. The life history and bionomics of some North American ticks . Xo specimens of this variety have been taken on otherhosts than jack rabbit and cottontail rabbit. While very few larva?and nymphs have been collected on rabbits, it would appear fromthe fact that no specimens have been taken on any other animalthat the rabbit is the principal host of those stages. We have en-gorged larva? in our rearing experiments on the fox squirrel, guineapig, and bovine, as well as rabbit, and nymphs have been engorgedon the guinea pig and rabbit. Although a Large number of unengorged adults have been col-lec
. The life history and bionomics of some North American ticks . Xo specimens of this variety have been taken on otherhosts than jack rabbit and cottontail rabbit. While very few larva?and nymphs have been collected on rabbits, it would appear fromthe fact that no specimens have been taken on any other animalthat the rabbit is the principal host of those stages. We have en-gorged larva? in our rearing experiments on the fox squirrel, guineapig, and bovine, as well as rabbit, and nymphs have been engorgedon the guinea pig and rabbit. Although a Large number of unengorged adults have been col-lected, very few fully engorged females have been obtained. It wouldseem that a large number of them are scratched off by the host beforebecoming replete. The species is found principally in the ears of 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 onrabbits have been found to attach readily to bovine hosts and toengorge to Fig. 13.—The rabbit Dermacentor, Dermacentor pammapcrtus marginatus: Distribution. The large dotsshow localities where the species has been collected in our investigation. The small dots indicate theprobable range of the species in the United States. (Original.) GEOGRAPHICAL DISTRIBUTION. (Fig. 13.) Mesa City, Arizona, is the type locality for this variety. Thespecies is confined to the semiarid and arid west, including Texaswest of about the 101st meridian, New Mexico, Arizona, southernUtah, Nevada, California, and southeastern Oregon. It appears to Bui. 106, Bureau of Entomology U. S. Dept. of Agriculture. Plate XIII.
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