'°6 EODKNTIA 



above sub-orbicular, the sides strongly rounded off. Occiput not 

 so obliquely truncate as in P. duodecimcostatus, and interparietal 

 less narrowly ligulate ; in both characters it more closely resembles 

 P. ibericus. Rostrum very slender, though perhaps not dispro- 

 portionately so. Auditory bullae smaller and more flattened than 

 in any other member of the group except P. depressus of central 

 Spain, their contrast with the large bullae of P. duodecimcostatus 

 particularly noticeable. Upper incisors very strongly projecting, 

 practically the entire front surface of the teeth visible when 

 skull is viewed from above. Molars showing no peculiarities of 

 enamel pattern, but smaller and weaker than in any other 

 member of the group, the small Iberian species not excepted. 



Measurements. — External measurements of type (adult female) : 

 head and body, 96; tail, 22; hind foot, 14-6. For cranial 

 measurements see Table, p. 790. 



Specimens examined. — Eleven, from the following localities in Prance : 

 St. Gilles, Gard, 5; Province of Var, 1; no exact locality ("Provence"), 4 

 (B.M. and U.S.N.M.). 



2 <$, 2 9. 

 1. 



PITYMYS THOMASI Barrett-Hamilton. 



1903. Microtus (Pitymys) thomasi Barrett-Hamilton, Ann. and Mag. Nat. 



Hist., 7th ser., xi, p. 306, March, 1903. Type in British Museum. 

 1905. Microtus (Pitymys) thomasi Major, Ann. and Mag. Nat. Hist., 



7th ser., xv, p. 515, May, 1905. 

 1910. Pitymys thomasi Trouessart, Paune Mamm. d'Europe, p. 188. 



Type locality. — Vranici, Montenegro. 



Geographical distribution. — Known only from Montenegro. 



Diagnosis. — Size about the maximum for a European species 

 of Pitymys (hind foot about 17 '4 mm., condylobasal length of 

 skull about 27 mm.). Cranial and dental characters essentially 

 as in Pitymys ibericus. Colour dark, as in P. lusitanicus. 



Colour. — Upper parts a dark hair-brown, tinged with bister 

 along back and with wood-brown on sides ; underparts slaty 

 grey washed with buffy ; feet dull whitish ; tail obscurely bicolor, 

 the median dorsal area brownish, the rest nearly white. 



Skull. — Except in its larger size the skull does not differ 

 very appreciably from that of true Microtus ibericus. The dorsal 

 profile is, however, slightly more convex, owing to the greater 

 depth of the anterior portion of brain-case, the general outline 

 of the brain-case tends more to assume a nearly circular form, 

 and the auditory bullae appear to be relatively larger. 



Teeth. — As in P. ibericus ibericus. 



Measurements. — Type (adult female): head and body, 118; 

 tail, 22; hind foot (dry), 17-4; ear, 10. Adult male: head 



