18 REVIEWS. 



40. Arvicola rutilus, Pallas.- Several examples of this North- 

 European species of Yole were obtained on the Amoor. 



41. Arvicola ampMMus. — A single specimen of this European Yole, 

 obtained by Herr Maximowicz, belongs to the short-tailed variety, A. 

 terrestris, which is considered by De Selys, and other authorities, as a 

 separate species. Herr von Schrenck himself observed others of the 

 same species. 



42. Arvicola saxatilis, Pallas. — Full and accurate details are given 

 of this Yole, which has not been recognised since the time of its de- 

 scriber, Pallas, from a single example obtained by Herr Maximowicz 

 on the Amoor. Pallas gives Transbaikalia and Mongolia as its habitat. 



43. Arvicola maximowiczii nov. sp. — This new species of Yole is also 

 due to the researches of Herr Maximowicz, whose name it bears. A 

 single specimen only was obtained in October, 1856, on the Upper 

 Amoor. Arvicola maximo'wiczii belongs to the typical group of the 

 genus, as arranged by Blasius, being allied to A. arvalis (Pall.), and 

 A. campestris (Blasius), and more nearly still to A. subterraneus of De 

 Selys, though having rather longer ears. 



44. Siphoneus aspalax, Pallas. — A single example of this singular 

 animal, obtained on the Upper Amoor, agrees well with Pallas' Siberian 

 species. No trace of it was met with on the Lower Amoor. 



45. Castor fiber. — No traces of the beaver were met with on the 

 Amoor or its confluents, though it is said that the Busso-American Pur 

 Company obtained a skin in 1853-4, at their temporary station at the 

 south end of Sachalin. 



46. Lepus variabilis. — The Polar Hare is very common in Amoor- 

 land and Sachalin, adopting in winter the pure white dress (with the 

 exception of the black ears), as in the typical European form. 



47. Lagomys hyperboreus. — A pair of Lagomyes, obtained by Herr 

 Maack in Amoorland, are considered to belong to this little-known Pal- 

 lasian species. A comparison of examples from other parts of northern 

 Asia seems to show that there are several varieties in the colouring of 

 this animal, which appears to be the only Pika inhabiting this district. 



48. Sus scrofa. — The wild hog of the Amoor seems specifically iden- 

 tical with the European Sus scrofa. No difference to speak of was 

 found between two skulls of young individuals from Amoorland and 

 others from the Caucasus. Brownish-black examples are spoken of as 

 having been observed ; but this colour is also sometimes to be seen in 

 European specimens. 



49. Ovis ((Egocerus) montana* — No traces could be found of this 



* We are very much disposed to question the fact of this Oris being identical with the 

 Ovis montana of North America. It is Ovis nivicola of Eschscholtz. Middendorf gives 

 the spruce partridge of Canada ( Tetrao canadensis) as occurring in Northern Asia ; 

 but his examples, on further investigation, were proved to belong to quite a different spe- 

 cies (Tetrao falcipennis). The forms of the higher northern latitudes of the eastern and 

 western hemispheres, though very similar, are, except in the polar regions, usually speci- 

 ficallv distinct. 



