Cooley & Kohls: Argasidae of N. America, etc. 41 



Length about 0.12. (Description and drawing made with the hypostome in 

 situ — not mounted.) 



Folds. — Coxal and supracoxal fo!ds present. 



Grooves. — Dorso-ventral and preanal grooves present. Median postanal 

 and transverse postanal grooves absent. 



Eyes. — Absent. 



Anus. — In a nearly circular frame. 



It is to be noted that although the specimen is in an early nymphal stage 

 the dorsal humps on the tarsi are well developed. Since in all known American 

 species the dorsal humps are poorly developed in the early nymphal stages and 

 become progressively larger in successive stages, it appears likely either that 

 the adult would be of a species of small size, or if of average size, the humps 

 would be unusually prominent. 



This tick resembles the African species, O. savignyi. 



HOST AND DISTRIBUTION 



Known only on Peromyscus maniculatus . The one nymph was collected 

 near Bluff, San Juan County, Utah, August 24, 1939. 



