6 
Lynceus, Raf. Pajeros, Lynx et Caracal, Gray. 
- pajeros, Desm. South America. The Pampas. 
- borealis, Gray. Northern Europe, Sweden. 
- canadensis, Geoffr. North America. 
. pardinus, Temm. Southern Europe, Turkey. 
-isabellinus, Blyth. Thibet. 
- rufus, Guldenst. North America. 
- maculatus, Vig. and Horsf. North America, Mexico, and 
California. 
L. caracal, Schreb. Southern Asia and Africa, Persia and . 
Arabia. 
Neofelis, Gray. 
N. macrocelis, Temm. Himalaya (Hodgson), Malacca. 
N. brachyurus (Temm), Siam. Swinhoe, Formosa (Swinhoe). 
A et i ee 
1 
Uncia, Gray, Cope emend. Leo, Tigris et Leopardus, Gray. 
U. concolor, L. North and South America. 
- auratus, Temm. Himalaya, Sumatra, Borneo. 
onca, L. South America, Mexico, Texas. 
. chinensis, Gray. Pekin, mountain forests of the west. 
-japonensis, Gray. Japan. 
pardus, L. Southern Asia, North, . South, and West Africa. 
. tigris, L. Asia. 
-leo, L. Africa, India. 
-irbis. Thibet. 
Cynelurus, Wagler. Gueparda, Gray. 
C. jubatus, L. Africa, Asia, Persia, Cape of Good Hope. 
? C. ferox, Leidy (Aelurodon). Loup River, Nebraska. 
pala seas 
The successive order of the modifications of structure which — 
define the above genera is not difficult to perceive, and it is inter- 
esting to discover that, as in other cases, it coincides with the 
succession in geologic time. The typical genera Uncia, Felts, etc., 
are characterized by great specialization, and it is they which now 
exist. The oldest found Dinictis, Nimravus, etc., are the least 
specialized in most respects, and they disappeared before the close 
of Miocene time. 
Since one of the special characters of the Felidx is the reduc- 
tion in the number of the molar teeth by subtraction from both 
ends of the series, an increased number of these constitutes re- 
a 
