5 2 Bulletin American Museum of Natural History. [Vol. XX, 



Measurements. Total length (type, ?), 1080; head and body, 

 540; tail vertebrae, 540; hind foot, 116; ear, 40. Skull, occipito-nasal 

 length, 122; basal length of Hensel, 108; zygomatic breadth, 60; 

 interorbital breadth, 25; width of braincase, 44.5; length of upper 

 molar series, 21; audital bulla, 13 x 9.5. Another female (No. 10125, 

 Bangs Coll.), from Boquete, is slightly smaller.. Both are middle-aged 

 adults, with undeveloped crests, and the sutures of the rostral portion 

 of the skull still well-defined. Another specimen (No. 10123, Bangs 

 Coll.), sex not indicated, but apparently a male, very old, with closed 

 sutures and well developed sagittal and occipital crests, is rather larger 

 than the type, the occipito-nasal length being 130; the basal length, 

 112; the zygomatic breadth, 77; the audital bulla, 13 x 9.5; sagittal 

 crest, 6. 



N. narica panamensis probably differs very little in average 

 coloration from N. n. bullata, both forms presenting the usual 

 wide individual range of color- variation seen in all the forms 

 of Nasua, but it is apparently very much smaller, with the 

 audital bullae nearly one half less. From N. narica it differs 

 markedly through its much darker general coloration, and 

 still more so in this respect from the forms of the more arid 

 portions of Mexico. 



Nasua narica yucatanica, subsp. nov. 



Type, No. lff, $ ad., Chichenitza, Yucatan, March 1 1, 1896; Frank 

 M. Chapman. 



General color above, including the tail, pale brownish yellow; hairs 

 of the upper surface, individually, ochraceous buff, with the tips 

 slightly brownish over the hinder portion of the dorsal region, and 

 yellowish white on the shoulders; sides of shoulders, sides of neck, 

 and proximal two-thirds of fore limbs pale cream color, the light tips 

 of the hairs very long; ventral surface pale reddish brown, with the 

 tips of the hairs whitish; the dark areas on the face and the fore and 

 hind feet dark chocolate brown; tail all around pale buff, darker and 

 slightly browner at the tip. 



Measurements. Total length, 1150; tail vertebras, 550; hind 

 foot, 100. Skull (very old male), occipito-nasal length, 130; basal 

 length (inner base of incisors to posterior border of condyles), 120; 

 zygomatic breadth, 77; interorbital breadth, 29; width of braincase, 

 43; length of upper molar series, 18; length of lower molar series, 

 23.3; height of sagittal crest, 6.5; audital bulla, 14.6 x 10. 



Nasua narica yucatanica is a small, pale form, from the arid 

 districts of Yucatan. While it considerably exceeds in size the 



