414 
New Species of Ticks 
2'3 X 1'5 to 3'5 X 2'3 to 3'6 x 2‘2 mm. in size; cervical grooves very 
short, only forming two deep oblong depressions, directed inward and 
backward ; lateral grooves indicated by an irregular row of punctations 
ending on a line posterior to the eyes, beginning again, more outwardly, 
posterior to the eyes and merging rapidly into a well-marked groove, 
continued so as to include the second festoon ; a few shallow punctations 
over the back, three longitudinal depressions on the posterior third. 
Fig. 6. Rhipicephalus simpsoni s : dorsum and venter, right palp highly magnified, 
spiracle and tarsus 4. F. M. H. del. 
with more distinct punctations upon the intervening raised areas; 
festoons sharply defined, longer than broad, the median at times 
broader than the others, but usually not so. Capituhim base hexagonal, 
broader than long, narrow behind, with posterior and postero-lateral 
contours concave, antero-lateral margins straight; palps short, constricted 
basally, articles 2 and 3 of about equal length, witli article 3 having a 
slight external angle ; ventrally, article 1 bears an inwardly protruding 
flap, bearing some 6 forwardly curved hairs, article 2 bears 4—5 similar 
hairs along its internal border. Hypostome 3 | 3, with 8 teeth on the 
external file and a corona. Venter: sexual aperture facing coxa II; anus 
midway along the length of the broadly sickle-shaped adanal plates, 
whose incurved points face each other about two-thirds along their 
