322 



Measurements of eight skulls of FELLS CONCOLOR. 



FELIS PARDALIS. 



Fourteen skulls of Felis pardalis show a most decided southward in- 

 crease in size. A series of five skulls from the Lower Rio Grande aver- 

 age about an inch shorter than another series of nine from Southern 

 Mexico and Central America. The largest of the Rio Grande skulls has 

 a length of 5.25, while the smallest of the Mexican and Central American 

 series (excluding one rather young specimen) has a length of 5.20, and the 

 largest a length of 6.20. The three largest (6.00 to 6.25) are from Costa 

 Rica, while one other from Panama and another from Surinam are but 

 little smaller. The smallest of the Eio Grande series (a rather young 

 specimen) is but 4.50 in length ; the smallest of the tropical series (a 

 specimen of corresponding age) 5.35. 



The difference in size with locality is thus as great in this species and 

 in Felis concolor as it is in the Wolves and Foxes ; but the increase 

 is in the opposite direction, to the northward in the former and to the 

 southward in the latter ; the one group being a northern type, the other 

 a tropical. 



Measurements of fourteen skulls of FELIS PARDALIS. 



LYNX RUFUS ET LYNX CANADENS1S. 



In the subjoined table are given measurements of thirty -four skulls of 

 North American Lynxes, namely, seven of L.fasciatm, ten of L. rufus, 

 eight of L. maculatus, and nine of L. canadensis, representing localities 

 as distant from each other as Alaska and Northern Mexico on, the one 

 hand, and New York and Fort Tejon, Cal., on the other. Yet the 



