1906.] Allen. Mammals from Western- Mexico. 227 



22.4 ( 2I -5- 2 4) : I2 females, total length, 116 (110-123); basal length, 

 103 (94.5-114, only i above 105); zygomatic breadth, 75 (65-81); 

 mastoid breadth, 60.6 (55.5-66); upper molar series, 22.3 (21.3- 



24.5)- 



Adult skulls from New York State, comparable in age with skulls 



from Escuinapa, measure practically the same. In the Escuinapa 

 series none have a well-developed sagittal crest, and only four or 

 five have the teeth decidedly worn. A series from Fort Verde, 

 Arizona (Mearns), are slightly larger, but they are very old, with well- 

 developed sagittal crest and much worn teeth. The difference in 

 size is obviously due to difference in age. 



Specimens in fresh pelage are of course much darker and brighter 

 colored than those in more or less worn pelage, in which the fulvous 

 tints have faded, and the long black-tipped hairs of the dorsal surface 

 have been partly shed or have the tips much worn. Aside from the 

 seasonal difference the series- is quite uniform in coloration. The 

 number of black tail rings is usually six, counting the more or less 

 indistinct basal ones, but excluding the black tip, but quite a num- 

 ber of specimens have seven. 



Available material from eastern Mexico is insufficient to show 

 whether the west coast animal differs appreciably from true P. 

 hernandezii. 



29. Nasua narica molaris Merriam. 



(PLATES XXVII XXX.) 



About 100 specimens, of which about 40 are fully adult, and the 

 rest young, including 6 newly born, the others varying from about 

 one-quarter grown to nearly full-sized young adults. The females 

 predominate over the males, nearly as 2 to i. All were collected at 

 or near Escuinapa, as follows: in December, 20 specimens; in January, 

 19 specimens; in February, 32 specimens; in April, 16 specimens, 

 and others in June, August, and September. The very young speci- 

 mens were taken July 24. 



The surprising feature of the series is the immense range of indi- 

 vidual variation in coloration, the very wide extremes being connected 

 by intermediate examples which fill every stage of intergradation. 

 There is, on the other hand, only about the ordinary amount of 

 individual variation in size and in cranial features. This large 

 amount of material is thus valuable as serving to show what may be 

 expected in the way of color variation in Coatis from the same locality, 



