RACC00N8 OF NORTH AND MIDDLE AMERICA 45 



relatively and often actually larger (especially broader) posterior upper 

 premolar and carnassial. Differing from those of P. I. auspicatus and 

 P. I. incautus mainly in usually broader frontal region and much larger 

 posterior upper premolar and carnassial. 



Measurements: — Type: Total length, 665 mm.; tail vertebrae, 222; 

 liind foot, 105; weight (pounds), 7. Two adult male topotypes, 

 respectively: 642, 655; 214, 200; 100, 98; weight (pounds), 7, 8. Two 

 adult female topotypes: 610, 613; 200, 192; 93, 93; weight (pounds), 

 5, 5.5. Skull: Type: Greatest length, 105.9; condylobasal length, 

 101.8; zygomatic breadth, 64.8; interorbital brea<lth, 22.3; least width 

 of palatal shelf, 13.9; maxillary tooth row (alveoli), 40; upper carnas- 

 sial, crown length, 9, crown width, 9.1. Two adult male topotypes: 

 Greatest length, 101.3, 106.7; condylobasal length, 98, 101.8; zygo- 

 matic breadth, 65.5, 69.5; interorbital breadth, 20.4 23.3; least width 

 of palatal shelf, 14.9, 15; maxillary tooth row, 39.8, 40.5; upper carnas- 

 sial, crown length, 8.9, 8.7, crown width, 9.7, 9.5. Two adult female 

 topotypes: Greatest length, 93.7, 94.7; condylobasal length, 90.1, 

 91.8; zygomatic breadth, 58.3, 60.6; interorbital breadth, 20.5, 20.3; 

 least width of palatal shelf, 14.2, 14.1; maxillary tooth row, 36.4, 38; 

 upper carnassial, crown length, 8, 8.8, crown width, 9.2, 9.1. 



Pemarks. — P. I. marinus is one of the smaller subspecies of raccoons 

 that have developed near the southern end of the peninsula of 

 Florida, not dift'ering much in size from P. I. aiisplcatus and P. I. 

 incautus. It appears to be limited to the great maze of mangrove- 

 covered or -bordered islands, or keys, known as the "Ten Thousand 

 Islands" where raccoons are present in great numbers, and to parts 

 of the adjoining Everglades region. Specimens from Ritta at the 

 southern end of Lake Okeechobee appear to be referable to marinus. 

 Most of the islets mentioned are covered by the sea to a depth of 

 from 3 to 4 feet at each high tide, and are totally devoid of fresh 

 water. As most of these keys have no large trees to afford hollows 

 and no dry land the raccoons must make their homes on top of the 

 mangrove roots where they are forced to retreat by the incoming tide. 

 Specimens from Cape Sable show gradation toward P. I. elucus, which 

 ranges south to the eastern part of Dade County along the eastern 

 side of the peninsula. Although evidently closely related to elucus, 

 wdiich occupies a different, but adjoining habitat, marinus maintains 

 its distinctive characters with remarkable constancy. 



Specimens examined. — Total number, 49, as follows: 



Florida: Cape Sable, 3; Chokoloskee (type locality), 38; Coon Key, Ten 

 Thousand Islands, 1;'^ Flamingo, Monroe County (skulls only), 3; ^^ Ritta, 4 

 (skulls only). 



" Amer. Mus. Nat. Hist. 

 '9 Mus. Comp. Zool. 



