Gr. H. F. Nuttall 
307 
9 and Rhipicephalus liaemaphysaloides (Supino, 1897) $; I am much 
indebted to my friend Mr F. K. Ward, B.A. (Christ’s College, Cambridge), 
who collected these specimens for me on his travels and under great 
difficulties. We have also determined (Berlin 176) 1 $ taken at Genji- 
yarna, Koshii, Japan, 5400-7000 ft., 11-12. vm. 1905, by H. Sauter. 
Type of the <? (N. 2948) in Cambridge. 
Ixodes nuttalli Lahille 1913. 
Figs. 10-13. 
Lit. and Icon.: Lahille, F. (1913), Bol. d. Ministero de Agricultura, Buenos Aires, 
reprint 14 pp., 6 line figures and 3 half tone figures (Laminas 1-3). (The author 
also deals with I. loricatus Neumann, 1899, and refers to other species. Lamina 
3 and figs. 4-6 represent I. nuttalli.) 
Lahille’s figures, obviously drawn from a balsam-mounted specimen, 
illustrate the male, its capitulum in ventral aspect, the spiracle and 
coxae with trochanters, highly magnified. The author gives elaborate 
measurements of which I only cite those of the body: 3-63 x 1-98 mm. 
He notes the resemblance to I. angustus Neumann 1899, and lays stress 
on the differences present in 1. nuttalli : the very pronounced pseudo¬ 
scutum, the form of the ventral plates, the peculiar coxal armature, 
all of which make it a distinct species. 
As Lahille only describes the d, a single specimen at that, and I am 
able to describe all stages (d 9 O Z.) from specimens received from Peru 
and found on a related species of host, I take occasion to redescribe 
the d and figure it afresh in view of certain omissions in Lahille’s 
description which is, however, sufficiently clear, especially with the aid 
of his figures, to render certain the determination of the species. 
I find that the resemblance to I. angustus 1 holds for all stages, the 
nymph and larva of I. nuttalli being equally peculiar in respect to the 
structure of the capitulum. All stages show specific differences when 
compared. 
Male (Fig. 10): ( Dorsal aspect ) Body long oval, 3-9 x 2-3 mm., 
widest in front of the mid-length at coxae IV, with sides narrowing 
1 I take occasion here to correct an error in the description given of the nymph of 
1. angustus in our work Ticks, Part ii. p. 197, Fig. 189, wherein the first palpal articles, pro¬ 
truding outward and backward ventrally, are wrongly described and figured as auriculae; 
the figure should be corrected in the light of the one herein given (Fig. 12) of I. nuttalli, 
the articulation in I. angustus being marked by a line running from the base of the hypo- 
stome outward and backward to the base of the so-called auricula on each side. 
