30 Bishopp — A New Sprcles of Dermacenlor. 



sented rather than to accumulate this information to be used in 

 connection with results of life history studies. 



I desire to thank Mr. W. D. Hunter for the interest he has 

 shown in my work, and to gratefully acknowledge the assistance 

 of Mr. J. F. Strauss, to whom I am indebted for the illustra- 

 tions herewith presented. 



Ixodes diversifossus Neum. 



Prior to the collection of a number of specimens of Ixodes diversifossus 

 by Mr. Vernon Bailey on September 2, 1909, in the Bitter Root Valley, 

 near Hamilton, Montana, but two females of this species were known. 

 The above mentioned collection contained 7 cT, 16 9 and 2 nymphs, one 

 partially and one fully engorged, taken on a cotton-tail rabbit, Sylvi- 

 lagus nuttalli. 



None of the females deposited eggs although some lived for a consider- 

 able length of time. One of the more engorged specimens being alive 

 after seven months. The fully engorged nymph molted to a female 3'.t 

 days after the date of collection. 



The male of this species has not been described heretofore. 



Male. — Capitulum (Figs. 8, 10, 11): length, 402m (from tip of hypos- 

 tome to tips of postero-lateral angles); basis capituli very dark reddish 

 brown, darkest around edges; greatest width (251m) at base of palpi; 

 postero-lateral angles pronounced, rather acute, slightly incurved so that 

 the width between their centers is about 187m: dorsal edge straight; ven- 

 trally basis capituli with an angular tubercle (not a spine as in the female ) 

 below the base of each palpus ; palpi short and rather broad, 294 to 31(5/". 

 in length ; slightly impressed on dorsal side near inner edge ; hypostome 

 short, stout, with four files of teeth, two teeth at base ventrally very large, 

 basal teeth of lateral files also large ; tip of hypostome slightly lobed at 

 apex; chelicerae large, about 1 72m long; external article with five teeth, 

 basal one very stout. 



Scutum 1.31 mm. long by .68 mm. wide to 1.39 mm. long by .65 mm. 

 wide, reddish brown; pseudo-scutum darker and slightly raised; capitu- 

 lar emargination not deep, scapular angles short and blunt; cervical 

 grooves short, rather deep, first converging, then diverging posteriorly 

 and ending abruptly opposite space between coxae II and III; scutum 

 punctate, on pseudo-scutum punctures very small and scattered, punctures 

 large and less scattered behind pseudo-scutum in middle. 



Legs (Figs. 7, 10) fairly long and stout, yellowish brown; all tarsi 

 tapering to tips, tarsi I 351 to 387m in length ; coxae I with a long sharp 

 basal spine, II and III bear a suggestion of basal tubercles, IV with no 

 basal prominence; coxae I with a small apical tubercle, II, III and IV 

 with short, broad apical spines, shortest on IV; long yellowish hairs on 

 all coxae and on legs. 



Stigmal plates nearly circular, about 151m in diameter; goblets of 

 medium size, about five rows at widest and one row at narrowed point 



