110 OLD FLIES IN NEW DRESSES 



much according to the water they inhabit. 

 I have seen them a pale yellow colour in 

 some streams, while in others they are 

 almost black. The commonest colour is 

 however a reddish-yellow. 



I find that the general idea is that these 

 Shrimps travel through the water in quick 

 leaps by bending up their bodies and 

 straightening them out again. I have 

 however never seen them do this, though 

 I have kept them in an aquarium and 

 watched them very carefully. 



What I have seen is, that they use their 

 legs to swim with, moving them as though 

 they were walking very rapidly. They 

 cannot, however, walk when they are taken 

 out of the water, but lie perfectly helpless 

 upon their sides. In a stream where the 

 Fresh-water Shrimp swims, it seems unable 

 to progress up stream, or at any rate, if it 

 does it moves very slowly ; when they wish 

 to go up stream they crawl along the 

 bottom. They can, however, as a rule, 

 maintain the same position against the 

 current. 



I have found the following to be the best 

 way to dress an imitation of the Fresh- water 



