781 



thickened, palmar and plantar tubercles somewhat reduced in 

 size, crowded into a relatively smaller area than in P. subterraneus ; 

 tail short, scarcely more than one-quarter as long as head 

 and body. 



Colour. — Upper parts a peculiar drabby grey, varying 

 considerably in exact shade as described under the subspecies, 

 the sides often with a noticeable buffy tinge ; underparts and 

 feet whitish in rather marked contrast with back ; tail whitish, 

 the upper surface usually clouded with brown. 



Skull. — The skull resembles that of Pitymys lusitanicus, but 

 its general size is greater, the zygomata are more abruptly 

 spreading, the brain-case is relatively 

 shorter and deeper, and the occiput 

 is more obliquely truncate, so that 

 condyles are more plainly visible 

 when skull is viewed from above. 

 Depth of rostrum immediately be- 

 hind incisors about equal to width 

 in same region. Interorbital con- 

 striction about as wide as anterior 

 portion of rostrum, its dorsal surface 

 convex laterally ; temporal ridges 

 low and indistinct, scarcely visible 

 except in rather old individuals, 

 sometimes rather closely approach- 

 ing each other, though without 

 coalescing, and seldom if ever 

 extending back over parietals. 

 Length of brain-case about equal 



to or slightly less than width across zygomatic roots, the outline 

 when viewed from above sub-quadrate or occasionally almost 

 circular ; postorbital ridges low but attaining 

 a fair degree of development in old age, 

 never, however, strongly angled. Auditory 

 bull* well developed, smooth, their greatest 

 diameter contained about three and a half 

 times in condylobasal length of skull. Palate 

 showing no special peculiarities. Incisive 

 foramina as usual in the genus, their longi- 

 tudinal diameter about equal to one-half 

 distance from gnathion to alveolus of first 

 molar. 



Teeth. — The teeth of Pitymys ibericus so 



x 5 - exactly resemble those of P. lusitanicus as 



to need no detailed description. They are, 



however, larger throughout, and the upper incisors project more 



■strongly forward, so that practically the entire front face is 



visible when skull is viewed from above.' 



FIG. 161. 

 Pitymys iberimts. Nat. size. 



lia. 162. 



Pitymys ibericus. 

 "Enamel pattern. 



