KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 57- S.O 2- 37 



be considered as a subspecies of Sciurus jerrugineus. These two forms are merely diffe- 

 rentiated from each other, the Siamese form having the feet golden red while in the Bur- 

 mese form the feet are alwavs black. Mr. C. Boden Kloss comes to the same conclusions 

 in his tentative notes on the Sciurus finlays&ni Group (Journal Nat. Hist. of Siarn vol. I. 

 No. 4. 1915 p. 225—228). 



Sciurus jerrugineus cinnamomeus seems to be fairly common in the dry forests of 

 Northern Siarn. Both my specimens show a slight tendency of developing a whitish 

 tail-tip. No white specimens were obtained or observed during the whole journey. 



Skull measurements oj a tnale specimen: 



Greatest length = 55,7; condylus to gnathion = 51,2; basicranial length = 48,8; 

 zygomatic width = 31, o; width of brain case = 23,2; least interorbital width = 19,4; 

 breadth between meatus auditiva = 22,3; length of nasals mesially = 16,e; greatest 

 breadth of nasals = 7,3; diastema = 12,o; length of palate to henselion = 22, e; length 

 of upper molar series = 10,8 mm. 



Sciurus bocourti gruti subsp. n. 



<§ Koon Tan, Northern Siarn, 1: ' .-, 1914. — Nose to vent - 230 mm.; tail = 219 mm.; hindtoot = 52 mm. 

 — J 1 Koon Tan 5 /« 1914. Nose to vent = 217 mm.; tail = 155 mm.; hinclfoot = 52 mm. — 2 Koon 



Tan 10 /9 1914. — Nose to vent = 220 mm.: tail = 218 mm.: hindtoot = 52 mm. 2 Bång Hue Pong, 



Northern Siarn, s7 /n 1914. — Nose to vent = 218 mm.: tail = 219 mm.; hinclfoot = 52 mm. — 2 Bång Hue 

 Pong 27 /r> 1914. — Nose to vent = 280 mm.; tail = 225 mm.; hindtoot = 52 mm. — 2 Bång Hue Pong 

 8 /5 1914. — Nose to vent == 214 mm.; tail = 229 mm.; hindtoot = 52 mm. — 2 Bång Hue Pong 8 /ä 1914. — 

 Nose to vent — 212 mm.; tail = 244 mm.: hindfoot = 52 mm. 



A member of the Sciurus finlaysoni Group and the Largest of the hithertho known 

 forms. 



This new race which apparently is a mountain-form, being found only aniong the 

 Koon Tan mountains in Northern Siarn, comes nearest to Sciurus bocourti lylei Wrought. 

 though it is still larger, with a hindfoot measuring 52 mm. against 49 mm. in that spe- 

 cies. The general colouration is also different though like the other members of the same 

 Group of Squirrels. In Sciurus bocourti lylei there is according to Wroughton »a com- 

 plete abscense of either red or brown in the coat above». 



Of the specimens examined six are fairly similar as to the colouration of the pelage. 

 They are all characterized by having the face, erown and a broad longitudinal line on 

 the hindneck of a colour nearest to »Sanfords brown» (Ridgway platc II). Hands and 

 feet grizzled black and orange, the feet somewhat darker. Individual hairs on the back 

 black with one påle yellowish-white ring varying in size. The base of the tail on the upper 

 surface of the same colour as the back for about 50 mm., then whitish for about 35 mm. 

 followed by a narrow blackish band; rest of tail bright maroon with the bases of the hairs 

 black. Underparts rusty red. 



Type: Adult female, collected at Bång Hue Pong on the southern slopes of Loi 

 Koon Tan, on the 8th of May 1914. 



Another specimen shot in September at Koon Tan has the underparts of the same 

 rusty red colour. The back, however, is almost whitish except for an indication of a 



