TRICHOPTERA 81 



some living larvae, and get some new, clean nets "made to 

 order" in the laboratory (see p. 197). 



6. Set up some jars or aquaria with pond caddisworms in 

 them and water plants. 



7. Mount for exhibition a few adult caddisflies. Use a 

 spreading board and extend the wings fully. 



8. Make slide mounts of the head and legs and draghooks 

 of the larva.* 



9. Make slide mounts of the head of the pupa to show its 

 big mandibles. 



10. Make slide mounts of the wings of the adult caddisfly. 



11. Routine (see p. 204). 



LA BORA TOR Y PROGRA M 



A. The Study of Living Specimens. 



1. At the net-maker's trough, if the larvae have established 

 themselves in it, observe: 



(a) The nets, opening upstream, distended by the 

 current, attached directly below and with stay- 

 lines above, tapering to the finer meshed feeding 

 surface at the bottom where the head of the larva 

 enters. 



* Inside the pupal case, at the rear end of the pupa will be found the 

 crumpled-up, cast-off skin of the larva, with these hard parts perfectly 

 preserved and freed from muscles and other tissues, furnishing the best of 

 material for making these slide mounts. 



