G-. H. F. Nutt ALL 
418 
posterior borders slightly convex, posterior angle' somewhat ogival, 
uniformly coarsely punctate, with some larger punctations along the 
antero-lateral portions. Cervical grooves beginning as two oval pits 
posterior to the anterior border, but soon fading away to a point a little 
beyond half the scutum-length. Colour light in the median field, 
maroon-brown at the sides and along the postero-lateral borders, 
oruamented by an irregularly '^-shaped creamy patch posteriorly with 
its apex directed backward and with two small rounded patches between 
the anterior points of the V and the lateral borders; slight traces of 
ornamentation anteriorly and at the sides. Eyes slightly in front of and 
midway along the scutum-length, elongate oval, colourless, but slightly 
protruding. Gapitidum base roughly triangular, with dorsal ridge 
continuous with protruding lateral ridges (overlapping scutum) which 
in turn are continuous with lateral protrusions on the ventral surface. 
Porose areas deep, pyriform, with the points diverging somewhat 
anteriorly; some scattered punctations on the dorsal surface. Ventrally, 
the base is constricted posterior to the palps. Hypostome 3 | 3, toothed 
over half its length, with slight corona, 10 teeth on the external file, 
fewer on inner files. Palps, viewed dorsally, are broadest at the junction 
of articles 2 and 3; article 2 is two-and-one-half times as long as 
article 3. Venter: vulva facing the second intercoxal space; spiracle 
large, roughly triangular, anal groove, etc. normal (see Fig. 5). Legs: 
coxa I with rounded postero-external spur and small postero-internal 
tuberosity, small tuberosities near the postero-external angles of coxae 
II—IV. The movable joints normal, with whitish annulations at the 
distal ends of the articles. Tarsi tapering obliquely, with two slight 
spurs distally; claws long. 
Described from (N. 1149) 4 $’s found on a sloth {Bradypus 
tridactylus), at Manaos, Brazil, by Mr T. P. Beddoes, 1903. 
Rhipicephalus simpsoni n. sp. 
Figs. 6—7. 
Male : Body and legs reddish-brown; a few very small scattered hairs; 
the soft, pale, yellowish body extending (0'2 mm., or more) beyond the 
scutum and showing a rounded caudal protrusion in gorged specimens. 
Very variable in size. Scutum pear-shaped, broadest at a point three- 
fifths along the body-length (measured from in front) and anterior to 
the spiracles, deeply emarginate, with rounded scapulae ; varies from 
27—2 
