SYNOPSIS OF THE BRITISH PHRYGANID^I. 85 



Blackish-brown ; anterior wings with a golden-yellow 

 margin, and an oblique longitudinal streak of the 

 same colour. 



Length 2§ — 4 lin. ; exp. 5 — 7 lin. 



Hab. England; Ireland amongst waterfalls; Scotland; 

 sometimes abundant. This remarkable species can- 

 not be confounded with any other. 



Sub-Family 7. Hydropsychides. 

 Maxillary palpi long, not clothed with hair; the last joint 

 longer than the preceding, flexible, multiarticulate; in the 

 labial palpi the same structure occurs; ocelli rarely present 

 (Philopotamns) ; spurs variable in number (3, 4, 4; 2, 4, 4), 

 the four hinder legs always with four long spurs ; antennas 

 either thin and longer than the wings, or thick and shorter ; 

 posterior wings usually shorter than and differently formed 

 to the anterior ; hairy covering variable, sometimes very 

 dense and long. 



Case immovably attached to stones, constructed of small 

 irregular stones, sometimes twisted, tubular. The larvae live 

 principally in rapid streams. 



The species, which are very difficult to separate, have 

 usually a very uniform coloration, and are still greatly in 

 want of further investigation. 



I divide the missing: genera as follows: — 



I. Spurs 3, 4, 4. Polycextropus, Plectrocnemia, 

 Cyrnus. 

 II. Spurs 2, 4, 4. Philopotamus, Hydropsyche, 

 Aphelocheira, Anticyra, Ti- 



NODES. 



(with 25 species). 

 Kbnigsberg, 14 September, 1858. 



