MAMMALIA RODENTIA. 261 



mophilus, so wie iiber die Klassification tier Faniilie der 

 Eichhornchen, von J. F. Brandt. 



Under this title Brandt has, in the ' Bulletin de la Classe Physico- 

 mathematique de 1'Acad. de Petersb.' ii (1844), p. 357, given a distin- 

 guished contribution towards a more exact acquaintance with the family 

 Sciurina. An abstract of the above is also contained in the 'lust.' p. 299. 

 He first of all divides this family into two tribes : Campsiurina and Arcto- 

 myma ; the former including the genera Scitirus, Pteromys, Sciuropterm, and 

 Tamias, the latter the genera Arctomys and Spermophiliis. According to our 

 author, there must be in Kussia, besides the Baibac, two other species allied 

 to this and Arctomys Mouax, viz. the Marmot ( ? A. camtschatica), already 

 mentioned by Pallas as the A. Builac varietas camtschatica, and another 

 recently discovered in the Altai regions, and very similar to this, which may, 

 perhaps, constitute a distinct species, the A. luibanica. Brandt then pro- 

 ceeds to the arrangement of the species in the genus Spermophilus, in which 

 undertaking a far richer amount of material has been at his command than 

 at mine. He divides the genus into two subgeuera. 



Subgenera I. Colobotis ; Molariuni superiorurn primus sccundo et tertio 

 duplo vel vix duplo minor, apice sub 3 4 lobatus et acie compressa, trans- 

 versa, subobliqua, satis lata, truncata, acuta instructus. Molariuni supe- 

 rior um 2, 3 et 4 corouse cuneato-triaugulares, facie interiore compressa;, 

 valde augustse et acnminatse. Plica? centrales lougitudine subaequales, valde 

 elevata?, in margine coronas exteruo parallels, in margine corouse iiiterno 

 autem angulo plus miuusve acuto introrsuni couniveutes et parte iuterua 

 conjunctae. Auricula? truncatee vel subtruucatse, brevissima?, interduni fere 

 margiuiformes. Planta? nudge vel pone digitorum basin ad calcareum usque 

 vel in calcaueo tautum pilosaj. Here belong all the European and Asiatic, 

 as well as all the Russian, Marmots. 



(a) Plants? adultis totse nudge (in calcanci lateribus tamen pilis rigidiusculis 

 incumbcutibus limbatse et ex partc tectse) ; auriculae submarginiformes trun- 

 cates ; cauda submediocris vel brevis, podario longitudiue subsequalis, (a) 

 oculorum ambitus capitis lateribus coucolor. (1) Sp. fiilvus, Bias, et Keys. 

 (2) Sp. riifescens, K. B. (A. undulatus), /3, oculorum ambitus albus vel albi- 

 dus, a capitis lateribus colore pallidiore distiuctus. (3) Sp. erythrogenys, 

 Brandt ; capitis superior facies, apice rostri excepto, griseo, nigricante et 

 albido mixta ; cauda circiter \ 5 corporis lougitudinis, pilis ferrugiueis 

 mgris plerumque mixtis, patentibus, subdistichis obsessa. Body 9 lo", 

 tail with hairs 2" 3'" 3". (4) Sp. brevicauda, Brandt (Sp. mugosarisct's, 

 Eversm.), capitis superior facies cum rostri dorso fere tota subsordide ferru- 

 ginea, vix nigro mixta ; cauda g l corporis longitudiuis, ultra medium et in 

 lateribus pilis subadpressis ferrugiueis, apice albis obsessa. Body 8" 9i}"', 

 tail with hairs 1" G" . Brandt would distinguish this species from Lich- 

 tenatein's Sp. mugosariscus, which was hitherto only known from the Berlin 



