512 Dr. C. I. Forsjtli Major on 



— of M. agrestis* and of M. arvalis-f, — is revived for tlie 

 St. Gothard form :|:, and, as stated above, iu 185-4 is applied 

 to the type of M. duodecimcostutus. 



To Slim up : both the specimens on which rests tlie " Arvi- 

 cola duodeciincostutus, \)e Selys/^ are to be assigned — the 

 type on the strength of the figured skull, the iMontpellier 

 specimen on the authority of Gerbe — to a characteristic 

 group of the subgenus Pityniys, represented by various 

 species from Southern Friince (also from the Pyrenean 

 Peninsula and. from Montenegro). If the type specimen of 

 Microtus duodec'nncost atus is not forthcoming, we must await 

 the rediscovery of this species in the neighbourhood of Geneva 

 before deciding whether it is or is not specifically identical with 

 the one from Montpellier. In any case the name duodecim- 

 costatus (1839) antedates i\\ei\Q.va.eincertus (1810), tbe latter, 

 moreover, referring originally to some specimen from 

 St. Gothard, considered by De Selys to be nearly related to 

 M. Savii, but which from its size seems rather to be some 

 form of the M. arvalis group. 



2. Microtus {Pitymys) lusitanicus (Gerbe). 



Arvicola (Microtus) lusitanicus, Z. Gerbe, Rev. Mag. Zool. (3) vii. 

 pp. 44, 46, 47 (1879j ; id. Bull. Soc. Zool. France, v. p. 56 (18S0). 



There would be some justification for ignoring the above 

 specific name proposed by Gerbe, since, according to his own 

 declaration, the species has not been described, but only 

 " signalee " ; moreover, the two characters which were made 

 known, viz. small size of the animal — " faille inferieure j\ 

 celle de toutes les especes qui vivent en France "§ — and 

 reduced condition of the middle outer triangle of »i'\ ^I'P'y 

 equally well to two distinct species of the AVestern Pyrenean 

 Peninsula, the one from Galicia, the other from Cintra and 

 presumably other parts of Portugal. Sinct; the former may 

 or may not occur likewise in the northern districts of 

 Portugal, wdiereas the skull on which the species M. lusi- 

 tanicus rests is from Portugal, I adopt this name for a species 



* De Selys-Longchamps, Faune Beige, i. (liiege, 1842) p. 36. 



t Ue Selys-Loiigchamps, in ' Atti 8esta L'iun. Scienz. Ital. tenuta in 

 Milano,' 1844, p. 319 (Milan, 1845). 



X Rev. Zool. X. pp. 308, 309 (1847). "When alluding to the name 

 A. liaillonii and to "the Swiss specimen of Schinz " (' Siiugethiere 

 Deutschlands,' p. 384) Biasing was not aware tliat at the Congress of Turin 

 and in the ' Faune Beige ' this name was apjiliid to a specimen from the 

 Canton Zurich, and in 1847 to quite another sjjecimen (the one from the 

 kSt. Gothard), both collected by Prof. Schinz. 



§ Rev. Mag. Zool. (3) vii. p. 44, footnote 1 (1870). 



