V CADDIS-WORMS 257 



worms is very great. A number of forms, characteristic 

 of particular species, genera, and families are here 

 noted. The information given is for the most part 

 taken from McLachlan's TricJioptera of the Etiropean 

 Fauna. 



Bits of leaves or stems placed side by side so as to form a 

 spiral band, passing many times round the case, which is open 

 at both ends, tapering when small, parallel-sided later. Still 

 water. Fam. Phrygaiieidcc. Tricenodes forms a similar but 

 more tapering case. 



Case of entire or nearly entire leaves of trees, flattish and 

 irregular. Still water. Glyphotcelius. 



Case of fibres or sticks placed transversely, sometimes 

 with shells added. Still water. Liiiinophilus rhombiciis. 



Various materials, but especially shells of water mollusks. 

 Still water. Livinophilus Jlavicornis. 



Case of sand, bits of grass, etc., to which long pieces of wood 

 are added. Still water. LininopJiilus htnatus. 



Curved cylindrical tube of fine sand. Still water. Limtio- 

 pJiilus vittaius. When the tube, as in this case, is curved, the 

 ( onvex side is next to the back of the larva. 



Case cylindrical, of bits of dead leaves, joined by their edges ; 

 closed with stones before pupation. Shallow running water. 

 IJnniophilus auricula. 



At first of vegetable fragments arranged obliquely to form a 

 cylindrical tube, afterwards of stones only. Pupal case shorter, 

 and more conical, closed with stones, and attached a number 

 together to stones. Still water. Lininophilus gi-iseus. 



Case of sand, cylindrical, scarcely curved, mouth-end oblique. 

 I'upal case shorter, attached a number together by the mouth- 

 end. Running water. Limnopliilus extricatus. 



Case of small stones and vegetable matter. Long twigs 

 attached to one end. Mouth-end oblique. Running water. 

 Anabolia. 



Case of small stones, fixed or lodged in the bed of a stream. 

 Stenophylax. 



Case of small stones. In swift, clear streams. Micropterna 

 (see Fig. 82. 17.) * 



S 



