EINAR LÖNNBERG, SOME SOUTH AMERICAN CANID^. 3 



the specimen of the first column is a male, because it is 

 somewhat larger than the others, and its sagittal crest is 

 most strongly developed. 



With regard to their general appearance the skulls of 

 lycoides and magellanicus are in spite of the difference in size 

 very similar inter se, the latter being only about 80 % of the 

 former. They have the same elongated and comparatively 

 slender shape with long fox-Iike canines and so on. In order 

 to ascertain whether this resemblance in appearance really 

 was founded on a general agreement in proportions I have 

 made a calculation of the relation of the different dimensions 

 to a certain standard measurement of the respective skulls. 

 As such a standard I have taken the distance between the 

 sphenoid suture and the gnathion, partly because by this also 

 Mivart's measurements could be used for comparison, and 

 partly because the occipital region of the magellanicus- 

 skulls of this museum are a little mutilated so as to exclude 

 exact measurements of this region. The result of this com- 

 parison is to be found on the second table in which the 

 different cranial dimensions are expressed in percentages of 

 the resp. standard measurement quoted above. 



A look at the table is sufficient to prove a general 

 agreement between these percentages of the two species. 

 The zygomatic width is as always a somewhat variable 

 measurement, but it varies practically between the same 

 limits in both species. The same is the case with the length 

 of the nasals. 



Measurements in % of the distance 



between the sphenoid suture and the 



gnathion 



Zygomatic width 



Distance from orbit to gnathion 



Length of nasals 



Interorbital breadth 



