164 BULLETIN UNITED STATES GEOLOGICAL SURVEY. [Tol.r. 



very long and full, and tlie fulvous under-color of the dorsal surfa.ce 

 shows strongly through the light tips of the long hairs. 



AMazatlan specimen (K'at. Mus., I^o. 9068, T. Bischoff) has the top of 

 the head, back of the neck, and a long, triangular area over the shoulders, 

 deep yellowish-brown or golden, and the whole upper surface is strongly 

 fulvous, through the long hairs being tipped with this color. The white 

 area on the nose is very broad ; the two white eye-spots form a very 

 broad, continuous ring around the eye, which is connected with the white 

 nose-patch by a prominent stripe of the same color. The breadth of the 

 white eye-ring above the eye is 15 mm. The white of the chin, throat, 

 and breast forms a continuous area, and is of unusual purity. In very 

 favorable lights, about four or five indistinct rings can be traced in 

 the basal two-thirds of the tail; but on casual inspection the tail would 

 be pronounced unicolor with the back, except that it has a blackish tip. 

 A Colima (Mexico) specimen (Nat. Mus., Xo. 7228, John Xantus) presents 

 the same general appearance as the Mazatlan specimen, except that the 

 golden on the hind-head, nape, and shoulders has a more restricted area. 

 The white on the nose is also much reduced, and the white about the eye 

 only forms two small, wholly separated spots, the upper of which is con- 

 nected with the white of the nasal region by a narrow, half-obliterated 

 line. A specimen from Pacuare, Costa Eica (Nat. Mus., ISTo. 12878, Jose 

 C. Zeledon), has the face-markings nearly as in the Mazatlan specimen, 

 but the ocular ring is interrupted at the posterior canthus of the eye. 

 The yellow area of the nape and neighboring parts is less well defined 

 than in either of the preceding, ancl has a redder cast. The dorsal sur- 

 face, particularly posteriorly, is much darker, and the light tippiugs of 

 the hairs are silvery on the sides, and rufous or reddish-brown over the 

 shoulders and middle of the back. In other words, the specimen is much 

 darker. The tail has obsolete rings and a dark tip, as in the others. 



A specimen from Central Guatemala (Nat. Mus., No. 8622, Henry 

 Hague), in general features greatly resembles the last, but the brown of 

 the face is darker and the white markings more restricted, the eye-spots 

 being small, widely separated, and wholly cut off' from the white area 

 on the nose. The posterior half of the dorsal surface and the tail are 

 much darker (blackish-brown), but the sides of the body, from the head 

 to the middle of the body, have the long hairs tipped for nearly half 

 their length with silvery white, tinged more or less with yellow. A 

 specimen from Talamanca, Costa Eica (Nat. Mus., Ko. 12197, Jose Zele- 

 don), in much worn pelage, is very dark throughout, and, apparently 

 owing to the wearing-off of the ends of the long hairs, shows none of 

 the usual light tippings. This specimen is the darkest of the series : it 

 shows trace of annulation in the tail. A specimen from Mexico (Is'at. 

 Mus., No. 7230, labelled ^^JSfasua leucorJiyncJms, Tschudi, Mexique, Maison 

 Yerreaux ") is deep blackish-brown throughout, the long hairs slightly 

 tipped with light-yellowish over the shoulders, passing into silvery on 

 the sides of the shoulders. Sides of the neck with a small area of white, 



