On a new Marmoset from the Lower Amazons. 205 



Jlah. DoornKuipad-hivak (IF. G. van Ileum). 

 Tiipe. Female. B.M. no. 21. 2. 2. 74:. Original niun- 

 ber 12. 



SmintJiopsifi ruJi^eniSf sp. n. 



A greyish species with conspicuously red cheeks, as in tiie 

 much larger aS'. viryinim of Queensland. 



Head and body Ul nun.; tail 102; hind toot 21"3. 

 Sktdl 26-5. 



Hah. Aru Islands. 



Ti/pe. Female in spirit. B.M. no. 22. 2. 2. 76. Original 

 number XX. 



XXXI. — A neio Marmoset from the Lower Amazons. 

 By Oldfield Thojias. 



(Published by permission of the Trustees of the British Museum.) 



An examination of the Museum specimens of Mystax Ursulas 

 shows that those from the west side of the Tocantins Kiver 

 are definably different from those round Parii itself. 

 The new one may be called : — 



Mystax ursnlus umbratus, subsp. n. 



Similar in essential characters to Pard ursulus, but darker 

 throughout, the black shoulder-mantle extending further 

 down the back — to halfway between shoulders and thighs — 

 and the mottled part of the body grizzled tinely with dull 

 ochraceous instead of coarsely with bufFy. 



Dimensions of the type (measured in the flesh) : — 



Head and body 230 mm.; tail '652 ; hind foot 6S ; 

 ear 30. 



Skull : greatest length i8'5 ; basal length 35 ; zygomatic 

 breadth 34. 



Hah. Lower Amazons west of the main Tocautins River ; 

 type from Cameta. 



Type. Old female. B.M. no. 11. 4. 28. 4. Original 

 number 31. Collected 20th January, 1911, by Friiulein 

 Dr. E. Snethlage. Presented by the Ooeldi Museum, Pant. 



Ann. & Mag. N. Hist. Ser. 9. Vol. ix. IS 



