406 
Messrs Nuttall and Warburton, 
small bluntly triangular points; anus about midway between shields. 
Capitulum (Fig. 22) : base rather long, lateral angles somewhat 
anterior ; palps as long as hypostome, article 1 visible and giving 
palp a strangulated appearance (as in R. bursa ) ; articles 2 and 3 
each bear five or six flattened hairs on internal ventral margin ; 
hypostome : corona finely toothed, dentition 3|3, eight teeth per 
file. Legs rather long and slender ; coxa I two-spurred, the inner 
spur much stronger ; very slight rounded spurs at the postero- 
lateral angles of coxae II — IV ; tarsi (Fig. 23) bluntly tapering 
with two small consecutive spurs. 
Female, largest specimen L. 11 '6, W. 8‘9 mm. (smallest, 
slightly fed, L. 3*6 mm.) somewhat square when full fed. Scutum 
(Fig. 26 ; see Note) short oval, nearly circular, glossy, uniformly 
punctate; cervical grooves as in £ with somewhat longer posterior 
depressions; no lateral grooves; foveolae the same size as in </. 
Capitulum : lateral points more pronounced than in ; porose 
areas oval, medium-sized; palps, digit, spiracles (Fig. 25) and legs 
approximating to those of </ . 
Fig. 25. Spiracles of & and ? Fig. 26. ? capitulum and scutum, 
respectively 750 p and 470 p l. 
Origin. Description based on 31 aud 21 $ from Bos caffer, 
Kansanshi, N.W. Rhodesia, collected by Dr A. Yale Massey, 1907 
(preserved in spirit). 
Note . — The greater or less prominence of the caudal protrusion 
depends upon the state of repletion. In unfed specimens the body 
projects but slightly beyond the scutum and conforms with its contour, 
there being no protrusion, whilst in large gorged specimens the protrusion 
may measure '5 mm. Capitulum of $ '1 to -8 mm. 1. Scutum of $ 1'4 
to l - 7 l., 13 to 1‘8 mm. w,, in some specimens more elongated. Digit of 
d (Fig. 24 A) 140 p l., external article bidentate, dorsal process small with two 
blunt processes pointing outward. Digit of § (Fig- 24 B) 120 p l., more 
compact than in d, dorsal process small and irregular, external article 
bidentate. 
The recently described species Rhipicephalus aurantiacus Neumann, 1907, 
appeared to agree so closely with ours that it was necessary for us to refer our 
specimens to Prof. Neumann for comparison with the types of his species. 
He has kindly sent us the following notes with regard to the specific 
differences he has found : — 
