Cooley & Kohls: Argasidae of N. America, etc. 55 



group of hairs on the margin on each side back of the palpi. Palpi moderate 

 in length and with a few dorsal hairs. Article 1 with a narrow, knife-edge 

 flange extending over the base of the hypostome; articles 2, 3, and 4 free. 



Hypostome. — Long, with the apex broadly pointed. Denticles arranged 

 2 / 2 , with about six in each file. Posthypostomal hairs, usually found in this 

 genus, are absent. Length, 0.57. 



Folds. — Coxal and supracoxal folds are distinct. 



Grooves. — True grooves are absent though a median elongated depression 

 posterior to the anus suggests a median postanal groove. 



Sexual opening. — Placed at the level of the posterior ends of coxae I. 



Anus. — In an oval pattern. 



Eyes. — Absent. 



NYMPH 



The single specimen from which this species was described was received 

 by Miss Mclvor as a living nymph. It was fed and in due course emerged as 

 an adult. Thus, the cast skin was available for study and reveals some nymphal 

 characters which differ mildly from the adult as follows: Reticulation and pits 

 on the dorsum more shallow and less definite. Dorsal humps and subapical 

 dorsal protuberances less prominent. Length of hypostome, 0.48. Length of 

 tarsus I, 0.6; metatarsus, 0.42; length of tarsus IV, 0.84; metatarsus, 0.6. 



HOST AND DISTRIBUTION 



The single specimen was found by Dr. E. Raymond Hall, Museum of 

 Vertebrate Zoology, University of California, Berkeley, in a shipment of skins 

 sent by Mr. Frank Wilson, Rox, Nevada, which contained pelts of a striped 

 skunk, swift foxes, and coyotes. The host of this tick is presumably one of 

 these three animals. The specimen was given to Miss Barbara C. Mclvor, The 

 Medical Center, University of California, San Francisco, California, who has 

 kindly given the authors full opportunity to study, figure, and photograph 

 the specimen. 



