LÖNNBERG, MAMMALS FROM ECUADOR AND RELATED FORMS. 21 



specimen from San Lorenzo, Rio Grande do Sul (n:o 88. 11. 

 30. 17), which appears to differ from the rest by its very 

 heavily built skull. It is an old male, but as it is only repre- 

 sented by the skull I will confine myself to give the measure- 

 ments of the same: 



Greatest length of skull including occipital crest . . 127,5 mm 



Occipito-nasal length (without crest) 118,5 



Zygomatic breadth 79 



Least interorbital width 28 



Breadth across postorbital processes 36,8 



Least postorbital breadth 23 



Breadth of brain-case 49,5 



Greatest mastoid breadth 57 



Length of palate 63,8 



Length of upper molar series 23,2 



Length of upper carnassial 11(11,5) 



Breadth of upper carnassial across heal 8,5 



Transverse length of m 1 9,3 » 



The sagittal and occipital crests are strong, and the z}<go- 

 matic arches are heavy. measuring at their middle 8 mm in 

 vertical height. It is possible hat the Tayra of Rio Grande 

 do Sul forms a distinct subspecies. 



Mustela affinis Gray. 



Two specimens from Zambiza, altitude 8,000 feet. One 

 of these has a narrow white band running from the posterior 

 corner of the eye backwards, and then downwards to the white 

 of the throat. The other has only a trace of this mark on one 

 side. Both are dark brown above, blackish on the head and 

 the tip of the tail, chin and throat white, lower parts otherwise 

 orange rufous. 



Native name: »Chucurri». 



i Mustela macrura Taczanowski. 



Although quite a number of names have been given to 

 South American Weasels it appears to be a great uncertainty 



