LÖNNBERG, MAMMALS FROM ECUADOR AND RELATED FORMS. 31 



,4 . sierras, an 

 dina o* ad. 



Interorbital width 33,3 mm 



Tip to tip of postorbital processes 45,5 » 



Length of nasals 44 » 



Width of nasals at frontoprsemaxillary suture ... 20 » 



Length of frontals mesially 42 » 



Greatest posterior breadth of skull 50 » 



Length of upper molar series 28 » 



» » lower » » 30 » 



Length of skin (head and body) about 61 cm 



The length of the fur is also, as could be expected, greater 

 in this alpine Paca even than in A. taczanowskii. The hair 

 in the interauricular region measures in the former 35 — 37 

 mm, but in the latter 29 mm; on the middle of the back these 

 measurements are resp. 40 — 45, and 35 mm; on the rump 

 resp. 45 — 50, and 34 mm; on the cheeks 33 — 35, and 29 mm. 

 With such a fur as this the alpine Paca is evidently rather 

 well equipped to enclure the chilly, foggy and stormy climate 

 of its native haunts. 



The alpine Paca displays of course the characteristic 

 pattern of the genus with longitudinal series of whitish spöts. 

 The arrangement of these series is, however, not identical 

 with that in S. taczanowskii according to Stolzmann's descrip- 

 tion. In the alpine Paca several long and short series may 

 be discerned. The uppermost long series begins above the 

 shoulders and extends from there on either side of the dorsal 

 line backwards to the rump containing about ten spöts. On 

 the posterior portion of the back there are, however, two 

 short rows of 4 — 5 smaller spöts between the mentioned long 

 series and the median line. Somewhat behind the middle 

 of the body a quite short series with only 3 — 4 spöts is found 

 across the upper portion of the hams between the uppermost 

 long series and the following lateral long series. The two lower 

 long series begin on either side near each other just behind 

 and just below the ear and extend from there backwards över 

 the flanks and thighs. These series contain approximately 

 about 14 spöts. Still another short series only consisting of 

 about four spöts may be traced from the inguinal region and 

 backwards. The general colour of the back is dark maroon 



