Bishopp — Some New North American Ixodidse. 205 



It should be stated that the determinations of the immature stages are 

 not absolutely certain owing to the difficulty of positively identifying the 

 immature stage.-- of Ixodes. In a few instances nymphs were bred to 

 adult, and in the other case- I fed reasonably sure of the correctness of 

 the determinations. 



Ixodes angustus var. woodi n. var. 



Female. — Caftitulum (Fig. 13), length 680 p. ( from tip of hypostome to 

 a line drawn between posterolateral angles of basis capituli), basis 

 capituli dark brown, greatest width 416^; postero-lateral angles rather 

 less prominent than in I. angustus proper; the basal border of capitulum 

 slightly concave; porose areas small and not well defined, nearly semi- 

 circular with the flat side along the strong carinae which run toward the 

 rostrum from the posterolateral angles of the basis capituli; length of 

 porose areas along these carinae is distinctly greater than their width; 

 widely separated, the distance between them being nearly equal to their 

 length; ventrally the basis capituli is very long, comparatively narrow, 

 and snu >oth ; distinctly longer and more narrow than in typical i". angustus; 

 palpi similar to angustus, but the anterior portion of the flrst segment is 

 distinctly produced ventrodaterally ; hypostome less pointed at tip than 

 in angustus proper. 



Scutum, length 1.44 mm., width 1.07 mm., very similar to angustus, 

 but rather more coarsely punctured and slightly more narrowed behind. 



Legs as in angustus, but heavier; all tarsi are rather abruptly narrowed 

 near tips; coxae I with a moderately long hasal spine (longer than in 

 /. angustus) and a large blunt apical spine; other coxae witli distinct 

 broad apical spines, smallest on posterior coxae. 



Stigmal plates very small (179 fi x 158/*), transversely oval, about 49 

 goblets per plate, medium sized ; four rows at widest and one row at 

 narrowest point between macula and marginal cells. 



Body with numerous, moderately short, pale hairs; anal frame widest 

 near posterior margin, narrowed anteriorly to a blunt point in front of 

 anus. 



Type, Cat. No. 18,976, U. S. National .Museum. 



Type host. — Bairn's wood rat (Neotoma micropus Baird). 



Type locality. — Sabinal, Texas. 



A female described from a lot containing two females and three nymphs 

 collected May IS, 1910, by Messrs. F. C. Pratt and C. T. Atkinson (Dallas 

 Accession No. 1641 ). 



Named for my associate, Mr. H. P. Wood. 



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

 the following material which I have referred to this variety : 2 nymphs, 

 2 larvae, February 7, 1910; 2 ? May 10, 1910; 2 ? May 20, 1910; 3 

 nymphs May 31, 1910. All collected at Sabinal, Texas, on Neotoma 

 micropus Baird, by Messrs. F. C. Pratt and C. T. Atkinson. 



No males were collected. 



