Mode of life and habitats. Lakes, rivers and rivulets, on stones, 

 sometimes on plants. 



Distribution. USSR: north, west and central part of the European 

 USSR. In addition, southern, Central and northern Europe, Algeria. 



2. Hydroptila sparsa Curtis 



Pictet, 1834:225, Plate XX, Figure 11.— Kolenati, 1848:105.- Klapalek, 

 1897:1-16, Figures 1-6.- Ulmer, 1903:135; 1909:225, 292.- Siltala, 1904b: 

 16-19, Figure 5, a-h. - Lestage, 1921:449-450. 



Full-grown larva. Length 3.0— 4.0 mm. Ground color of sclerites 

 buff yellow, but the greater part of the sclerites is occupied by dark brown 

 or blackish brown areas, so that the sclerotized parts are darker than in 

 H. femoralis. The whole frontoclypeus and posterior half of the head 

 are dark brown; only the area around the eyes remains light on the dorsal 

 side; more or less distinct light dots On the dark background; ventral side of 

 head lighter. 



Pronotum dark brown, in its greater part, with numerous light spots; 

 posterior margin blackish; meso- and metanotum brown, with light spots 

 near the median line; posterior margin of sclerites with a dark border 

 interrupted by light parts. 



The complete case is oblong, loose, with a slightly convex dorsal surface 

 and straight ventral surface. 



Pupa. Length 2.4— 3.1 mm. Labrum, like in H. f e mo r a 1 i s, with one 

 pair of small anterior -margin setae. Wing sheaths reaching abdominal 

 337 segment 7 or the end of the body. Posterior margin of end of male pupa 

 with a small median notch in the middle and small lateral lobes at the 

 sides; in dorsal view process of developing penis is visible ventrally. 



Pupal case 2.9— 4.7 mm long, gray or brownish, lighter than in H. femo- 

 ralis, more elongate (Figure 423); the attachment plates have no stalks. 



Mode of life and habitats. Slowly flowing brooks and rivulets. 



Distribution. USSR: west and northwest. In addition, Europe, Iran. 



3. Hydroptila maclachlani Klap. 



Klapalek, 1893:135-138, Figure 37.- Ulmer, 1903:135; 1909:224, 292.- 

 Siltala, 1904b:18— 19.— Lestage, 1921 :445— 449. — Jacquemart et Coineau, 

 1962:61-76, Figures 65-74. 



Full-grown larva. Length 3.7 mm, width at abdominal segment 5 

 0.7 mm. Head brownish yellow, slightly darker posteriorly; light spots 

 on the brown background indistinct; setae as in Hydroptila femoralis, 

 with minor differences (Figure 424). 



Labrum with parallel sides; numerous hairs (hairlike spines) near the 

 anterior margin, on the membranous part; dorsal sclerite (unlike in 

 H. f e mo r al i s, see Figure 414) without hairs anteriorly near the margin 

 338 (Siltala, 1904b:19); setae as in H. femoralis (Figure 424). Mandibles 



brown; blade of left mandible without teeth; a brush of short chetoids in the 

 median depression; ventral side of right mandible with a small blunt, sub- 

 apical tooth. 



371 



