Gr. H. F, Nuttall 
415 
length; accessory plates only slightly chitinized at their rounded tips; 
spiracles elongate comma-shaped. Legs: with coxal showing slightly 
dorsally, bifid, with broad internal and slightly longer and narrow 
external spur; coxae II—IV with short, stout spur at the postero¬ 
external angle and (in some specimens) a small point at the postero¬ 
internal angle of coxa IV; tarsi very short and broad, with two small 
terminal spurs ; claws slightly longer than the pads. 
Fig. 7. RMpicephalus simpsoni ? : capitulum and scutum, ventral aspect of capitulum. 
F. M. H. del. 
Female: resembles the ; unfed, the body varies in size from 
2‘5 X 1‘5 to 3'75 x 2'5 mm., averaging about 3’4 x 2 mm.; marginal 
grooves, festoons, and few hairs present. Scutum longer than broad, 
varies in size from 1'4 x 1’2 to 1‘8 x 1’65 mm., averaging about 
l'7xl‘6mm.; scapulae rounded, deeply emarginate, antero-lateral 
contour but slightly convex back to and including the eye, posterior 
to which the contour is rounded and sinuous with a slight median 
protrusion. Cervical and lateral grooves starting together in a deep 
pointed pit, the cervicals distinct for half the scutum-length, then 
fading in a somewhat fusiform concavity lying between the median 
field and the raised lateral boi’der, which is bounded inteimally by the 
lateral groove, the latter disappears near the posterior border; a few 
scattered punctations, some coarser ones accentuating the lateral 
groove; eyes pale, flat. Capitulum resembles that of the but with 
broader base ; cornua faintly marked ; porose areas small, ovoid, directed 
obliquely forward and inward, the interval equal to twice their width ; 
palps longer than in the f. Venter: vulva facing coxa II; spiracle 
shorter and broader than in the f ; festoons distinct. Legs, etc. 
resembling those of the f, movable articles slenderer. 
