6 FARMERS’ BULLETIN 683. 
The infestations of the human flea are usually less heavy than in 
the extreme cases above mentioned, and the breeding places are often 
more widely extended. 
A number of instances in the Southern and Central-Western States 
have come to notice where hogs appear to have been the source of 
gross infestations of the human flea. The adult fleas feed on the 
hogs, and breeding takes place in the beds of these animals. In some 
Ss 
TS 
v4 
Fic. 4.—The human fiea: Adult male. Greatly enlarged. Note the difference in the 
shape of the abdomen of the male as compared with that of the female (fig. 3). 
(Author’s illustration.) 
instances the source of infestation is in the hog runs, but more 
usually it is derived from hogs sleeping under houses. 
FLEAS INJURIOUS TO POULTRY AND DOMESTIC ANIMALS. 
Fortunately the higher domestic animals are comparatively free 
from flea attacks. Horses, cattle, sheep, and goats are very seldom 
annoyed, although a few instances_have come to our attention in 
which the sticktight flea infested horses. Hogs are infested to some 
extent, but seldom heavily enough to do any damage. 
