Mandibles are relatively long (Figure 276); upper blade of the left 

 mandible with a large, projecting, distal tooth; lower blade with a finely 



259 serrated part with small toothlike processes at the sides; upper blade of 

 right mandible with two distal teeth; lower blade with a large, blunt, basal 

 tooth; the distodorsal outer seta is curved, recumbent, shorter than the 

 straight, basoventral seta. 



Submentum forming a broad rectangle (Figure 2 77) with rounded 

 posterior angles and sharp anterior angles; posterior margin of submentum 

 slightly shorter than anterior margin of pregula; setae small, light, situated 

 near the lateral margin in the middle of the sclerite. Sclerites of the 

 cardo also dark brown; the seta is thin, longer than that on the submentum. 

 The sclerites of the stipes have a yellowish brown outer stripe; they are 

 grayish yellow in the middle in the broad part; basal seta yellowish brown, 

 long, distal seta shorter and thinner. Distal seta of maxillary palpiger 

 situated on a membrane, strong and brown; basal seta small and little 

 marked. Galea and palps relatively narrower and longer than in species 

 of Rhyacophila s. str. The second palp segment is more than twice 

 as long as the first. Mentum dark brown; its anterior margin has a small 

 medial notch; the ventral sclerites form small dots; their setae are thin 

 and light; the sclerites of the sickle -shaped labial palpiger and of the labial 

 palp are brown. 



Pronotum (Figure 278) brownish yellow; posterior margin brown in the 

 middle of each half, with a broad, rounded, yellowish process posteriorly; 

 this border is black in the middle and laterally; posterior angles black; 

 lateral margin with a narrow brown stripe in the anterior third and a small 

 brown small spot at the anterior angle; it has a broad black border in the 

 posterior third; it has a brownish red narrow border in the middle. The 

 sclerite bears a row of dots near the median suture; groups of large dots 

 in the posterior part of each half of the sclerite; indistinct dots in curved 

 rows in the middle; The notch at the anterior angle is deep, milk white, 

 with 3 setae which are characteristic for Hy po r hy a c o ph i la: a long, 

 primary seta and lateral to it, on a small sclerite, 2 secondary setae; the 

 posterior of them is almost as long as the primary seta; the second seta 

 is shorter. Lateral to the notch, at the anterior -angle process is a small, 

 strong, light seta and 2 or 3 small, thin setae. There are dense, small, 

 yellowish, thin setae at the anterior margin and posterior to them are 

 3 large setae situated at a distance from each other; these 3 setae are as 



2 60 long as the short secondary anterior -angle seta; pronotum with a long 



brown seta in the middle, near the median row of dots; this seta is as long 

 as the primary anterior -angle seta; a second smaller seta is situated near 

 the curved row of dots; posteriorly, slightly lateral to the above setae is 

 a short light seta; near the lateral margin, at the distal end of the black 

 border, is a large, strong, dark brown seta; a second slightly longer seta 

 is situated anteriorly, at a distance from the border; anterior -angle region 

 with several thin, short, sparse, light setae. 



261 Meso- and metathorax large (Figure l), longer than the following 



abdominal segments; anterior -margin setae of mesonotum long, brownish; 

 setae of metanotum small and light; anterior- angle setae of both segments 

 long, shining brown; small light secondary setae near them; medioanal 

 setae of the segments brown, strong, longer than the anterior -angle setae; 

 intermediate seta longer and thin; lateral seta small; both setae light. 



277 



