Photo by) [A. Bangield. Photo by] [¥. J. Ward, F.ES. 
FLEAS. 
Fleas were once upon a time two-winged flies; but ages of parasitic habits have caused the loss of limbs rendered unnecessary, while the legs, on the other hand, have become 
marvellously developed, so that the insect is enabled to perform prodigious jumping feats, The species shown here are: on the left hand, the male Flea of the dog, and, on the right, 
the male Flea of the hedgehog, both magnified about fifty times, 
