214 THE TRICHOPTERA. 



gist, no less than to the angler, who finds amongst 

 them some of his most abundant and successful 



\ 



Phryganea grandis. 



natural surface baits. They constitute the third sub- 

 order of Neuropterous insects, that of the 



Trichoptera*, 



so called from the anterior, and sometimes the pos- 

 terior wings being more or less clothed with minute 

 hairs. This, however, is not the sole character upon 

 which their separation from the rest of the Neuro- 

 ptera is founded, — the hinder wings are broader than 

 the anterior, especially at the base, and this part of 

 the wing is folded in repose to enable it to be con- 

 cealed beneath the upper pair, which lie obliquely 

 upon the sides of the body, so as to form a roof-like 

 covering. The structure of the mouth also is remark- 

 able, the mandibles being quite rudimentary, and the 

 maxiUse reduced to a very useless condition, so that 

 the mouth appears to be incapable of taking food, 

 either by biting or suction, whilst the palpi on the 

 contrary are greatly developed.. The body is rather 

 soft, and thickly clothed with hair; the head is of 

 moderate size, with very prominent eyes, and with 

 * Gr. thrix, hair, pteron, a wing. 



il 



