128 GLIRES., 
hairs being finely ringed with bright rufous and tipped with white; nape and 
rump more strongly rufous. Lower parts bright red, orange, or white. 
Many specimens, however, which have the general appearance of awreogaster show 
the rufous subterminal ring of Jewcops on some part of the dorsal surface ; and in others 
we find the red nape and rump-patches gradually appearing. I am therefore compelled 
to return to the view long ago expressed by Isidore Geoffroy *, and to regard them as 
varieties of the same species. ) 
With regard to distribution, most of the examples which I have seen with authen- 
ticated localities are from Mexico; but Mr. Allen mentions one from Guatemala in the 
Washington Museum, and there is one from the same country at Berlin. Specimens 
in the British Museum are labelled as being from Colombia; but there can be little 
doubt that this is an error. S. awreogaster is stated by Prof. Sumichrast (as quoted by 
Mr. Allen) to be “the common species of Sciurus of the tierra caliente of the east coast ” 
of Mexico; and both forms are found in the States of Oaxaca and Tehuantepec. 
In his latest revision of the American Squirrels, Mr. Allen has accepted the above 
identifications, and only differs from me as to the proper name of the species, This 
he still holds to be Frédéric Cuvier’s barbarous title of awreogaster (or, as Mr. Allen 
prefers to write it, aureigaster), rejecting Erxleben’s name of variegatus as being insuf- 
ficiently defined and “admittedly composite” ®. In this I must venture still to differ 
from my much-esteemed fellow-worker. 8. variegatus was founded primarily on the 
Coztiocotequallin * of Hernandez, Buffon’s Coquallin being merely quoted as a synonym ; 
and Erxleben’s diagnosis and description appear to me to be quite characteristic of the 
leucops form of the present speciesf. That some subsequent compilers should have 
confused S. variegatus with S. niger seems to me to be no good reason for abandoning 
the name in favour of such a thoroughly objectionable title as S. awreogaster. 
5. Sciurus hypopyrrhus. (Tab. XII.) 
Sciurus hypopyrrhus, Wagler, Isis, 1831, p. 610 (descr. orig.)*; de Saussure, Rev. et Mag. Zool. 
1861, p.5°*; Allen, Mon. N.-Am. Rodent. p. 746°; Bull. U.S. Geol. Surv. iv. p. 881 4; 
Alston, P. Z. 8. 1878, p. 662°. 
Sciurus nigrescens, Bennett, P. Z.S. 1833, p. 41 (descr. orig.)°. 
Sciurus colliei, Richardson, Zool. Voy. ‘Blossom, p. 8, pl. i. (1839, descr. orig.)". 
Sciurus variegatoides, Ogilby, P. Z. S. 1839, p. 117 (descr. orig.)*, 
Sciurus richardsoni, Gray, Ann. Nat. Hist. x. p- 265 (descr. orig., nec Bachman)’. 
Sciurus boothie, Gray, List Mamm, Brit. Mus. p. 189 (1843, sine descr.) *°; Allen, Mon. N.-Am. 
Rodent. p. 741 4 
Sciurus griseocaudatus, Gray, Zool. Voy. ‘ Sulphur,’ p. 34, pl. viii. (1844, descr. orig.)’*. 
* Several other Squirrels are mentioned by Hernandez; but it is impossible to identify them satisfactorily. 
t “SS. corpore supra nigro, albo et fusco variegato.... . Magnitudo dupla S. vulgaris. Auricule im- 
berbes. Corpus supra nigro, albo et fusco variegatum, ventre flavescente. Cauda supra corpus reflexa”}, 
