Cooley & Kohls: Argasidae of N. America, etc. 65 



It is apparent that O. parkeri is less avid in attacking man than are some 

 other species in the genus. Davis (1939) reported that this tick when placed 

 on the bare arm feeds promptly. However, neither he not his assistants, or 

 Jellison, were bitten while collecting this species, though engaged in the work 

 for hours at a time. 



In summary, the known hosts of O. parkeri are: Citellus sp., C. columbi- 

 anus, C. nchardsoni, Cynomys sp., Cyn. leucurus, Marmota sp., Peromyscus 

 sp., Lepus sp., Sylvilagus sp., Mustela sp., Speotyto cunicularia, and man. 



DISTRIBUTION 



Ormthodoros parkeri has been collected in widely separated areas in the 

 following nine Western States: California, Colorado, Idaho, Montana, 

 Nevada, Oregon, Utah, Washington, and Wyoming. Collection localities are 

 shown in figure 26. 



