206 Bishopp — Some New North American Ixodidx. 



Ixodes sculptus Neum. 



But a few specimens of this species have been collected and these come 

 from widely separated localities. 



The very narrow basis capituli, the incurved lateral carinae and small 

 stigmal plates, differentiate it from the Ixodes cookei group. The some- 

 what elongate scutum, narrow capitulum, rattier slender palpi and small 

 stigmal plates indicate a relationship with I. angustus. 



In the type specimen the greatest width of the basis capituli (at base 

 of palpi) is 467m- The width between the centers of the postero-lateral 

 angles, which are distinct and incurved, is 373 m. The area bearing the 

 porose areas is distinctly elevated above the lateral portions where the 

 palpi articulate. This gives the appearance of still greater narrowness. 

 The length of the capitulum from tip of palpi to postero-lateral angles is 

 747 m. The stigmal plates are transversely oval and measure about 233m 



x 1S7 m. 



Mr. Banks' collection contains two partially engorged females collected 

 by Prof. J. M. Aldrich at Brookings, South Dakota, which agree very 

 closely with the type. In these two specimens the maximum widths of 

 the Oasis capituli are 420m and 439 m and the widths between the centers 

 of the postero-lateral angles 327 m and 355 m respectively. In one of these 

 specimens the stigmal plate measure 201 m x 233 m. The scutum of each 

 is finely punctate and the lateral carinae strong and incurved at tips. 

 But one of the specimens shows the depression between the porose areas. 

 On account of the fact that many specimens of cookei have a more or less 

 distinct scar between the porose areas, this character is of limited syste- 

 matic value. 



The collection of the Bureau of Entomology at Dallas, Texas, contains 

 1 9 from Citellus columbianus, Bozeman, Montana, March 20, 1910 

 (Prof. R. A. Cooley); 1 $,4 nymphs and 5 larvae from wild cat, AVichita 

 Mts., Oklahoma, December 21, 100'.) (Frank Rush); 1 9 from striped 

 ground squirrel, Luther, Wyoming, September 24, 1910 (C. 0. Lyon); 

 1 9 from rock squirrel {Citellus variegatus couchi Baird) Devils River, 

 Texas, May 4, 1007 (F. C. Bishopp). 



The specimen from Montana agrees with the type very well, but the 

 lateral carinae are not strong and are but little incurved at their tips. 

 The greatest width of the basis capituli is 445 m; the width between centers 

 of postero-lateral angles is 337 m. Stigmal plates have about 36 goblets 

 each and measure 201 m x 144 m. The female from Oklahoma has the 

 capitulum pulled off, hence the determination is doubtful. The scutum 

 and legs agree closely with the type. However, the stigmal plates are 

 larger (373 m x 316 m and 395 mx 316 m) and have many more goblets. 

 The specimen from Wyoming is typical of the species, although the basal 

 spine on coxae I is slightly shorter than the type. The greatest width of 

 the basis capituli is 457 m and the width between the centers of the 

 postero-lateral angles 373 m- The stigmal plates are very small, measuring 

 177 MX 168 m- The female from Texas is from the same lot which Mr. 

 Banks examined and placed under /. sculptus in his Revision. This 



