THE STUDY OF ENTOMOLOGY 223 



imagines spent, or after the work of procreation is 

 complete, will have their wings flat on the water and 

 approximately at right angles to the line of the body. 

 A casual examination will show the general outline, 

 the taper and curve of the 

 Mayflies, duns and body, and the assistance of 



spinners. the x 10 lens will also reveal 



the presence of two or three 

 thread-like tails which are called whisks by the angler 

 and setcB by the entomologist. Some genera have 

 two and others three tails, and it often happens that 

 one or more of these have been broken off, even after 

 the most careful handling. It is for this reason that I 

 advise the use of the lens, as with it the angler will in 

 most cases be able to distinguish one or two joints of 

 the tails close to the end of the body. 



Fig. 35. Caperer x 2 



Fig. 35 is a caddis-fly called the caperer, showing 



the typical appearance of these 

 Caddis-flies. . ^ . c, ™, ^ , 



msects m prohle. 1 he student 



will note the long multi-articulate antennae and the four 



