308 
The Genus Ixodes 
slightly posteriorly to the spiracles; colour a dark chestnut brown; a 
broad protruding marginal fold in which the scutum appears sunk and 
overlapped. Scutum: 3-65 x 1-7 mm., with extraordinarily developed 
pseudo-scutum, bearing sharply defined protruding outer ridges convex 
externally; cervical grooves diverging and attaining the posterior 
margin of the pseudo-scutum where the median field protrudes: the 
pseudo-scutum somewhat rugose with moderate uniform punctations 
chiefly in the median field; the rest of the scutum smooth, convex, 
with a few fine punctations and hairs. Capitulum: small, 0-52 mm. 
long dorsally, base coarsely punctate, with short straight dorsal ridge 
Fig. 10. Ixodes nuttalli LahiEe 1913. d (N. 2517). Dorsum, venter, capitulum in dorsal 
and ventral aspects, spiracle and tarsus 4 (G.H.F.N. del.). 
continuous with the sides which diverge forwardly. Palps short and 
bulbous, article 1 small and inconspicuous, articles 2 and 3 clearly 
defined, 3 somewhat shorter than 2, both with many fine hairs; ( Ventral 
aspect ) base with slightly concave ventral ridge, sides diverging, almost 
straight; hypostome nearly as long as the palps, with inconspicuous 
teeth, 3|3, 5-6 teeth per outer file, emarginate distally. Venter: sexual 
orifice facing the second intercoxal spaces; pregenital plate small, 
broader than long; median plate much longer than broad, hexagonal; 
adanal, epimeral and anal plates very long; all plates finely punctate; 
spiracles ovoid, the long axis and blunter end pointing forward. Legs: 
Coxa I with short internal spur, and two postero-external spurs one 
