AMERICAN TROUT-STREAM INSECTS 



though there were present all the time small ones 

 a little larger than mosquitoes. The most plentiful 

 insects in the daytime were fair-sized gnats and 

 two-wing flies. 



No. 1. Black dose. This began its rise on a 

 rainy day, the 15th, and continued thick for several 

 days. The half-submerged stones at the water's 

 edge were fairly covered with the flat larvae of this 

 insect; some creeping up the stones, others just 

 splitting open with the insect emerging from the 

 case. The larva is a deep, shiny black, with two 

 white marks over the head. The insect comes out 

 with wings fully matured. I picked out a number 

 by the wings while the larva skin was still attached 

 to the tail of the fly. These insects fly slowly 

 along, going up high over the water, but they are 

 easily captured in taking the first flight. They do 

 not appear on bright, hot days till quite late at 

 evening ; on wet days they are thick on the water. 



No. 2. Small pinktail. Somewhat similar to 

 the much larger specimen of that name shown in 

 July. The wings of this insect, however, are 

 brighter yellow, and underneath the body the first 

 three and last three sections are pale lemon-yellow, 

 the middle three sections being pink on top and be- 

 low. There is a black spot in the middle of the eye. 

 Small pinktails are quite abundant, especially at 

 evenings, and sometimes come out late afternoons. 



No. 3. Green-ribbed drake. A very pretty in- 



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