325 



Mcmurenienis of tliirty-four skulls o/Lynx kukus el cars. 





Locality. 



g 

 X 



§ 



^ 

 >§ 



^ 



Remarks. 



8599 



Puget Sound, Wash 





4.80 

 4.65 

 5.20 

 5.45 



3.45 

 3.30 

 3.60 

 3.95 

 3.32 

 3.50 



'3.12" 

 3.82 

 3.38 

 3.55 

 3.22 

 3.27 

 3.32 

 3.50 

 3.38 

 3.37 

 3.37 

 3.72 

 3.51 

 3. 25 

 3.10 

 3.40 

 3.25 

 3.57 

 3.28 

 .3.35 

 3.53 

 3.35 

 3.53 

 3.70 

 3.60 

 3.45 

 3. .'^2 

 3.60 



"faseiatus." 

 Do. 



ti600 



do 





3426 





? 





3197 



do 



Do. 



3427 







Do. 



3426 



do 





4.90 

 4.75 

 5.50 

 5.50 

 4.95 

 5.10 

 4.85 

 4.90 

 4.80 

 4.80 

 4.93 

 4.65 

 4.65 

 5.12 

 5.27 

 4.72 

 4. .55 



Do. 



2032 



Shoalwater Bay, Wash 





Do 



3147 



2883 



Fort Townsenil, Wash ^ 



Big Sioux River 



..„.. 



Do. Very old. 

 "rufus." Very old. 

 Do 



3775 



Mississippi 



7465 







Do. 



3120 



Florida 





Do. Quite young. 



2391 







3574 



Fort Tejon, Cal 



d 



Do 



3342 



do 



Do 



3541 



do 



d ■ 



Do 



3570 



do 



Do. 



3576 



do ^. . 





Do. 



1887 



Fort Belkuap, Tex 







1109 







Do. 



7493 







Do. 



1376 









1367 



do 





5.10 

 4.80 

 5.15 

 4.80 

 4.85 

 4.95 

 4.75 

 4.95 

 5.30 

 5.15 

 5.00 

 5.00 

 5.15 





1368 



do 





Do. 



1006 







Do. 



1159 



Prairie Mer Eouge, Louisiana 





Do. 



9478 



Kinai, Alaska 







6031 







Do. 



6030 





? 

 ? 

 d 



Do 



6216 



Peel River 



Do. 



6211 



do 



Do. 



4468 



Fort Simpson 



Do 



4296 



Liard River 





Do. 



3S79 



Red River Settlement 





Do. 



2570 







Do. 











PEOCYON^LOTOR. 



The present species presents another well-marked case of gradual in- 

 crease in size southward. In a series of fifteen skulls from the Atlantic 

 States (New York, Pennsylvania, and Georgia), only a single specimen 

 exceeds 4.38 in length or 3.00 in width, the largest specimen being from 

 Saint Simon's Island, Georgia. Three from Essex County, iS"ew York, 

 average 4.28 ; five from Pennsylvania average 4.29 ; seven from Saint 

 Simon's Island, Georgia, average 4.2G (or 4.29, excluding one veiy small 

 one). Six specimens from the interior (Nebraska, Missouri, Indian Ter- 

 ritory, and the Lower Eio Grande) average 4.49, two only falling below 

 4.50, and the largest (Rio Grande) 4.70. Three from California {'■'■hernan- 

 desV^) average 4.63, the largest reaching 4.78, with a width of 3.38. Six 

 from Southern Mexico average 4.58, the largest reaching 4.73 in length, 

 with a width of 3.42. Three from Costa Rica average 4.G9, the largest 

 reaching 4.85. 



In addition to the above, there is a single very aged specimen from 

 Detroit, Mich., which has a length of 4.35, and two others from Alaska 

 (one middle-aged, the other rather young) which measure, respectively, 

 4.25 and 4.05 in length, the latter being the smallest of the whole series, 

 although it contains others equally young. 



Between the three specimens from Essex County, New York, and the 

 three from Costa Rica, specimens of corresponding ages and constitut- 

 ing the two extremes, the average difference is nearly six-tenths (0.57) of 

 an inch, or about one-seventh of the size of the northern examples. 



Besides the difference in size, there is also a considerable range of 

 variation in respect to the general form of tlie skull in the ratio of width 

 to length, in the shape, degree of concavity of the palate, in si^ecimens 



