SYNOPSIS OF THE BRITISH PHRYGANID^. 105 



Genus Brachycentrus, Curtis, Stephens. 

 Pogonostoma, Ramb. ; Hydronautia, Kolen. 



Maxillary palpi of the males 2- (?) jointed, short, slender, 

 curved, strongly hairy ; antennas as long as the wings, basal 

 joint as long as the head; wings elliptical at the apex, 

 densely clothed with hair; spurs 2, 3, 3; tibiae without 

 spines ; spurs very short. 



Case conical, straight, composed of sand ; the larvae live 

 in marshes, and even in the brackish water at the mouths of 

 rivers. 



50. Brachycentrus subnubilus, Curt. Phil. Mag. 215; 

 Steph. 111. 182, 1 (§); B. concolor, Steph. 111. 

 182, 2 (£); B. costalis, Steph. 111. 182, 3 (2 

 rubbed) ; Ph. tincta, Zett. ; P. vernum, Ramb. ; 

 H. maculata, Kolen. 



Black, clothed with grey hairs ; anterior wings grey, 

 with large yellowish spots ; posterior wings brownish- 

 grey ; legs yellowish-white, thighs grey. 



Length 3^ lin. ; exp. 6| lin. 



Hab. London, Devonshire and New Forest, in June. 



Sub-Family IV. Hydroptilides. 



Maxillary palpi of the males 4-jointed; labial palpi 

 with the apical joint thickened; antennae shorter than the 

 wings, thick, moniliform ; wings very narrow, pointed, lan- 

 ceolate, clothed with long hairs; posterior wings not folded; 

 anterior legs without spurs ; number of spurs variable (0, 2, 4; 

 0,3,4). ' 



The minute species of this genus are still very insufficiently 

 investigated. 



Case membranous, compressed laterally ; the larvae live in 

 still water. 



