200 Bishopp — Some New North American Ixodidse. 



Ixodes banksi n. sp. 



Female. — Capitulum (Fig. 3), length 689m (from tip of hypostome to 

 posterior edge of basis capituli on dorsum); basis capituli narrow, 

 greatest width (452 m) at base of palpi where the basis capituli is some- 

 what extended to form a socket for their reception ; dark yellowish brown, 

 posterior margin almost black, postero-lateral angles scarcely visible; 

 ventrally, basis capituli shows two broad flat processes at the base of each 

 palpus; porose areas rather large, well defined, about as long as broad, 

 extending close to posterior margin, separated by about one-half their 

 length; between them is a narrow groove or depressed line; palpi lighter 

 in color than basis capituli; length 474/;, greatest width 158m; third 

 segment slightly longer than broad; second segment nearly twice as long 

 as third ; first segment rather long and without prominent ventro-lateral 

 process. 



Scutum (Fig. 4), length 1.14 mm., width 1.01 mm., reddish brown, 

 moderately narrowed behind, postero-lateral margins not concave; lateral 

 carinae present but not strong; cervical grooves moderately distinct 

 beginning some distance behind cervical angles, first converging then 

 diverging so as to form an angle at the point where they are nearest 

 together; surface irregularly covered with punctures of different sizes, 

 mostly rather large; also with a few yellow hairs. 



Legs amber in color, long and rather slender; tarsi not abruptly nar- 

 rowed at tips; all coxae (Fig. 5) with a distinct blunt spine at apex; 

 coxae I with a rather long and moderately slender basal spine; coxae II 

 with a trace of a basal spine. 



Stigmal plates (Fig. 6) exceedingly large, slightly broader than long 

 (509 m x 466 m); about 440 goblets per plate, small and very closely 

 crowded together, even near macula, around which there is but a small 

 area without goblets; about 15 rows of goblets between macula and 

 marginal cells at widest point; marginal cells small and close together, 

 only slightly flattened laterally; macula oval, located comparatively close 

 to the antero-ventral border, slightly elevated above area immediately 

 surrounding it, which area is concave. 



Body dark reddish brown, finely striate and minutely punctate, well 

 covered with moderately short, yellow hairs; marginal groove distinct, 

 running from near the lateral angles of shield well around curve of body 

 at posterior end; postero-median groove broad and shallow, extending 

 from near posterior margin half way to posterior end of scutum ; acces- 

 sory grooves deep and broad, curved, slightly longer than the postero- 

 median ; venter with hairs as on dorsum ; anal groove deep ; anal frame 

 slightly pointed in front of anus, sides nearly parallel; entire frame one- 

 fourth as wide as long. 



Type, No. 13,074 U. S. National Museum. 



Type host. — Muskrat (Fiber sibethicus Linn. ). 



Type locality. — Mammoth Springs, Arkansas. 



A female described from a lot of 15 females and 7 nymphs collected 

 June 14, 1910, by Mr. A. H. Howell ( Dallas Accession No. 1833); named 



