204 MICROTIN^ 



above ; its lower surface and long pencil greyisli- white. Incisors 

 pale yellow. 



In a second specimen (skin of a young adult) the colour is 

 much darker and less ochraceous ; dorsal surface dusky brown, 

 almost blackish over the middle region of the back, with a very 

 short tipping of pale rusty on some of the hairs, imparting a 

 faint rusty general tint ; sides ochraceous ; ventral surface rusty 

 buff, palest on throat. 



For external and cranial measurements, see tables at end of 

 volume. 



Remarks. — In describing this animal, Allen thought that he 

 was dealing with the species referred long ago by MiddendorfE 

 to " Myodes scMsticolor " ; but subsequent discoveries, and the 

 re-examination of Middendorfi's material by Vinogradov, show 

 that MiddendorfE's animal really was a Myopus and Allen's 

 conjecture wrong. 



Judging from the description, L. o. chrysogaster is possibly 

 most nearly related to the more recently described L. amurensis ; 

 it is to be hoped that a direct comparison of these two forms 

 will be made possible in the near future. 



[Myodes kittlitzii Brandt. Middendorff (Sibir. Keise, 2, 

 Th. 2, p. 107) says : — " Unser Akademisches Museum besitzt durch 

 Kittlitz noch einen Lemming aus Kamtschatka, welcher von 

 Brandt (in Tschichatscheff, Voyage Sci. dans I'Altai, p. 14) 

 Myodes kittlitzii benannt, aber nicht beschrieben worden ist. 

 Dieses Thier steht dem Myodes obensis hochst nahe, und wir 

 bediirfen ferneren Materiales um zu entscheiden, ob es nicht 

 eine seltene albinotische Varietat der obengenannten Art sein 

 mochte. Der Balg (Wintertracht) dieses Exemplares ist durch- 

 gangig und einfartig rostgelt ; er ercheint auflallend heller als 

 selbst die Wintertracht de Myodes obensis, bei genauerer Betracht- 

 ung finden wir jedoch, dass diese hellere Farbung nicht die Folge 

 einer helleren Farbung der Haarspitzen ist, sondern dadurch 

 bedingt wird, dass die Wurzelhalfte der Haare nicht dunkel- 

 braunschwarz ist, wie stets beim Myod. obensis, sondern weiss- 

 grau."] 



3. Lemmus amurensis Vinogradov. 

 1924. Lemmus amurensis Vinogradov, Ann. Mag. N.H., [9], 14, 

 p. 186. 



Type.— Zool Mus. Kuss. Acad. Sci., No. 13722; adult female, 

 collected April 20, 1914, by C. Dorogostaisky. 



Type locality. — Pikan, on the Zeya River, a tributary of the 

 Amur River, East Siberia. 



Range. — Known only from the type locality. 



Characters. — Size very small, head and body 96 mm., hind- 

 foot 14, condylo-basal length 26-2. 



Fur long and soft. Colour of upper surface uniform brown 

 (near " verona brown ") faintly tinged with rusty on head and 



