nptc European M<i»imuh. 459 



l)yromys rohusttis, sp. n. 



Ti/pe. — Adult female (in spirit). Collectcil at Rustcliuk, 

 Bulgaria, by K. Anclerseii. 



Characters. — h\kc J h/romf/a tii'tedula, but skull broader and 

 more robust, with relatively shorter rostrum and much en- 

 larged audital bulla*. 



Measuritnmtii. — Head and body Do mm.; tail 87; hind 

 foot 22 ; ear from meatus lo ; condy lo-basal length of skull 

 25'G ; zygomatic breailth 1()*8 ; mastoid breadth li3'<> ; man- 

 dible 15"2 ; maxillary tooth-row (alveoli) '6'ii ; mandibular 

 tootli-row 4*2 (teeth slightly worn). 



Sfieci'men examined. — Tho typo. 



liemarks. — In its peculiar broad robust skull, relatively 

 short rostrum, and enlarged amlital buUui this animal differs 

 from all the hitheito known European races of D. nitedula 

 as well as from the Asiatic members of the genus. 



Microtus dentutus, sp. n. 



Tt/pe. — Adult female (skin and skull). Collected at Moli- 

 nicos, Sierra de Segura, Albacete, Spain, December 11, 1908. 



Characters. — Similar to Microtus cabrerce, Thomas, of 

 Central Sj)ain, but larger, tlie skull about 30 mm. in eondylo- 

 basal length ; teeth excessively heavy, larger than in any 

 other known European Microtus, the maxillary tooth-row 

 8 mm. in length ; 7H3 with completely closed triangle on outer 

 side ; colour paler and less buffy. (Ground-colour of i)ack and 

 sides less yellow than the cieam-buff of Uidgway, the general 

 effect a peculiar buffy grey, noticeably different from the olive 

 or bistre of M. cabrerce; underparts light grey, scarcely 

 tinged with buff.) 



Measurettietits. — Typf". Head and body 125 mm.; tail 40; 

 hind foot (dry) 22 ; upper length of skull 2"J'4 (in type ot" 

 cabrerce '2Q'6) ; condylo-basal length 30+ (in lype oH cubrercB 

 27*0) ; mandible 190 ; maxillary tooth-row (alveoli) 80 ; 

 mandibular tooth-row 7'6. 



Specimen examined. — The type. 



liemarks. — 1 owe to the kindness of Mr. A. Cabrera the 

 0[jportunity of examining the type and only known specimen 

 of this species. The animal is evidently related to .\Iicr0tu4 

 cabrerce, but its unusually large molars immediately distin- 

 guish it among the Eurojx'an members of the genus. The 

 presence of a completely closed triangle in the posterior lower 

 molar is equally unusual. 



31* 



