STEJNEGER] ANIMALS AND PLANTS OF NORWAY 477 
few cases enough is already known to indicate the probable meaning 
of the facts thus far recorded. Among these the case of the red- 
backed mice of the subgenus Evotomys is the most illuminating. 
In 1900 Gerrit S. Miller, Jr., published a preliminary revision of 
the group (Proc. Washington Acad. Sci., 11, pp. 83-109) based on 
301 specimens from the regions with which we are here concerned. 
In northern and western Europe he distinguishes 10 forms belong- 
ing to three separate sections, viz. : 
(a) E. rutilus which inhabits Arctic Asia and Europe west to 
Tromsce, in Norway. 
(b) A second section consisting of three allied but geographically 
disconnected species : 
(1) E. norvegicus, from Norway north to Saltdalen (speci- 
mens examined, however, with one exception, all from 
Bergen Stift) ; 
(2) E. nageri, from the Alps; and 
(3) £. vasconie, from the Pyrenees. 
(c) The third section embracing the species E. hercynicus (= E. 
glareolus Auctorum), with five geographically connected subspecies, 
as follows: 
(1) E. hercynicus hercynicus, from Germany ; 
(2) E. hercynicus helveticus, from the lowlands of Switzerland ; 
(3) £. hercynicus rubidus, from the coast countries bordering 
the North Sea on the south; 
(4) E. hercynicus. brittanicus, from England and Scotland; and 
(5) E. hercynicus suecicus, from eastern Sweden. 
The distribution of the mageri-group (b) strongly suggests that 
of Lemmus lemmus, the variable hare, the reindeer, the ptarmigan, 
and several of the other animals of the same fauna, while the 
hercynicus-group (c), in turn, coincides with a large assemblage 
of species which entered Sweden from the south and also extended 
into non-boreal Britain. The only serious deficiency in the range 
of the nageri-group, as known to Miller in 1900, was its absence in 
Great Britain. That this discrepancy was only due to the im- 
perfect status of the European faunal record was shown three years 
later by Barrett-Hamilton (Proc. Irish Acad., xxiv, Sec. B, pt. 4, 
September, 1903, pp. 315-319) who described the new species 
Evotomys skomerensis, from a small island off the southwest corner 
of Wales, as “closely related to Evotomys norvegicus Miller, of 
Norway, E. nagert (Schinz) of the Alps, and E. vasconmie Miller, 
of the Pyrenees,’ and “almost indistinguishable from those of 
