44 



HALF-HOURS IN THE GREEN LANES. 



p. 3r> 



Limnephilus pellucidus (Fig. 35), whose case is formed 

 of entire leaves, or large pieces usually of willow or 

 poplar. Sometimes, it is composed of pieces cut out 

 from the stems of bulrushes, &c., and flatly laid 

 over each other, so as to form broadish masses. In 

 the interior of these is the slender tube containing 

 the larva. The leaves, &c., form a 

 capital protection, and you have 

 to pull the pieces quite from each 

 other before you can fully decide that 

 they were formed as worm-tubes. 

 We have also caddis-cases of yet 

 other species, with straight or curved 

 tubes, sometimes gradually tapering 

 Case of Limnephilus to one end. Such are the cases of 

 Sericostoma, Setodes, &c. They are 

 formed of sand, or very small stones, 

 neatly cemented together. Some 

 species of Setodes make delicate 

 little tubes > entirely formed of 

 silky secretion, without any admix- 

 ture of extraneous objects. Not 

 uncommon in ditches and tarns, is 

 the caddis-tube of the Molanna 

 anqmtata (Fig. 38). It will be met 



' , , 



with most abundantly in ponds 



having a sandy bottom. The tube is long, broad, 

 and rather flattened, and is composed of fine sand 

 grains cemented together. The upper surface, at 

 the front encf, projects over the larva, so that it 



p. 36 



Fig. 37. 



Case of Setodes. 



