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Recent discoveries showing the importance of ticks as carriers of disease, not only to animals but also to man, have rendered careful study of the structure and habits of these pests of great significance for preventive medicine. In this bulletin Stiles considers the North American species, and finds that the microscopic structure of the stigmal plates is a taxonomic character of considerable importance, upon the basis of which the Dermacentor of this country can be divided into four groups. The Montana tick, which has been shown especially by the extensive studies of the late Dr. Ricketts, to be a means of transmission of Rocky Mountain spotted fever, is now found to be a distinct and new species (Dermacentor andersoni, according to Stiles), although it has been referred to in the literature of this disease as D. occidentalis, largely on the authority of Stiles himself. The tick which Salmon and Stiles
The Taxonomic Value of the Microscopic Structure of the Stigmal Plates in the Tick Genus Dermacentor.. JAMA. 1910;55(23):2002. doi:10.1001/jama.1910.04330230060032