. 



Labrum (Figure 705) mainly dark brown; dark median space covered 

 with minute setae, separated by yellow lateral stripes from darker spots 

 near the posterior angles; lateral tufts as in H. angu s t i p e nn i s. Seta 5 

 long, yellowish, well marked. 



Mandibles (Figure 706) as in other species of the genus; each mandible 

 with 2 long apical teeth; upper blade of the left mandible with 1 additional 

 tooth; lower blade with 3 teeth of the same size; median brush of left 

 mandible golden brown; upper blade of right mandible without teeth, lower 

 blade with 3 teeth, median tooth smaller than lateral teeth; basal tooth of 

 both mandibles with broad base and slightly blunt apex; outer setae light; 

 both primary setae close together, slightly curved; secondary setae few in 

 number and of different length. 



Submentum brown (Figure 707), lighter than gula, darker at base of lobes; 

 lobes dark brown, rounded anteriorly, with rugose surface; an oblique row of 

 short setae, some of them thick and dark brown, on sides of basal part; dark, 

 primary setae of submentum situated laterally, near base of lobes, relatively 

 long; a similar, long but lighter secondary seta near it; lobes with short, 

 dark setae, some of which are thick. Cardo and stipes yellowish; setae 

 near base of cardo and of brushes of stipes brown. 



Pronotum light yellow laterally, mainly dark brown in the middle, sub- 

 divided into an anterior and posterior part by a light stripe which is 



575 



