tion of the caudal vertebrse of M. rhesus is greater than has been generally
supposed.
The skulls of these two monkeys so resemble each other in age and general
dimensions that there can be no question as to their specific identity, and, moreover,
they do not present a single anatomical feature by which they can be separated from
M. rhesus, and in support of the latter statement I figure the . skull of « (figs. 3 and
A) and append the measurements of both. I t will also be observed that this skull
F ig . 3.—Lateral aspect of the cranium of the variety of M . rhesus, Desm., found in Yunnan. % nat. size.
Fig. 4.—Upper aspect of the cranium of the variety of M . rhesus, Desm., found in Yunnan. £ nat. size.
is extremely closely allied to the female skull of M. tcheliensis ( = M. lasiotis, Gray)
as figured by A. M.-Edwards in his able work on the Mammals of China and Tibet,
and from which it is chiefly distinguished by the depression of the frontal region and
its greater contraction in the temporal fossa and by the lesser rotundity of the
parietals. Moreover, although it appears to be of the same age as M. tcheliensis, the
last tooth having not pierced the jaw in either, itis an appreciably smaller skull.
SxUI.Ii MEASUREMENTS.
Anterior hack of occipital to tip of premaxillaries .
Greatest length of occipital to premaxillaries .
Occipital ridge to nasal process of frontal .
Anterior margin of auditory opening to tip of premaxillaries .
Breadth between auditory openings (callipers)
Greatest hreadth behind roots of zygoma (callipers)
„ facial breadth across fronto-malar sutures.
Anterior margin of occipital foramen to maxalliDe of palate
End of premaxilla to nasal process of frontal
Breadth in temporal fossa behind tempero-malar suture (callipe
. „ across zygoma . . .
Breadth of muzzle at base of last tooth .
„ ■ „ first bicuspid
Height of orbit . . . ,. .
Diameter o f orbit . . . . .
Length of lower jaw in line w ith alveolar border
M. rhesus $ M. rhesus
■ p . .
Inches. Inches.
263 2-75
3-94 4-00
3 2 5 3-28
2 65 2-63
2 1 5 2-34
2-30 2-50
2-28 2-28
1‘20 1-28
1-57 1-57
. 1-82 1-68
2-70 2-80
1-20 1-28
1*12 1-17
•81 •71
■90 •90
2-45 2-60
Measurements ox skeletons. M. rhesus $ M. rhesus $
"
Inches. Inches.
Length of cervical vertebr® . 2-20 2-20
,, dorsal ,, . , 4-93 5-50
„ lumbar „ 4-67 4-76’
„ sacral ■* „ . . 1-90 1-62
„ caudal it 9-20 10-90
humerus - 513 4-87
„ radius 5T1 4-96
ulna 5:97 5-73
femur • • 6 0 2 5-93
tibia . . 5‘53 • 5-32
,, man us 3-83 . 3-81
„ pes . 5-56 5-50
„ os inn oma tum 6 07. 5-05
Antero-posterior diameter of pelvis 2-42 2-42
Transverse „ ■ >■ 1-85 T85
Oblique ,, .
Symphysis pubis to spine of ischium
2-15 2-22
» ......................................................................
■ ■ 2-06 .
Greatest breadth of os innomatum, ante 1-22 1-23
Neither M. rhesus nor M. assamemis were included in Blyth’s posthumous
Catalogue of the Mammals of Burma,1 because it was not until the expedition of 1875
th a t I received the first from the valley of the Irawady on the authority of Dr.
Marfels, the Conservator of Eorests to the King of Burma, and it was only on
the same occasion that I procured an example of the last from the second defile
of' the Irawady below Bhamd.
A monkey thus in no way separable from the Indian M. rhesus would appear to
stretch across Burma to the hills defining the left bank of the valley of the Irawady,
and to be associated in the same region with the next species, the distribution of
which, however, would appear to be more restricted to the northern portion of
the valley.
With regard to M. oinops, a careful consideration of the characters assigned
to it by Hodgson does not reveal a single feature by which it may be' separated
1 Journ. As. Soo. Bengal, vol. xliv. 1875.