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Show 208 MR. J. LEWIS BONHOTE ON THE [Nov. 15, 1 have been unable to find any further particulars as to its range. Our knowledge of this species is so scanty that it is impossible to give any information concerning any changes of pelage it may undergo, but it does not appear to ever become very light. There is a specimen in the British Museum of a uniform deep dark ruddy brown, marked " Siberia, melanistic variety," but further material may prove this to be a normal pelage of the species. OCHOTONA HYPERBOREA (Pall.). Lepus hyperboreus Pallas, Zoogr. i. p. 152 (1831). Lagomys hyperboreus (Pall.) Wagner, Schreber, Saugeth. Suppl. iv. p. 121 (1844); Waterh. Mamm. ii. p. 30 (1848); Schrenck, Amurlande, i. p. 147 (1859); Radde, Reisen Slid. v. Ost-Sibirien, i. p. 232 (1862). Lagomys hyperboreus, varr. normalis, ferruginea, cinereoflava, fusca, Schrenck, Amurlande, i. p. 148 (1859). Lagomys littoralis Peters, SB. Ges. naturf. Fr. Berlin, p. 95 <1882). This species closely resembles the foregoing, except in its much smaller size. The five specimens from various parts of Eastern Siberia which are in the British Museum show a uniformity quite unusual among members of this genus. The general colour above is a light brownish rufous (mummy brown, Ridgw.), which is practically uniform throughout the upper parts, becoming rather purer rufous on the flanks owing to the absence of black tips to the hairs. The under parts are of a uniform rufous-white. The ears are small and scantily covered with whitish bairs. Skull. Except in its size the skull bears a close resemblance to that of 0. alpina. Dimensions (approx. from skin). Head and body 160 mm. ; hind foot 26 ; ear 14. Skull. Zygomatic breadth 20 mm.; length of nasals 11 ; length of molar series 7 ; interorbital breadth 5. Habitat. Described by Pallas as inhabiting N.E. Siberia. Schrenck has recorded it from the mouth of the river Maia on the mainland opposite Sakhalin, and I have examined specimens from Ussuri, Kentei Mountains in N. Mongolia, and Yakutsk. Schrenck describes, under the names given in the synonymy, several varieties of this species. There can be little doubt as to the specific identity of these varieties, and they probably represent the different pelages assumed by this species, but from the material at my command I am unable to give any further information. I also provisionally place 0. littoralis, from a similar locality, under the same name, as a large amount of material will be required before these various forms can be elucidated. OCHOTONA LADACENSIS (GUnth.). Lagomys ladacensis Giinth. Ann. Mag. Nat. Hist. ser. 4, xvi. p. 231 (1875); Blanford, J. A. S. B. xliv. p. 110 (1875); id. Yarkand |