98 
- Annals of the Teansvaal Museum. 
and lias fifteen to sixteen teeth ; palpi long, rather slender, second 
article longer than the third. Legs slender, brick red; coxae I, ll, 
and III flat, unarmed, with posterior margin sharp; coxae IV more- 
swollen, with a small tubercle on the external third of the posterior 
margin ; tarsi elongate, slender. 
Habitat. — Cape Colony. 
Hosts. — Sheep. 
I have seen no specimens of this tick. The description is taken 
from that of Professor Neumann. It is supposed to transmit a disease 
of sheep (Neumann). 
GENUS HYALOMMA, KOCH. 
A cams (ex. p.), Linnaeus (1758). 
Ixodes (ex. p.), Latreille (1796). 
Cynorhaestes (ex. p.), Hermann (1804). 
Hyalomma, Koch (1844). 
Hyalbmma, Kocli (Neumann, 1899). 
Eyes present, sometimes hemispherical, shining, in a sub- 
marginal pit of the shield, sometimes flat and scarcely salient. 
Kostrum long, with palpi valvate. Anal groove in a semi-circle, 
opening in front, joining the sexual grooves, and followed by a 
median ano-marginal groove. Body in an elongate oval. Colour 
brown, more or less intense. Male with ventral face provided with 
two pairs of plates ; two anal plates, triangular, large, and two 
accessory plates, very small, narrow; often two accessory plates, 
behind the anal plates; stigmatic plates comma-shaped with a 
long tail. Dorsal shield festooned on its posterior margin. Tarsi 
spurred. Female with stigmatic plates triangular; posterior margin 
of body festooned before repletion. 
Koch made the distinction between this genus and Amblyomma 
depend on the eyes, hemispherical in Hyalomma and flat in. 
Amblyomma. Neumann found that there were a great many inter- 
mediate stages between these two types of eyes, but that the presence 
of anal plates in the male of Hyalomma was an essential character. 
The females of Hyalommia, so far as known, he found distinct from 
Amblyomma by their orbited eyes and oval shields, instead of 
triangular or cordiform shields ; also the eyes near the midde of shield 
instead of near the anterior third or fourth, as in Amblyomma. This 
genus has only a few species, two of which occur in South Africa, 
H . aegyptium with its variety impressum and H . hippopotamense. 
The variety impressum seems to be more abundant than: 
H. aegyptium in the Transvaal. 
Males. 
A. Dorsal shield shagreened ... ... aegyptium impressum ... 
A A. Dorsal shield with punctuations unequal but distinct. 
£}. Eyes prominent, black, spherical; punctuations of shield: 
numerous, unequal, coxae I deeply divided 
aegyptium.. 
