248 SALMONIA. 



of moths : at this season, 7iow, I should say, 

 the few flies that appear are generally seen in 

 the day-time. The ep/fem^rce, another class 

 of flies peculiarly interesting to the fisher- 

 man, differ from the phryganeae in carrying 

 their wings perpendicularly on their backs, 

 and in having long filaments or hairs in their 

 tails. The March brown, {see Jig. 8.) the 

 various shades of duns, [see Jigs. 5, 6, and 7.) 

 which I described to you on a former occa- 

 sion; the green {seejgs. 9 and 10.) and white 

 Mayfly, the red spinner, [see Jig. 11.) are all 

 of the class ephemeras. These flies are pro- 

 duced from larvae which inhabit the water, 

 which can both crawl and swim, and which 

 generally live in holes they make in the bot- 

 tom. They change their coats several times 

 before they become nymphae. They quit 

 their skin on the surface of the water, but 

 even after they are flies, they have another 

 transformation to undergo before they are 

 perfect animals fitted for generation. They 

 make use of their wings only to fly to some 

 dry bank, or trunk of a tree, where they gra- 

 dually disencumber themselves of the whole 



