1933 ] 
Giant Ticks of Malayan Rhinoceroses 
141 
species for which he uses the name A. infestum (because it 
comes before testudinarium on the same page of Koch’s pa- 
per). Although I have seen no ticks agreeing with Robin- 
son’s descriptions and figures, I am inclined to believe that 
Schulze was correct in introducing A. fallax as a new spe- 
cies. At any rate, the male off Sumatran Rhinoceros ven- 
trally lacks the small muscular scutes shown in Robinson’s 
figure, while the peltse run parallel with the festoons (in 
Robinson’s figure they are oblique, slightly salient at the 
postero-internal angles. In the three females, the inner 
margin of the scapulae is yellowish (not brown, as in Robin- 
son’s figure) ; and the median anterior area of the scutum 
is almost wholly yellowish (not dark, as in Robinson’s fig- 
ure), although I am not able to see that the yellow color 
forms two longitudinal stripes. 
I am, however, by no means convinced that infestum , 
proper, and testudinarium are racially distinct. Obviously, 
Schulze’s material was insufficient to show that they are 
geographically segregated. Of infestum , proper, he saw 
only Koch’s types from Bintang Island near Singapore, one 
of the Rhio Archipelago, not 75 miles off the Northeast 
coast of Sumatra. Of testudinarium , he saw, in addition 
to Koch’s type from “Java,” 4 males and 4 females from 
Soekaranda, Sumatra. 
The male of infestum , proper, is said to be smaller 
(length, including palpi, 6 mm.; width, 5 mm.), with much 
white enamel among the coarse punctures of the alloscu- 
tum. That of testudinarium would be larger (8 by 6 mm.), 
with reduced enamel among the coarse punctures. The sin- 
gle male from Selangor measures 7 mm. (with the palps) 
by 4.8 mm., and the enamel is quite extensive. According 
to Schulze, in the female of infestum , proper, the scutum 
measures 3 by 5 mm. and has the scapular stripe well-de- 
fined, dark brown. In that of testudinarium the scutum is 
larger (4 by 5 mm.), with the scapular stripe obsolete, pale 
brown. In all three females from Selangor the scutum 
measures 3 by 4.5 mm. ; but the scapular stripes (on the 
anterior margin, between the scapulas and the eyes) are 
dark brown and sharp in two specimens, very faint and 
pale in the third. While the Selangor specimens are un- 
