160 LIFE HISTORY OF NORTH AMERICAN TICKS. 
the host, but it also attaches on the outside of the ears, on the head, 
on the neck, and sometimes between the toes. Adults collected on 
rabbits have been found to attach readily to bovine hosts and to 
engorge to repletion. : 
Fig. 13.—The rabbit Dermacentor, Dermacentor parumapertus marginatus: Distribution. The large dots 
show localities where the species has been collected in our investigation. The small dots indicate the 
probable range of the species in the United States. (Original.) 
GEOGRAPHICAL DISTRIBUTION. 
(Fig. 13.) 
Mesa City, Arizona, is the type locality for this variety. The 
species is confined to the semiarid and arid west, including Texas 
west of about the 101st meridian, New Mexico, Arizona, southern 
Utah, Nevada, California, and southeastern Oregon. It appears to 
