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ARTICULATA. INSECTA. 



tail ; they are, however, immediately bent under the 

 body again. Several species of these minute crea- 

 tures, scarcely larger than a flea, may be often seen 

 leaping about the surface of water in tubs, and damp 

 places ; and one still smaller, of a greyish black, 

 accumulates in countless numbers on water in ruts 

 and horse-prints on roads, looking like grains of gun- 

 powder, and frequently completely hiding the sur- 

 face. Another species we have noticed in Canada, 

 which appears in numbers, hopping about the surface 

 of snow, just after it has fallen. 



This genus seems to be allied to the Myriapoda, 

 in having simple eyes arranged in a series on each 

 side of the head, as is the case with the Scolopendra. 

 But while the Myriapoda have but four such eyes 

 on each side, the Podura has eight, set in an oval 

 space. 



