520 



2 (3). Area "b" of anal legs with a small teat -shaped process near the 



distodorsal seta posteriorly 1. Berea Steph. (p. 649) 



3 (2). Distodorsal process of anal leg high, narrow, conical; distodorsal 



seta thick 2. Ernodes Wall. (p. 657) 



4 (l). Mandibles with lateral distodorsal chaetoids at the end; hind tibia 



as long as tarsus, secondary setae of tibia small, restricted to 

 distodorsal area; gills present 3. Beraeodes Eaton (p. 659) 



Pupa 



1 (4). Distal part of mandibles straight, relatively wide, slightly curved at 



apex; mid-tarsus bare or with sparse setae; gills and holding 

 apparatus absent; anal appendages short, wide at the base; occurring 

 outside water, among humid detritus or moss. 



2 (3). Length 5—6 mm; length of case 6—7 mnn; western part of European 



USSR 1. Beraea Steph. (p. 649) 



3 (2). Length 4 mm; case length 4—5 mm; Caucasus 



2. Ernodes Wall. (p. 657) 



4 (l). Distal part of mandibles narrow, sickle-shaped; mid-tarsus with 



natatorial setae; gills and holding apparatus present; anal 



appendages rodlike, long; small brooks 



3. Beraeodes Eaton (p. 659) 



1. Genus Beraea Stephens 



' Full-grown larva. Light, length 5—7 mm. Head and pronotum reddish 

 yellow or brownish yellow. Mandibles with a dense brush in median 

 depression. Gills absent. Area "b" of anal legs with short, teat -shaped 

 process near the large seta. 



Pupa. Distal part of mandibles straight, wide, with slightly curved apex. 

 Mid-tarsus bare or with sparse, small setae. Gills and holding apparatus 

 absent. Anal appendages short, lobe -shaped, with knifelike posterior margin. 



Mode of life and habitats. Near springs, outside water, in moss 

 and in coarse, humid, plant detritus. 



Distribution. European USSR, Middle Asia. In addition, Europe, 

 North America. 



Key to Species 

 Full-grown larva 



1 (2). Head and pronotum 3^ellow, or orange yellow; basal brush of 



chaetoids in median depression of right mandible longer than on 



left mandible 1. B. pullata Curt. (p. 650) 



2 (1). Head and pronotum brownish red; basal brush of chaetoids of about 



equal length on both mandibles . 2. B. maurus Curt. (p. 654) 



649 



