230 LAKES AND RIVERS, 



If April was more productive than March, May is 

 more productive than April in fauna and flora. The 

 characteristic flies known as the Ephemeridcz, proverbial 

 for their shortness of life, hover over the ponds and 

 afford food to the swallows, trout, and larger insects. 

 The Whirligig Beetles, Gyrinida^ are exceedingly 



WHIRLIGIG BEETLES AT SPORT. 



abundant, and amusing by their lively motions. They 

 swim with immense rapidity, and seem to have four 

 eyes, two of which look down into the water, and two 



