1344 SPOTTED FEVER OF THE ROCKY^MOUNTAINS 



organisms may possibly be allied to spirochsetes. He has been 

 unable to cultivate them. 



Fig. 653: Male. 



Fig. 654: Female. 

 Figs. 653 and 654. — Dermacentor andersoni Stiles, 1905. 



The virus can be acquired and transmitted by the larva, the 

 nvmph, and the male or female adults of Dermatocentor andersoni, 



