ALLEN ON THE AMERICAN SCIURI. 881 



eventually prove to be a southern race. More specimens, however, are 

 required before they can be united ; and provisionally I therefore accept 

 8. griseoflavus as a distinct species. 77 My own inclination, in view of Mr. 

 Alston's diagnosis of 8. griseoflavus, is to unite them, but I refrain from 

 doing so at present. 



Mr. Alston further remarks : " Mr. Allen considers Gra^s M. griseo- 

 flavus to be specifically identical with his [Allen's] M. leucops ; and the 

 original diagnosis certainly seems to give countenance to such a view. 

 The typical specimens (five in number), however, are very different. 

 . . . " In consequence of my referring Gray's Macroxus griseoflavus 

 to my S. leucops, he quotes the latter as a synonym of S. griseoflavus, 

 Alston, but the specimens I referred to my 8. leucops represent his 

 S. variegatus var. leucops. 



VIII. SCIURUS HYPOPYRRHUS, Wagler. 



f Sciurus variegatus, ERXLEBEN, Syst. Anim. 1777, 421 (in part). 



Sciurus Jiypopyrrhus, WAGLER, Isis, 1831, 610. 



Sciurus nigrescens, BENNETT, Proc. Zool. Soc. Lond. 1833, 41 (melanistic). 



Sciurus collicei, RICHARDSON, Zool. Voy. Blossom, 1839, 8, pi. i. 



Sciurus variegatoides, OGILBY, Proc. Zool. Soc. Lond. 1839, 117. 



Sciurus richardsoni, GRAY, Ann. and Mag. Nat. Hist, x, 1842, 264 (nee Bachman, 1838). 



Sciurus boothice, GRAY, List Mam. Brit. Mus. 1843, 139 (=S. richardsoni, Gray). 



Sciurus griseocaudatus, GKAY, Zool. Voy. Sulphur, 1844, 34, pi. xiii, fig. 2 (animal), pi. 



xviii, figs. 7-12 (skull and teeth). 



Sciurus fuscovariegatus, SCHINZ, Synop. Mam. 1845, 15 ( = S. richardsoni, Gray). 

 Sciurus adolphei, LESSON, Descrip. de Mam. et d'Ois. 1847, 141. 

 Sciurus pyladei, LESSON, Descrip. de Mam. et d'Ois. 1847, 142. 

 Sciurus dorsalis, GRAY, Proc. Zool. Soc. Lond. 1848, 138, pi. vii. 

 Sciurus rigidus, PETERS, Monatsb. Kongl. Preuss. Akad. Wissensch. zu Berlin, 1863, 



(1864), 652. 

 Sciurus oculatus, PETERS, Monatsb. Kongl. Preuss. Akad. Wissensch. zu Berlin, 1863, 



(1864). 653 (formerly referred by me to my "8. colliosi" S.arizonetisis, 



Coues). 



Sciurus intermedius, " VERREAUX", GRAY, Ann. and Mag. Nat. Hist. 3d ser. xx, 1867, 421. 

 Sciurus nicoyana, GRAY, Ann. and Mag. Nat. Hist. 3d ser. xx, 1867, 423. 

 Sciurus melania, GRAY, Ann. and Mag. Nat. Hist. 3d ser. xx, 1867,425 (formerly referred 



by me, with a query, to S. carolinensis). 

 Sciurus collicei, ALLEN, Mon. N. Am. Rod. 1877, 738 (the synonyms, except S. arizo- 



nensis, Coues, but not the specimens, nor the descriptive text). 



Sciurus boothicB, ALLEN, Mon. N. Amer. Rod. 1877, 741 (synonyms, text, and specimens). 

 Sciurus hypopyrrhus, ALLEN, Mon. N. Amer. Rod. 1877,746 (synonyms, except Macroxus 



maurus, Gray, text, and specimens, except the series from Guayaquil and the 



text relating to them). 



XOTE. This species, as at present defined, includes both my 8. boothice 

 and S. hypopyrrlms, except certain specimens from Guayaquil described 

 by me under the latter name, which represent, according to Mr. Al- 

 ston's determination of them, 8. stramineus. In uniting my S. boothice 

 and 8. hypopyrrhus, Mr. Alston confirms a suspicion I had already ex- 

 pressed of their possibly proving identical. I kept them apart mainly 

 from the impression made upon me by the Guayaquil specimens, which 

 I felt pretty sure were specifically different from those I referred to 8. 



