median setae in the middle. Mandibles reddish brown. Wing sheaths 

 narrow, pointed, reaching in female pupae the middle of the 7th abdominal 

 segment, the end of the body in male pupae. Grappling apparatus situated 

 on presegmental plates on segments 3—6, postsegmental plates on 

 segments 3—5; it is better developed in male pupae than in female pupae. 

 End of abdomen of male pupa with an obtuse notch in the middle. Case as 

 in the larva. 



Mode of life and habitats. Brooks and rivulets, mainly in calm 

 places, among vegetation or on stones. 



Distribution. European USSR. In addition, Europe, Algeria, Iran, 

 Pakistan. 



4. Hydroptila pulchricornis Pictet 



Siltala, 1904b: 15-1 6, Figure 4, a-f . - Ulmer, 1909:224, 292. - Lestage, 

 1921,449. 



Full-grown larva. Length 3.0— 4.0 mm. Larvae light; ground color of 

 sclerotized parts light yellow; dark parts small. Dorsal side of head dark 

 brown posteriorly, with light dots; Frontoclypeus dark only anteriorly; 

 greater part of dorsal surface of head light. Labrum without thin hairs near 

 the anterior margin. 



Pronotum with broad, blackish brown border posteriorly and laterally; 

 middle of sclerite brownish, with indistinct light spots; broad stripe in the 

 anterior and lateral parts light yellow. Meso- and metanotum with a brown 

 border posteriorly; a small area near the posterior margin of the segments 

 and an area in the middle, near the median suture, slightly dark; greater 

 part of sclerites light. 



Length of case 3.5— 5.0 mm; tubercle on dorsum not always present; 

 if absent, the case appears low; covering of case consisting of fine sand 

 grains. 



Mode of life and habitats. Rivulets and lakes, among riparian 

 vegetation and on stones. 



Distribution. Northwest and north of USSR. In addition, Europe. 



Genus 3. Oxyethira Eaton 



Full-grown larva. Length 2.8— 4.5 mm. Head slightly laterally 

 compressed, oblong in dorsal view, uniformly high. Sutures well marked, 

 gular suture, except the anterior branches, forming short posterior branches 

 which surround the small posterior gula; gula separated from pregula by a 

 ridge. Sensilla of antennae longer than in the genera described before; 

 a long curved seta in its middle or slightly nearer its distal end. Setae of 

 head, except a few setae, moderately long; seta 9 is the longest seta of the 

 head. Left mandible with projecting blades; teeth on them small; blades 

 of right mandible little marked and only in its distal part; teeth present 

 only near apex of the mandible. 

 339 Thoracic tergites narrowing posteriorly; pronotum covering the sides of 

 the segment more completely than on the meso- and metanotum; secondary 

 anterior -margin setae few in number. 



373 



