LÖNNBERG, MAMMALS FROM ECUADOR AND RELATED FORMS. 17 



Lower parts otherwise blackish brown, but a few whitish 

 hairs are seen in the inguinal region. Two more specimens 

 in Brit. Museum n:s 12. 6. 5. 39, and 12. 6. 5. 38 agree essen- 

 tially with the one described above. Their throat-spots 

 are, however, a little more yellowish, and 12. 6. 5. 39 which 

 is a young adult male (with open nasal sutures) has some 

 scattered whitish hairs on the anterior portion of the back. 



Two other specimens in Brit. Museum belong undoubtedly 

 to the same subspecies as well. Both these are, however, a 

 little darker, being in fact almost black on body and tail. 

 One of them n:o 3. 4. 6. 4 from »Rupuni river, S. Brit. Guiana», 

 also presented by F. V. Mc Connell, has also a darker, grizzled 

 head and a small white throat-patch. It is a fine specimen 

 with glossy hair and bushy tail, the hairs of which measure 

 9 — 10 m. It is rather young, the skull with open nasal sutures. 

 The last specimen n:o 10. 5. 4. 6 from Supinaam river, Brit. 

 Guiana, is evidentty an old female. Its throat-spot is also 

 rather small and has a yellowish tint. 



The most characteristic feature in these Tayras from 

 Brit. Guiana is the reversed hair of the whole upper and la- 

 teral portion of the neck. It is true that in some races, like 

 for instance T. b. senex Thomas, the hair of the lateral sur- 

 faces of the neck is more or less reversed, but it is then always 

 a broad median area extending över the upper part of the 

 whole neck in which the hair has the normal direction. 



The following measurements of an old male, and an old 

 female skull complete the description of this interesting race : 



<f 12.6.5.40. 



Greatest length of skull 119 mm 



Occipito-nasal length 104 » 



Zygomatic width 74 » 



Least interorbital width 28 » 



Width across postorbital processes . . 39,8 » 



Least postorbital width 25,5 » 



Breadth of brain-case 47,5 » 



Greatest mastoid breadth 56.5 » 



Length of pålat e 61 » 



Least width of postmolar bony palate 14 » 



Length of upper molar series 2 



Arkiv fur zoologi. Band S. K:o 16. 



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