36 Bishopp — A New Species of Dermacentor. 



near the tip of the prolongation and rather below the general surface of 

 the plate; goblets rather large, 50 per plate, scattered over surface except 

 in the prolongation; supporting cells larger around goblets and around 

 margin of plate where they form a scalloped border, being slightly bulged 

 opposite each marginal goblet; macula oval about 208j* long, aperture 

 elongate. 



Body dark reddish brown ; marginal groove and festoons prominent; 

 postero-median and accessory grooves distinct, of about equal length, 

 reaching nearly to foveae, a number of short pale hairs ventrally ; genital 

 aperture opposite the space between coxae II and III, genital groove 

 distinct; anus transversely oval, about 230 by 194m. 



Type Cat. No. 14575, U. S. National Museum. 



Type host. — Mountain sheep (Oris rnexicanus Merriam). 



Type locality. — Quartzsite, Arizona. 



A male and a female described from a lot of 23 males and 12 females 

 taken on a female mountain sheep September 2, 1911, by Mr. George 

 llut-on. The type female after being described was darkened consider- 

 able and the white made less intense by boiling dry during the process of 

 softening it. Paratypes in Bureau of Entomology collection at Washing- 

 ton, D. (.'., and at Dallas, Texas, under Dallas ace. No. 2352. 



I take pleasure in naming this pretty Dermacentor in honor of my asso- 

 ciate, Mr. W. D. Hunter. 



Mr. Hutson made a special effort to secure an abundance of material of 

 this species and it is to him that I am indebted for the following records 

 of collections: 3 cT (a dozen or more were collected but not sent in as 

 they were dead), July 8, 1010; 16 d\ I $ (unengorged), August 10, 

 1010; 5 cT, 2 $ (unengorged to . 2 \, engorged), August 20, L910; 18 d\ 

 13 $ 'unengorged to fully engorged), December 1. 1010; 23 c?\ 12 9 

 (unengorged to v'o engorged), September 2, 1911. Several specimens, 

 mostly males, escaped when the last collection was made. All of these 

 lots were collected on mountain sheep near Quartzsite, Arizona, at an 

 altitude of from 1500 to 2000 feet. 



All specimens collected agree closely with the types; the males are all 

 of good size and the color markings quite uniform. The number of 

 goblets on the male stigmal plates varies from .">1 to 45 and on the female 

 plates from :'>4 to 50. 



The species runs to D. venustus in .Air. Banks' table. It appears. 

 to be most closely related to venustus but is easily distinguished from 

 that species by many characters, some of which are the much smaller 

 number of goblets on the stigmal plates; stigmal plates not so broad 

 near their posterior ends and in the male with more narrow and longer 

 prolongations; the scutum in each sex with much fewer large punc- 

 tures, and the white marking are quite different; in the female the 

 scutum is much less constricted behind the eyes; the porose areas are not 

 pointed anteriorly ; postero-lateral angles of basis capituli are longer; the 

 dorsal portion of trochanter I is produced into a moderately sharp angle, 

 not broadly rounded as in venustus. 



The largest female collected measured 12.9 x 7.5 x 4.2 mm., length 



