304 
Fleas on Rodents 
Squirrel fleas are most numerous on the hind quarters. 
These observations, while they are not to be insisted upon as throwing 
any special light upon the regional distribution of buboes in naturally 
infected plague rats, are of particular interest in showing the very con¬ 
stant preference of Ct. musculi for the region of the head and neck. 
In regard to the other species of fleas it should be borne in mind that 
the skin areas are not of equal dimensions; that of the head and neck 
being smallest; that of the hind quarters being the largest; and the 
skin area of the fore quarters being between these in size. 
