326 



from the same locality, the ratio of width to length varying from 0S5> 

 to 0.73. 



In addition to the increase in size southward, there is a tendency to 

 an increase in the intensity of the colors in the same direction, with a 

 stronger contrast between the light and dark markings. These differ- 

 ences, taken collectively, have given rise to several nominal species, of 

 which the P. hernandezi of Wagler and P. psora of Gray have become 

 the most prominent. The species normally presents a considerable range 

 of color- variation, tending on the one hand more or less to melanism and 

 on the other to albinism. On these extreme phases of coloration have also 

 been based other nominal species, as the P. obscurus of Wiegmaun and 

 the P. nivea of Gray. All these names have been already placed by 

 Gray, in his later notices of the group, under the head of P. lotor^ but 

 separated as being varietally distinct. It seems doubtful, however, 

 whether even the large southern form, usually called hernandezi^ is 

 really entitled to subspecihc recognition. 



Measurements of ihirty-^ix sTculls of Procyon lotoij. 



■2-3 



8690 

 8t)93 

 1068 

 3723 

 3722 

 3079 

 898 

 6025 

 4817 

 • 575 

 766 

 2443 

 2437 

 2447 

 2450 

 2444 

 2446 

 2202 

 Sfi49 

 3085 

 3325 

 7739 

 13S6 

 1387 

 3224 

 3933 

 13312 

 70.'^1 

 6119 

 6481 

 9706 

 13853 

 13854 

 13300 

 14190 

 14191 



Locality. 



Alaalia 



do 



Detroit, Mich 



Essex County, New York. 

 do 



do 



Pennsylvania 



do 



do 



do 



do 



Saint Simon's Island, Georgia 



, do 



do 



do 



do 



do 



do 



ISTebraslsa 



Fort Cobb, Indian Ter 



Independence, Mo 



Long Point, Tex 



Lower Rio Grande 



do 



San Francisco, Gal 



Sacramento, Cal 



California 



Mirador, Mexico 



Colima, Mexico 



do 



Tehuan tepee, Mexico 



do 



do.... 



Costa Rica 



do.... 



do.... 



4.25 

 4.05 

 4.35 

 4.25 

 4.27 

 4.32 

 4.35 

 4.12 

 4.38 

 4.25 

 4.35 

 4.25 

 4.38 

 4.06 

 4.30 

 4.12 

 4.12 

 4.57 

 4.50 

 4.50 

 4.23 

 4.32 

 4.52 

 4.70 

 4.42 

 4.78 

 4.70 

 4.75 

 4.50 

 4.46 

 4.50 

 4.52 

 4.73 

 4.55 

 4.78 

 4.85 



2.87 

 2.92 



2.87 

 2.70 

 3.00 

 3.00 

 2.51 

 2.64 

 2.88 

 2.93 

 2.62 

 3.03 

 2.65 

 2.87 



2.90 

 3.00 

 3.07 

 3.03 



2.78 

 2.98 

 2.90 

 3.15 



3.38 

 3.12 

 3. 15 

 3.33 

 3.15 

 2.83 



Remarks. 



3.42 

 3.03 

 .3.32 

 3.00 



Middle-aged. 

 Young. 

 Very old. 



Do. 

 Middle-aged. 

 V«}ry old. 



Do. 



Do. 



Do. 



Do. 



Do. 

 Middle-aged. 

 Very old. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 

 Young. 

 Old. 

 Young. 

 Old. 

 Very old J "Iienmndez' 



Do. 

 Very old. 

 Middle-aged. 

 Old. 



Middle-aged. 

 Young. 

 Old. 



Very old. 

 Middle-aged. 

 Old. 



Do. 



PUTORIUS VISOK 



Eighteen skulls from the northern i^arts of the continent, mainly from 

 Alaska, average 2.66 in length and 1.58 in width, the extremes being, 

 length, 3.02 and 2.30 ; width, 1.90 and 1.40. Thirteen skulls from the 

 highlands of Northeastern JS'ew York average 2.40 in length and 

 1.34 in width, the extremes being, length, 2.60 and 2.17. Three skulls 

 from Pennsylvania (undoubtedly males) average 2.49 in length and 1.48 

 in width, in the northern series, the sex of the skull is given by the 

 collector, whence it appears that the twelve males have an average 



