78 NEUROPTERA. 



last joint short, cylindrical, sometimes flexible (as also in 

 Leptocerides), but never multiarticulate ; ocelli generally 

 present (only wanting in Beraed) ; spurs variable in number 

 (3, 4, 4 ; 2, 4, 4 ; 1, 4, 4 ; 0, 4, 4 ; 2, 2, 4), the four hinder 

 legs with four long spurs (except in Beraed) ; antennae 

 moderately stout, as long as, or shorter than, the wings; 

 anterior and posterior wings nearly of equal size and form ; 

 the clothing of hair is usually thin and short. 



The cases are immovably fastened to stones, and are ir- 

 regularly constructed of small stones, lined internally with 

 silk ; into these the larvae, which live free in the water, re- 

 tract themselves, and spin, for the pupa, a completely closed 

 longish oval case of a gelatinous substance ; this lies free in 

 the stony case. The larvae are particularly fond of rapid 

 mountain streams. 



I refer to the Rhyacophilides, all the species in which the 

 last joint of the palpi is not multiarticulate, and have, there- 

 fore, united Chimarrha with them, but transferred Tinodes 

 and Aiiticyra to the Bydropsychides. 



Genus Rhyacophila, Pictet. 



Antennae somewhat shorter than the wings ; maxillary 

 palpi short, the first two joints very short, nearly globular, 

 the remainder thinner, cylindrical, long, of uniform size; 

 ocelli present ; wings nearly similar in size and form ; dis- 

 coidal cell open ; veins strong ; clothing of hairs very slight ; 

 spurs 3, 4, 4 ; intermediate legs of the female not dilated ; 

 abdomen of the female obtusely conical. 



Case as above described. 



The section B. of Stephens, in which the females have 

 dilated intermediate legs, does not belong to Rhyacophila; 

 the only species (R. nebulosus} is a Bydropsyche. 



