Mammals Collected by Dr. W. L. Abbott on the Natuna Islands: Proceedings of the Washington Academy of Sciences, Vol. III, pp. 111-138 — John Stuart Mill — John Shaqi
Mammals Collected by Dr. W. L. Abbott on the Natuna Islands: Proceedings of the Washington Academy of Sciences, Vol. III, pp. 111-138
John Stuart Mill · en
_Measurements._--External measurements of type: total length 235;
head and body 140; tail vertebræ 95; hind foot 35 (33). Average and
extremes of four specimens from the type locality: total length 239.5
(235-247); head and body 140; tail vertebræ 99.5 (95-107); hind foot
35.2 (34-36.5); hind foot without claws 32.9 (31.8-34).
Cranial measurements of type: greatest length 34 (38);[17] basal
length 28.6 (32); basilar length 26 (29); palatal length 14.6 (16);
diastema, 7.6 (8.8); length of nasals 10.4 (11.4); greatest breadth
of nasals 4.8 (5.6); interorbital breadth 12 (12.6); zygomatic
breadth 20.8 (21); greatest breadth of braincase 17 (17.6); cranial
depth from middle of interparietal to lower rim of audital bulla 14
(15); least depth of rostrum 7 (7.2); mandible, 20 (21); maxillary
toothrow (alveoli) 6 (7); mandibular toothrow (alveoli), 6 (7).
_Specimens examined._--Six, all from the type locality.
_Remarks._--This species is immediately distinguishable from its
allies by its small skull, scarcely larger than that of _Funambulus
macclellandi_.
SCIURUS NATUNENSIS (Thomas).
1894. _Sciurus lowi_ THOMAS and HARTERT, Novitates Zoologicæ,
I, p. 659. September, 1894 (Sirhassen).
1895. _Sciurus lowi natunensis_ THOMAS, Novitates Zoologicæ,
II, p. 26. February, 1895 (Revised determination of Sirhassen
specimen).
1895. _? Sciurus lowi natunensis_ THOMAS and HARTERT, Novitates
Zoologicæ, II, p. 491. (Bunguran and Pulo Laut.)
Four specimens from Sirhassen. The average and extreme measurements
are as follows: total length 222 (215-229); head and body 135
(133-140); tail vertebræ 86 (82-89); hind foot 33.6 (33-35); hind
foot without claw 31.5 (30.5-32).
SCIURUS LINGUNGENSIS sp. nov.
1895. _? Sciurus lowi natunensis_ THOMAS and HARTERT, Novitates
Zoologicæ, II, p. 491. (Bunguran and Pulo Laut.)
_Type._--Adult male (skin and skull) No. 104693 U. S. National
Museum. Collected on Pulo Lingung off southern extremity of Bunguran,
North Natuna Islands, June 19, 1900. Original number 494.
_Characters._--Externally similar to _Sciurus natunensis_ (Thomas),
but slightly larger (hind foot with claws 36 instead of 33.6). Skull
larger than that of _S. natunensis_, the audital bullæ much broader
anteriorly.
_Color._--The color is precisely as in _Sciurus natunensis_, and
therefore requires no detailed description.
_Skull._--Skull larger than that of _Sciurus natunensis_ (see
measurements) but not different in general form. The audital bullæ
are, however, readily distinguishable by the much greater development
of the anterior inner lobe. In _Sciurus natunensis_ this lobe is so
small as scarcely to form any part of the general contour of the
bulla. In _S. lingungensis_ it is nearly equal to the anterior outer
lobe, together with which it imparts a distinctly triangular outline
to the ventral aspect of the bulla.