3. Genus Beraeodes Eaton 



Full-grown larva. Length 7—9 mm. Mandibles with distal rows of 

 short, stiff chaetoids laterally, in addition to brush in median depression. 

 Hind tibia and hind tarsus longer than femur; tarsus without secondary 

 setae, tibia with few setae; claw of hind legs thin, slightly curved, long. 

 Claw of anal legs with 2 dorsal denticles. 



Case conical, curved, made of sand grains. 



Pupa. Labrum slightly oblong; mandibles with sickle -shaped distal 

 part. Midlegs natatorial. Gills and holding apparatus present. 



Mode of life and habitats. Rheophilic, in small brooks. 



Distribution. Western border area of European USSR. In addition, 

 Europe. 



1. Beraeodes minuta Linne 



Morton, 1884:27-29; 1890 : 233-235, Plate I, Figure 11, Plate 2, 

 Figures 1-8. - Klapalek, 1 893 : 80-84, Figures 1-10. - Struck, 1 900 : 24, 

 Figure 37; 1903 : Plate III, Figure 1. - Ulmer, 1903: 96, Figures 60, 99, 116; 

 1903b:218.- Thienemann, 1905b: 555.- Siltala, 1905:33-34; 1907:452—454.- 

 Ulmer, 1909:242-243, 305-306. Figures 369, a, b, d, 445a. b. - Lestage, 

 1921:942-950, Figures 337.- Hickin, 1959:83-85, Figures 1-10. 



Pull-grown larva. Length 9.0— 9.3 mm (Figure 850). Head brown 

 dorsally, with blackish pattern, other parts light yellow, with 2 large, brown 

 dots lateral to coronal suture (Figure 851, A). Ventral side with black line 

 on margin of occipital foramen. Gula oblong, extending from anterior to 

 posterior margin of head, fused with lateral sclerites and clearly separated 

 by ridges of gular sutures; pregula dark. Antennae as in Figure 851, B. 

 Labrum short, with distinct anterior-angle area. Mandibles 

 (Figure 851, C, D) convex laterally, humplike; basal setae reaching almost 

 to apex; both mandibles with a dense, short brush of chaetoids in median 

 depression; chaetoids of lateral, distal row small. Sclerites of submentum 

 narrow in the middle; seta situated on sclerite. 



Number and arrangement of gills of B. m. i n u t a (after Klapalek) 



Segment 



Dorsal 



Pleural 



Ventral 



1 



6 



2 



- 



2 



6 



2 



2 



3 



5 





4 



4 



3 





2 



5 



1 





2 



659 



