further basally. Outer side of mandibles with 12—14 light setae mainly in 

 the basal part, 2 primary setae among them. 



Submentum (Figure 678, B) lighter than pregula, chestnut brown, darker 

 on the outer side; setae brown; primary seta longer than the others, 

 situated near an indentation of the lateral margin, near the base of the lobe; 



cardo yellowish; setae brown at base 

 and partly on the sides; stipes pale 

 yellow, with a narrow yellowish brown 

 stripe; setae chestnut brown and light 

 brown, forming 2 tufts near base and 

 apex. Palpifer yellowish; primary 

 distal seta relatively thick, brownish, 

 straight, reaching 2nd segment of palp; 

 2nd primary seta situated basally near 

 the median angle, spinelike, small, 

 light; numerous thin, light hairs near 

 the inner margin; galea cylindrical; 

 sensillae and setae relatively large. 

 Submentum reddish brown; ventral 

 sclerites small, rounded, their setae 

 light; relatively large; palpifer small, 

 horseshoe -shaped, light yellow; labial 

 palps very small. 



Pronotum mainly brown in the 

 middle, whitish and without pattern 

 laterally, except at the anterior margin; 

 large spots characteristic for Hydro- 

 ps y c h e, light and in each half of the 

 sclerite; lateral margin with a black border broader near the posterior 

 angles; posterior angle narrow, chestnut brown laterally, light in the middle 

 of each half; anterior margin without dark border. Sclerite with the same 

 sausage- shaped covering setae as on the head; small hairlike setae among 

 them mainly simple, with 2 or several branches in some places; sparse 

 yellowish sausage -shaped covering setae on the whitish lateral part 

 anteriorly; only isolated setuliform and hairlike setae posteriorly. A 

 regular row of sausage- shaped chetae, long laterally at the anterior margin; 

 short, dark, inward -curved setae with blunt ends near the anterior angles; 

 hairlike setae divided from the base into thin, very long, light setae are 

 among the sausage -shaped setae; a short, light, ordinary seta near the 

 anterior angle, among the minute anterior-margin setae; a longer, thicker, 

 brownish seta with a blunt end which is a modified sausage -shaped seta 

 near the anterior margin; a similar, brownish, longer seta with blunt end 

 present instead of the medioanal seta in the posterior third; sclerite with 

 several short, light, ordinary setae resembling the anterior-angle seta; one 

 of them near the median suture, in about the middle of the sclerite; 3 other 

 setae form a transverse row; a shorter seta in the anterior third, in the 

 dark area anterior to the latter setae and closer to the anterior margin; 

 a similar seta in the light area of the sclerite. 



Meso- and metanotum (Figure 682) without pattern, except for the oblique 

 dark stripes near the anterior angles; they are mainly brown and light 

 posteriorly; anterior margin pale; lateral margin with a narrow, black border 



FIGURE 679. Hydropsyche ornatula McL. 

 Secondary covering setae in area of primary 

 setae 9 and 11 



550 



