776 ' RODENTIA 



present in the Paris specimen* as well as in the eleven skulls 

 examined by Gerbe. No approach to this form of interparietal 

 has been seen in other members of the savii group, though it is 

 sometimes approximated in ibericus and its allies. The depth 

 of skull relatively to its length is intermediate between that of 

 P. pyrenaicus and P. ibericus. 



PITYMYS LUSITANICUS Gerbe. 



1879. Arvicola (Microtus) lusitanicus Gerbe, Rev. et Mag. de Zool., 3rd ser., 



vii, p. 44. 

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



7th ser., xv, p. 512, May, 1905. 

 1908. Ptttymys] lusitanicus Miller, Ann. and Mag. Nat. Hist., 8th ser., i, 



"p. 204, February, 1908. 

 1910. Pitymys lusitanicus Trouessart, Faune Mamm. d'Europe, p. 193. 



Type locality. — Portugal. 



Geographical distribution. — Portugal ; limits of range un- 

 known. 



Diagnosis. — Size small (hind foot, 14 • 5 to 15 • 5 mm. ; concly- 

 lobasal length of skull, 22 ■ 6 to 23 mm.) ; skull slender and 

 lightly built, not depressed, the dorsal profile convex through- 

 out ; brain-case high and rounded, its depth, including auditory 

 bulla, about 74 per cent of occipital breadth ; third upper molar 

 scarcely as long as second, normally without closed triangles, its 

 posterior loop short, simple, without inner re-entrant angle, 

 directed backward and slightly outward ; upper incisors rather 

 strongly projecting ; colour dark. 



Colour. — The colour is essentially as in Pitymys subterraneus, 

 except that the underparts are a less clear grey. Upper 

 parts a dark hair-brown tinged with bister or sepia, and very 

 faintly grizzled by black tips and light reflections. Underparts 

 a dull buffy grey, in some specimens becoming almost a dull 

 ochraceous-buff on cheeks and on sides along border of dark area ; 

 feet buffy grey without dusky wash ; tail obscurely bicolor, buffy 

 white below, dusky mixed with buffy white above. 



Skull. — The skull very closely resembles that of Pitymys 

 nebrodensis. Dorsal profile convex throughout, or somewhat 

 flattened ininterorbital region. Interorbital constriction wider 

 than anterior portion of rostrum, flat or slightly concave laterally, 

 the outer edges marked by faint ridges in extreme old age, these 

 ridges rarely extended back across parietals. Brain-case high, 

 strongly rounded off at sides, its length to back of interparietal 

 about equal to breadth over zygomatic roots. Posteriorly the 



* Though presented by Gerbe this specimen is not likely to be one of 

 those whose cranial peculiarities were mentioned by the describer of the 

 species. It was originally mounted with the skull inside, and the nose 

 and upper lips were found to be attached to the rostrum when the skull 

 was removed for my examination, through Dr. Trouessart's kindness, in 

 1908. 



