EVOTOMYS 



627 



postero-external tubercle smaller than the others (about half as 

 large as posterointernal). Tail about half as long as head 

 and body or slightly more, its annulations ill defined and 

 completely concealed by the dense covering of hair ; pencil 

 well developed, usually about one-sixth as long as vertebras. 

 Mammae: p 2-2, i 2- 2 = 8. 



Colour. — Upper parts brown with a decided reddish or 

 ochraceous suffusion, especially along back ; sides and rump 

 usually lighter than back, often with a tinge of grey, but never 

 forming a decided contrast as in Evotomys rufocanus ; under- 

 pays light grey with or without a yellowish brown wash ; feet 

 greyish ; tail obscurely bicolor. 



Skull. — The skull of Evotomys glareolus is small and lightly 

 built, the surface smooth and rounded, without noticeable ridges 

 or depressions for muscular attachment. . Dorsal profile in 

 general slightly convex throughout, 

 though flattened or even a little con- 

 cave in interorbital region, the nasals 

 sloping rather abruptly forward, their 

 surface nearly flat ; there is usually 

 no sharp distinction between dorsal 

 and posterior outlines, the profile 

 merely bending abruptly downward 

 posteriorly over somewhat obliquely 

 truncate occipital region ; ventral 

 profile shallow-concave anteriorly, then 

 essentially straight to lower surface of 

 bulla ; depth of skull considerably 

 greater posteriorly than anteriorly, so 

 that the general outline formed by 

 the two profiles is distinctly wedge- 

 shaped. Brain-case sub-circular or 

 very broadly oval in outline when viewed from above, sometimes 

 a little squared at sides or in front ; the surface smooth except 

 for the small but evident postorbital processes, a distinct trace 

 of the lambdoid crest extending downward from outer extremity 

 of interparietal to meatus, and a shorter but more noticeable 

 vertical ridge along upper part of suture between occipital and 

 petrous portion of temporal, this ridge lying when skull is 

 viewed from above in axis of concavity between paroccipital 

 process and occipital condyle ; in old individuals there is also a 

 slightly indicated angularity extending along sides of brain-case 

 and across median lambdoid region ; interparietal convex behind, 

 double concave in front, its lateral extremities acute or slightly 

 truncate, its greatest antero posterior diameter about one-half to 

 one-third transverse diameter ; occiput when viewed from behind 

 broadly arched, slightly flattened above and at sides, the median 

 portion of brain-case not rising conspicuously above lambdoid 

 level; paroccipital processes slender but well developed, free 



KG. 124. 

 Evotomys glareolus. Wat. size. 



