PITYMYS 765 



tion in P. mbterraneus. Second upper molar showing the 

 maximum of the tendency common to the three related 

 forms, druentius, fatioi and multiplex, for the inner side of third 

 triangle to develop an imperfect postero- 

 internal loop. At least some trace of this 

 tendency may be detected in nearly every 

 specimen, though it is often present in the 

 tooth of one side only. In the most extreme 

 examples that I have seen the supplemental 

 loop is as large as in many specimens of 

 Microtus agrestis, though in none is it com- 

 pletely isolated from the outer triangle. 



Measurements. — Adult male from Gor- 

 dola, near Locarno, Ticino, Switzerland 

 (type of leponticus Thomas) : head and body, „., Fl<3, u7 ,\. , 



(ic a. -i on ■■• j £ , to o irv a j u Pitymys multiplex. 



95 ; tail, do ; mndloot, lo o ; ear, 10. Adult Enamel pattern, x 5. 

 female from Locarno, Ticino, Switzerland : 

 head and body, 103 ; tail, 38 ; hind foot, 16-7 ; ear, 10. Adult 

 male from Bellinzona, Ticino, Switzerland : head and body, 1 00 ; 

 tail, 31 ; hind foot, 17. Adult male from Mirabello, Mon- 

 ferrato, Italy: head and body, 102; tail, 33; hind foot, 16"5; 

 ear, 9. Adult female from Prato, near Genoa, Italy : head and 

 body, 102 ; tail, 35 ; hind foot, 16. Adult female from Borzoli, 

 Genoa, Italy: head and body, 105; tail, 27; hind foot, 16; 

 ear, 10. Adult from "Vaccarezza, Italy : head and body, 110 ; 

 tail, 33; hind foot, 16 "5. For cranial measurements see Table, 

 p. 767. 



Specimens examined. — Thirty-nine, from the following localities : — 

 Switzerland : Near Locarno, Ticino, 5 (including type of leponticus) ; 

 Bellinzona, Ticino, 1 ; Oomano, Ticino, 4 (B.M. and Mottaz) ; near 

 Lugano, Ticino, 12 (B.M. and Mottaz) ; Pico Magadino, Ticino, 1 

 (Ghidini). 



Italy : Porlezza, Como, 3 ; Domodossola, Novara, 1 ; Ceresole d'Alba, 

 Turin, 1 (Turin) ; Mirabello, Monferrato, Alessandria, 1 (Turin) ; Vaccarezza, 

 6 (Genoa) ; Oaorsi, Antola, 2 ; Prato, Genoa, 1 (U.S.N. M.) ; Borzoli, 

 Genoa, 1 ; Florence, 1 (U.S.N.M.). 



Bemarlcs. — This species was first distinguished by Forsyth 

 Major, who, however, omitted to publish its description. Using 

 the name leponticus intended for it by Major, Thomas in 1906 

 referred to it in his description of the Asia Minor P. majori, and 

 thereby became responsible for the name. But in the mean- 

 time it had been described by Fatio with a mixture of other 

 forms, its type locality and history being afterwards cleared up 

 in the paper by Mottaz above referred to. 



2 6, 2 9. Locarno, Ticino, Switzer- O. Thomas (c & p). 5. 8. 2. 11-14. 

 land. (5. 8. 2. 11. Type of P. leponticus Thomas.) 



9. Borzoli, Genoa, Italy. Marquis G.Doria (p). 8.7.18.7. 



