NOTES OX BRITISH TRICHOPTERA. 145 



of fine sand, and lives out of the \yater, but probably amongst 

 the damp moss, &c. at the roots of trees. The insect has not 

 yet been found in this country. 



The insects of the next family, Sericosiomidce, make cases 

 that may be divided into two kinds. The first is a slio^htlv 

 curved tube, formed of verv small stones, arrano;ed en 

 mosaique on the silken tube ; this the larva fixes at one end, 

 and when about to change to pupa it closes the orifice with 

 laro:er stones or veo^etable debris. The o-enera Sericostoma, 

 JVotidobia, Mormonia and Dasajstoma (not British) form 

 cases more or less after this fashion. The other kind of case 

 made by insects of this family is flat, broad and somewhat 

 curved, so that one side appears somewhat convex, and the 

 other concave ; they are also composed of small stones, 

 arranged in the same way, and often with larger stones 

 attached on either side. Professor Westwood has remarked 

 that cases of this kind have a grating at both ends. The 

 genera Silo and Goera make this sort of habitations. We 

 now come to the family Hydroptilidce, the perfect insects of 

 which may be justly called Micro-Trichoptera. I have never 

 found the cases of this family, but according to M. Pictet 

 they are oval or renifoim, open at each end and composed of 

 silk, to which they attached grains of sand. 



The last family of the first group is Leptoceridce. The 

 genus 3Iolanna, m this family, constructs an extraordinary 

 case of fine sand, scutiform, i.e. the tube, which is nearly 

 straight, has broad flat appendages on either side. In 

 Odontocerus the case is a slightly curved tube of sand and 

 small stones, very similar to that of Sericostoma. The ex- 

 tensive genus Leptocerus, and the now restricted one Mysta- 

 cides, make straight or slightly curved, somewhat tapering 

 tubes of sand, to the exterior of which they sometimes affix 

 long straight pieces of wood. In Setodes elongatus, Stephens, 



1864. L 



