324 On a new Leucania//-o»i Brilish New Guinea. 



the skull. The teeth of the last-mentioned being, moreover, 

 indistinguishable from tho.^e of the M. arvaUs group, I would 

 assign it a place witliin tiie latter, of which it is a large- 

 sized and otherwise remarkable form, well deserving of a 

 specific name of its own. 



One form (possibly more) of a vole with teeth of the 

 M. arvaUs type is represented by jaws in some of our cavea 

 and river-deposits. ISot having as yet come upon fairly 

 complete skulls, I do not venture to assert that the species 

 AI. arvaUs was represented in Great Britain during Pleisto- 

 cene times; but the M. arvalis group certainly was. This 

 last circumstance will in due time presumably help to explain 

 satisfactorily the ])resent existence of a member of the M. ar- 

 vaUs group in the Orkney and Shetland Islands. 



XL. — DescrijjUon of a neio Leucania //•o?h British New 

 Guinea. By Geoege T. Bethune-Baker, F.L.S., F.Z.S. 



Leucania diagramma^ sp. n. 



$ . Head and face pale grey, barred with dark grey ; collar 

 pale grey, barred with darker grey; thorax greyish; patagia 

 edged on its upper margin with dark grey; abdomen greyish ; 

 legs pale grey, mid and hind pair with two fine dark lateral 

 lines. Primaries greyish brown, covered with fine whitish- 

 grey longitudinal lines, with a broad ])ale stripe in the cell 

 and a broader one below the cell ; a dark spot at the lower 

 end of the cell ; a postmedial row of small dark spots, on the 

 interior of which is a transverse indefinite band of whitish 

 grey ; termen darkly spotted : secondaries greyish, paler 

 towards the base. Underside : primaries pale grey, with the 

 dark lines of the upperside showing through ; a dark costal 

 spot a quarter from the apex ; termen finely and darkly 

 dotted : secondaries whitish grey, finely irrorated on the costa 

 ■with dark scales ; termen darkly s[)Ottcd. 



Tlxpanse 38 mm. 



The type is in my collection from Babooni, British New 

 Guinea (3600 feet), where it flies in September. 



