12 (5). Pattern of dorsal surface of head complicated; frontoclypeus 



sometimes with 7—9 light spots ...;... 7. H. nevae Kol. (p. 573) 



1. Hydropsyche ornatula McLachlan 



Dohler, 1911:385-390, Figures 1-8.- Lepneva, 1929:600-602, Figure 1; 

 1940:206-207, Figure 154,2— 3; 1960b:19-24, Figures 1-12. 



Full-grown larva. Length 12— 15 mm. Head broad (Figure 678, A); 

 length to width 1:9.0. Frontoclypeus with shallow lateral indentations; 

 its anterior margin slightly projecting, crenulate. Clypangulus small, 

 blackish brown. Gula fused with pregula, wedged in a small triangle into 

 the head capsule; anterior margin of pregula projecting; its angles slightly 

 raised. Postgula forming a small, black sclerite. Frontoclypeus mainly 

 light; grayish brown stripes along the frontal sutures, which form a dark 

 lyre- shaped figure together with the dorsal stripes; sides of head light, 

 without dots. A broad dark stripe ventrally in the middle of each half; 

 head dark ventrally, with indistinct light dots near the occipital foramen 

 (Figure 678, B). Dark dots absent. 



A characteristic covering of cylindrical, sausage-shaped setae, which 

 are more or less long dorsally, mainly in the dark areas, or near them 

 (Figure 679); smaller, hairlike setae which are either simple, divided or 

 have 2 or 3—5 branches among them; Dorsal stripes completely covered 

 with these two types of setae; dark stripes of frontoclypeus near seta 9 and 

 near the bifurcation of the frontal sutures also with the two aforementioned 

 types of chetae; stripes only with small covering hairlike setae in some 

 places; these are rarely present also on the white "mirror" of the sclerite. 

 A group of long sausage -shaped setae near base of mandibles; light sides of 

 head also with covering setae of the two types behind the eyes; these setae 

 are sparser. Ventral surface without covering setae. 



Anterior-margin, primary setae situated near the angles of the fronto- 

 clypeus; median seta transparent, straight and strong; intermediate seta 

 relatively long, light yellow; lateral seta shorter and paler; frontal setae 

 light, thin and short; anterior frontal seta situated in a group of similar 

 secondary light setae on the anterior angle; median frontal seta situated near 

 the tentorial pit; posterior frontal seta situated near the frontal suture, 

 posterior to the pit. Seta 9 longer and darker than the others, reddish 

 brown; the short, thin seta 11 situated posterior to it; seta 7 light, as long 

 as intermediate anterior-margin seta; ventral seta 8 slightly yellowish, 

 slightly shorter; seta 10 situated posterior to seta 7, thin and small; seta 12 

 situated on the outer side behind the eye; seta 14 situated more medially, 

 also thin; seta 16 thin and short; seta 17 smaller, situated posterior to 

 seta 16, near the suture; ventral seta 18 small, light yellow, spinelike. 

 Dorsal stripes anterior to the eyes with a group of thin, light, secondary 

 481 setae which are smaller and sparser on the clypangulus; several light, 

 short, secondary setae on sides of the head. 



Labrum (Figure 680) rounded anteriorly, without median indentation; 

 posterior-angle sclerites thin, curved inward, with a large brownish yellow 

 spot at the base; sclerite brownish yellow in the middle, whitish laterally 



548 



