13(5 
New Species of Ticks 
with dorsal ridge straight, very slight cornua, sides protruding to form 
rounded angles, base compressed, rounded anteriorly, where the mandibles 
emerge; porose areas small, transversely ovoid or pear-shaped, concave 
like a saucer, the interval about equal to their shortest diameter. Palps 
relatively short; article 3 slightly shorter than 2, both articles 
slightly hollowed on the internal dorsal surface; article 1 small. 
(Ventral aspect.) Hypostome normal, 2 ] 2, with 6-7 stout teeth along 
the outer file. Auriculae forming trenchant rounded protrusions, behind 
which the base grows constricted ; posterior margin of base slightly 
rounded. Venter: Vulva between coxae IY or slightly anterior thereto; 
anal grooves horse-shoe-shaped, distinctly converging behind. Spiracles 
transversely oval; macula slightly excentric or central. Legs : Coxa I 
pointed postero-internally; coxae II-IV flanged, unarmed. Tarsi 
tapering; pad almost as long as the claws. 
Described from 14 slightly engorged $s, found on a bush-cat, at 
Komatendu, Sierra Leone, West Africa, by J. J. Simpson, 13. vnr. 1912. 
(Imperial Bureau of Entomology, No. 604.) 
This species resembles I. lunatus, schillingsi, pilosus and daveyi in 
possessing a horse-shoe-shaped anal groove. These species differ from 
I. oldi, however, in the following main points : 
I. lunatus has armed coxae aud a long capitulum; I. pilosus has 
long palps which are concave externally, and the basis capituli is of 
different shape ; I. schillingsi has no lateral grooves on the scutum, the 
auriculae are sharp and retrograde, coxa I bears two spurs; I. daveyi 
has a long scutum without lateral ridge, long basis capituli and palps, 
coxae armed, etc. 
It is worthy of note that all the known species of Ixodes possessing 
a horse-shoe-shaped anal groove are African : I. lunatus from Mada¬ 
gascar; I. schillingsi from German East Africa; I. pilosus from S. Africa; 
I. daveyi from Uganda ; and I. oldi from Sierra Leone. 
Ixodes rieinoides n. sp. 1 
(Fig. 4.) 
Male : Unknown. 
Female: Hard parts blackish-brown, as in I. ricinus, but the 
scutum may be dark chestnut coloured. ( Dorsal aspect.) Scutum 
with moderately pointed scapular angles, longer than broad, varying 
1 So named because of its general resemblance to I. ricinus. 
