73

THREE NEW MAMMALS FROM SIAM. BY C. BODE:\' KLOSS, F.Z.S. 1. Faguma larvata vagans, subsp. nov. 'l'ype. Skiu of female, No. 2655JOBK. Collt:>cted at Sikawtur, 'W miles N. W. ofRaheng, WestPJ·n Siam, 1500 ft., on Feb. 27th, 1917, by Mr. K. G. GairdiiPI'. Original number 374. Characters. Differs from Pagnma lc~1·vatc~ inlr·udeus vVronghton, from Myitkyina, North Burma,* in having the hair uf t.he upper parts tipped with black instead uf buff', the white stripe not extending bt>yond the 11eck, the pale spot above the eye confl.ul:' nt wi1'11 the patch below the ear, the fore-neck cream, the ventral surface creamy with pale grey bases to the hairs Pxcept on the fore-uPck and poste ri ot· n bel o- men where the fnr i,; n11icolorous, aud the hiud leg;:; t-troug ly tingPd with ochraceous on their inner side:::. Fur of two kinds 011 the upper surfa ce :-a "·oolly under-fur of a dmb colour·, sometime;; tipped with buffy; and longer harsh er · hairs with dmb bases sueceeded. by a black and a buff'y annulatio11 and a black tip. CvlO'tw. A creamy stripe, bt·oadest on t he facP, extpuding from the muzzle to the end of the nape ; a creJ.my spot below the E'J'PS ; from above the eyes a crPamy area exteuding beneath the ears dowu- wards to the fore-neck. Hest of h ead with ears, cheeks, chin and throat blackish browu, • this colour bordering the pale stripe and dying out or; tl1e shoulders . Fore and hind feet blackish brown. Remainder of upper parts and limbs pale smoky grey suffused with buffy, the black annulations very nanow, the black tips most marked along the middle line of the back; rump washed with isabelline and inne t· sides of hind limbs with ochraceous. Thro:t t and postet·ior abdomen creamy to the bases of the hairs ; the rest of the under body paler, t h e hairs with pale grey bases. 'l'ail with proximal half like the rump, becoming blackish brown distally where only the base of the fur is buffy; extreme tip creamy. * Wronghton, .Journ. Bombay N. H. S., XIX, p. 793 (1910}; Rylcy, ibid, XXII, p. 720 (1914).

VOL. Ill, NO. II, 191 8. 74 MR. C. BOOEN KLOSS ON

[Colour of soft parts. Nose, liver brown; feet, black; genital skiu, white. .l'dammne, 2 pair;; only found. Pads of hind-feet, 33 mm. in width. K. G. G.]. Measm·emenis. Head and bocly, 610; tail, 575; hinclfoot, 74; ear, 50 mm. Of t h ~ skull I am unable to g iv e any details as it was cal'l'ieLl off by so me animal while drying: it probably possessed no characters that wou ld differentiate it from neighbouring races. Remarks. A nim::t ls from S,onth Tenasserim and Bandqn, Penin- sular Siam , connect thi~ race with 1·olntsta l\liller, from Trang "'; they are not so cl ull as vagans but less fu h·ous and buffy than the other, and t.he nape stripE' is faintly indicated: th<>y do not appear distinct enough, howeve t·, to just,ify the bestowal of a name. 2. Rattus griseiventer rabengis, subsp. uoY. 'J 'ypes. Male vix ad. and female a·!. from Me Taw, 4.0 miles ,N. W. of Haheng, W. Siam, 1500 ft [Nos. 2637, l:) in being more woolly (less spiny) and much darker above; hands am1 feet white throughout, not largely brown. Mamm::e 3 - 3= 12. Colo·ur. Above dark brown g rizzled with ochmceous tawny, sides and limbs g rey ish brown; uncler-parts neutral grey washed with creamy in the male, with pal<:~ buff' in the female. Tail dark through- out : ten rings to the cent im etre at the middlt>. Sf,"ttll c&ntl tee th. Co mpared with that of n. g. tj?·iseiventm·, the skull has the 11 asals nntch longer, pointed posteri orl y and extending • backwards well beyond a lin e joining the front borders of the orbital spaces; bullae small er, less dilated a ncl narrower: the teeth larger. The palatal fommina Pxtend about .5 mm. behind a li.n e joining the roots of the molars, the t ooth rO\\'S diverge posteriorly and the front edge of the anteorbi tal plate js con vex and overhangs t he base (considerably in the femal e). Remadcs. I have refel'l'ecl these a nimals to B. gn'seiventm· ( 13ouhot.e) bnt it should not necessarily be i nfen ell t.hat I regard the latter as the true ::;u pet'fo rm oft he spet.:ies t.o which both belong : they ;; Panulo.,; w·u8 robudus l\1 ill er, Proc. Diu!. Su0. ·w asltington, xix, p. 2G (190G).

JOURN. NA'l'. HIST. SOC. SIAM. THREE NEW MAMMALS FROM SIAM. 75

seem, h or~·ever, relaten to it, and it is the earliest., nndoubte(lly allied race, I ;1111 able to compare them with for the moment. Pot· compariEon, the dimensions of the type of R. ?'ubricogc~ ( Anderson, 7,ool. Res. Yunnan, p. 306) from the country between Bhamo and i\fomein, are g iven: thongh also a grey-belli ed rat, it will be seen th~t it is a far smallPr animal; tlte skull of R. g. mhengis is heavy with strong ridges \\'hereas the othet·'s looks more like that of a gigantic R. concolo?·.

Measurements of Rats in millimetres.

Head and body 190 208 205 1 140 Tail ... 174 194 190 130 Hindfoot, s. u. 34 37 35 32 Ear 19.5 21 20.5 \ Skull:- greatest length ...... 44.3 45.2 45 37.5 condylo-basilar length .. . 38 39.8 39 32.1 palatilar length .. . 22 20.8 17.5 rliastema ...... 12 12.5 12.4 10 upper molar row (alveoli) 7 I .7.9 6.8 6.8 combined palatal foramina ... 8.'1 X 2.8 8.9 X 2.8 8.6 X 3 7.3 X 2.2 • m3-m3 (alveoli) ... 5.1 5.3 5 4.1 nasals ... • .. 18 X 5 18.5 X 5 16 X 5 14.8 X 4 interorbital breadth ... 6 6 6.7 5.4 brain case breadth 17 17 16.5 15.7 zygomatic breadth 20.8 20.1 20.1 ] 7.2

3. Rattus rajah siarma, subsp. nov. Rattus stmfer, Gylden!it.olpe (partim), Knngl. Sv. Vet. Akacl. Hand!., 5i, No. 2, p. 42 (1917) [Koon Tan, N. Siam]. Type. Adult male (skin and skull) from Rilmwtur, 40 miles . ------"':\Iale wi th Yery wot·n teeth from Plentong R iv t)r, S ..Tohore, Malny PPn insnla, No. :!539-08. F. l\f. S. Mns. t 'l'Peth considernbly nt ore worn than No. 2637, sli ghtly more wom than No. 2368.

VOL. III, NO . II, 1918. 76 MR. C. BODEN KLOSS ON

N. W. of Rn.heng, W. Siam, 1500, ft. [No. 2632/ CBK.J. Coll ected by Mr. K. G. Gairdner orr 13 March Hll7. Orig. Nu. 399. 1 D£aunosis. SI ightly darker than R. 1·o}ah .finis ' from S. E. Siam and with shortet· nasals: these are more truncatE' posteriorly and a! ways, apparantly, fall decidedly short of a line joining the front extremities of the orbital spar.es; in .finis t.he nasals are nearly alway11 protracted backwards ·beyond such a line, and the ends are more- rounded or pointed: in the present race the posterior ends of the premaxillaries are also less oblique. This form is duller above than .R. ntjah SU1''fer (Miller) of Peninsular Siam. Speci11Mns emaminecl. Six from the type locality aud Me Taw, 1500 ft., closely adjacent [ Orig. Nos. 36'1·, 376, 398, 4.05. ], and another fl'Om the Pa Wa Gorge, N. Siam [ Orig. No. 228 ], all collectfld 'by Mr. Gairdner·.

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* Epimy.ssnl'ljerfinis, Kloss, P. Z. S. 1916, pp. 51, 7;~.

JOURN. NAT, HIST. SOC. SIAr>f. •

Measurements of Rattus rajah sw1na. < 0 :t-< ...... SKULL · ~~ I ..., ;: "Cl 0 ..., ~ 9::;" cS ~ 0 UJ 6 '"' Locality :'! 2 ~- UJ -:;I No. I Rema~·ks 0 "' ~..:. ~~.a ...... 0 .E.a "' ~ -=~ -~ '0""1""' "Cl>, -o~ ~.., "'~ C'.l tJJ- ~ ~-5_ Oil UJ"' ~ ...... 1-< "' . ;.. .,M ~~~ 0.~ > §>o:c a ...... :S rn ~ = ~~ ~ "' ~~9 ~ r:::l CS .§ 8]~ p.,~ i=i 6~~ H c.~ :z;"' .... m"' ~2 " ..... '" N E..CI -1 CO I :I: ;:IJ ~00 1 1 1 1 1 1 ITI 1 I I I I I I I I ITI z ITI ~ 3:,.. 3: 3:,.. Sikawtur and Me Taw, \ r 23.5 4:).5 19 12.9 JG.6 x 4.8 20 2G29 Adult. UJ W. Siam ... 0 2041 JO ... ll .G 6 I 1981 ., ''' I 0 150 173 38 21.5 41.3 34.5 17.1 11 6.5 5.9 15 X 4.5 19 26;)0 ;:IJ " " 0 ...... 44.8 37 18 12.2 G.2 6.1 16.5 X -lA 20 2631 3: ~ " UJ '" I 0 177 186 40 22 H .5 36 .5 18 12 6.3 5.9 J:3.1lx 4.2 19 2632 , •rype. )loo " 3: , ~ 171 161 34 22.5 42 35.2 17.7 ll.ii 6,6 6 !5.1 X 4.) 19.1 2633 " " . ... ~ ...... 11 .3 6.4 6.3 !6.1x4.2 .. . 12634

Pa Wa. Gorge, N. Siam ... I ~ 171 168 37 I ~·~ ~ ~ -. 71 ... 17 11.3 6.2 5.3 15.1 X 4.6 20 2.506

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