1933 ] 
Giant Ticks of Malayan Rhinoceroses 
139 
of unknown origin, the other off Rhinoceros, Africa. The 
Berlin Museum collection contains 2 males and 2 females 
labelled as having been collected by Mosch, in Sumatra. 
It would seem improbable that this tick is to be found in 
two parts of the world so remote as Africa and Sumatra 
without its occurrence being recorded in intermediate parts, 
and the indication of origin of the Berlin specimens is prob- 
ably erroneous.” The present collection from Perak shows, 
on the contrary, that the locality “Sumatra” was correct, 
while there is no reliable evidence of this tick occurring in 
Africa. Neumann’s specimens were most likely obtained 
from animals kept in captivity in Europe. Ticks have fre- 
quently been collected in large numbers in Africa from both 
the White and the Black Rhinoceros ; but, so far as I know, 
A. crenatum was never found among them. 1 
A. crenatum is one of the largest ticks in existence. In 
our series of 24 males, the scutum of the largest measures 
9 mm. in length (not including the capitulum) and 7.8 mm. 
in greatest width, and that of the smallest 5 mm. and 4.8 
mm. respectively. It is noteworthy that the smaller the 
specimen, the more the scutum approaches the perfect 
orbicular shape. The 10 unengorged females are 8 to 9 mm. 
long (without the capitulum) and 7 to 8 mm. wide, the 
scutum proper being about the same size in the largest and 
smallest specimens. Two engorged females are enormous, 
reaching 21 and 22 mm. in length (without the capitulum), 
20 mm. in greatest width, and 16 and 17 mm. in thickness. 
Capitulum and legs also are unusually long. The coloration 
is remarkably uniform in the series seen and agrees well 
with Robinson’s account. The most remarkable feature 
is the absence of metallic spots in the male, while the fe- 
male has three distinct coppery areas, one in each corner 
of the scutum, that of the apical corner the largest. 
The holotypes of A. crenatum ( $ and of A. subluteum 
( $ ) are at the Paris Museum. 
I strongly suspect that Linnaeus based the following 
’I am unable to account for Neumann’s including “Liberia” in the 
range of A. crenatum (1911, Das Tierreich, Lief. 26, p. 78), since there 
is no Rhinoceros in that country and he does not mention it in his ear- 
lier papers. 
