32 Bishopp — A New Species of Dermacentor. 



Material in Bureau of Entomology collection in Washington, I). ('., 

 and at Dallas laboratory under Dallas Ace. No. 683. 



As Banks has pointed out (Rev. of Ixodoidea, 1908, p. 27 ) Neumann's 

 I. bicornis is very close to this species if not identical with it. The larger 

 scutum of bicornis and the greater length of article II as compared with 

 article III of the palpi, the larger external spine in coxae I, and the three 

 files of teeth on the base of the hypostome (in diversifossus there are two 

 tiles at base, three in middle and four at tip of hypostome) indicate that 

 bicornis may be entitled to varietal rank. The discovery of the male 

 of bicornis would undoubtedly aid materially in determining the proper 

 standing of this species. 



The dentition of the hypostome of the male of diversifossus is of a type 

 similar to that of I. ricinus. The dentition of the hypostome in both 

 sexes, the great length of tarsi I as compared with metatarsi I, the oval 

 scutum of the female and other points, suggest a relationship to the 

 ricinus group. 



Ixodes texanus Banks. 



Until recently but two lots of specimens of this species had been col- 

 lected, other than the type material. One of these lots, as recorded by 

 Nuttall and Warburton, was collected by V. L. Kellogg on gray squirrel, 

 July, 1890, at King's River, Calif. The other is a single well engorged 

 female in Mr. Banks' collection. This specimen was taken on Mustela 

 pennanti at Trout Lake, Wash., March 8, 1901. Nuttall and Warburton 

 also record a collection consisting of a single female taken on Procyon lotor 

 at Mt. Lehman, B. C, by Dr. S. Hadwen during January, 1910. During 

 the past two years, however, the agents of the Bureau of Entomology 

 have collected a considerable amount of material, thus adding much to 

 our knowledge of the distribution, hosts and seasonal occurrence of this 

 species. The collection from which the type material was selected con- 

 sisted of 9 9 , unengorged to one-fourth engorged, and a few larvae, taken 

 on raccoon at Oakville, Texas, November 30, 1908, by Mitchell and 

 Bishopp. In south Texas, Messrs. F. C. Pratt and C. T. Atkinson, dur- 

 ing 1910, made collections of this species as follows : 9 9 on raccoon, 

 Sabinal, February 4; 1 9 on squirrel, Sabinal, April 5; 1 9 on civit cat, 

 Utopia, September 11; -7 9,-4 nymphs, on raccoon, Sabinal, November 

 12. In the Bitter Loot Valley of Montana near Florence, Messrs. YV. Y. 

 King and C. Birdseye have collected a considerable amount of material. 

 During 1910 the following collections were made in that vicinity: 2 9 on 

 marten {Mustela c. origenes), March 13; 3 9 on weasel (Putorius ari- 

 zonensis), June 10; 2 9, H larvae on pine squirrel (Sciurus h. richard- 

 soni), July 16; 2 9,6 nymphs and some larvae on pine squirrel, July 

 16; 16 9, 1 nymph, 19 larvae, on pine squirrel, August 16. During 

 1911 the following collections were made: 3 9 on marten, Lo Lo Hot 

 Springs, Mont., March; 23 9> 13 nymphs on pine squirrel, Florence, 

 Mont., July 26; 3 9> 8 nymphs on pine squirrel, Florence, Mont., 

 August 20. Mr. C. Birdseye obtained 2 females (one-half and one-third 



