642 RODENTIA 



light hair-brown fading to smoky grey on lower part of sides. 

 Rump light broccoli-brown tinged with reddish brown in median 

 line, and forming in most specimens a distinct though not very 

 noticeable contrast with dorsal stripe. Whole ventral surface 

 pale smoke-grey, washed to a varying degree with yellowish 

 brown, especially along median line, the slate-grey bases of the 

 hairs appearing irregularly at surface. Feet dull white ; a dark 

 shade at inner side of ankle. Ears thinly haired, dull reddish 

 brown. Tail bicolor, dark brown above, buffy whitish below. 

 The winter pelage tends to be darker than the summer pelage, 

 with less contrast between colours of dorsal stripe and sides ; but 

 dull, brownish individuals are not infrequently met with in 

 summer. 



SJmU and teeth. — Skull largest among the Continental Euro- 

 pean members of the group, iJ. glareolus hallucalis perhaps excepted. 

 In form it shows no sjjecial peculiarities. Brain-case relatively 

 large, a peculiarity moi'e noticeable in smooth, young-adult skulls 

 than in those which have become angular with advancing age. 

 Zygomata not very abruptly spreading in front, the middle 

 portion of the two arches usually almost parallel. Incisive 

 foramina narrow (normal), the width of the two together about 

 one-quarter length. Molars distinctly larger than in E. glareolus 

 glareolus, but pattern of enamel folding with no other peculiarity 

 than that the third re-entrant angle on inner side of m^ is usually 

 present (see Table, p. 631). 



Measurements. — Adult male from Les Plans, Vaud, Switzer- 

 land : head and body, 105; tail, 65; hind foot, 19*8. Average 

 and extremes of four adults from Briinig, Switzerland : head and 

 body, 105-7; tail, 61-7; hind foot, 19-3 (18-8-20). Average 

 and extremes of ten adults from Andermatt, Uri, Switzerland : 

 head and body, 106-3 (101-112); tail, 64*5 (59-72); hind foot, 

 18-8 (18-6-19). Average and extremes of four adults from 

 Goschenen, Uri, Switzerland: head and body, 117-7 (114-123); 

 tail, 64-2 (62-68;; hind foot, 19-6 (19-20). Two adult males 

 from Gordola, Locarno, Ticino, Switzerland : head and body, 

 103 and 103; tail, 62 and 65; hind foot, 19-6 and 19-3; ear 

 from meatus, 13-5 and 13. Adult male and female from 

 Lugano, Ticino, Switzerland : head and body, 106 and 107 ; tail, 

 48 and 49 ; hind foot, 19-8 and 20. For cranial measurements 

 see Table, p. 653. 



Specimens exawmed.^Oue hundred and seventy-five, from the following 

 localities : — 



Prance : Chamonix, Haute-Savoie, 8 (U.S.N.M.). 



Switzerland: Les Plans, Vaud, 7 (U.S.N.M.) ; Zermatt, Valais, 10 

 (U.S.N.M.) ; Briinig, Berne, 20 (U.S.N.M.) ; Meiringen, Berne, 11 (U.S.N.M.) ; 

 Genthal, Berne, 1 (Geneva ; type of bicolor Fatio) ; Lucerne, 2 ; Vitznau, 

 Lucerne, 10 (B.M. and U.S.N.M.) ; Goschenen, Uri, 8 (U.S.N.M.) ; Ander- 

 matt, Uri, 49 (U.S.N.M.); Vulpera-Tarasp, Grisons, 14 (Rothschild); 

 Campfer, Grisons, 5 (Rothschild) ; Untervatz, Grisons, 3 ; Poschiavo, 

 Grisons, 1 (Mottaz) ; Faido, Ticino, 1 (U.S.N.M.) ; Lugano, Ticino, 5 

 (U.S.N.M. and Mottaz) ; Gordola, Locarno, Ticino, 3. 



