EVOTOMYS 235 



10. Evotomys erica Barrett-Hamilton and Hinton. 



1913. Evotomys erica Barrett-Hamilton and Hinton, Ann. Mag. N. H., 

 [8], 12, p. 361; Barrett-Hamilton, Hist. Brit. Mamm., 1914, 2, 

 p. 424. 



Type.—BM., No. 14.1.30.5; adult male, collected April 15, 

 1913, by P. D. Montague. 



Type locality. — -Raasay, near Skye, Scotland. 



Range. — Known only from the island of Raasay : " Trapped in 

 big heather, rather scarce." 



Characters. — Resembling E. alstoiii in general appearance and 

 colour, but slightly larger, with longer ears, more robust tail, 

 stronger skull and larger cheek-teeth. 



Size large (hind-foot 18-20 mm. ; condylo-basal length of 

 skull 25-2-25-4 mm.). General colour of upper parts deep russet; 

 under surface much more heavily washed with buff than in E. 

 alstoiti, and sharply contrasted with the dark brown flanks. 

 Under surface of tail clear buff, sharply contrasted with dark 

 brown upper surface. 



Skull most readily distinguished from that of E. alstoni by the 

 larger cheek-teeth, broader zygomatic arches, heavier jugals (their 

 upper borders boldly convex), more prominent and extensive 

 post-orbital crests, less convex parietal region, wider pterygoid 

 fossae, correspondingly narrower choanee, and vertical instead of 

 ventrally divergent j^terygoids. Antero-internal part of each 

 auditory bulla bluntly pointed instead of being rounded. Outer 

 wall of infraorbital canal slightly wider, the rostrum rather 

 deeper and narrower, with smaller and narrower palatal foramina. 

 Interorbital region slightly more constricted. Palate relatively 

 wider. Mandible larger than in E. alstoni, with more robust 

 coronoid, condylar and angular processes ; its interior border much 

 thicker, the lower margin of the angular process broadened 

 throughout into a wide surface for the insertion of the superficial 

 part of the masseter muscle ; the width of this surface is 1-4 mm., 

 but in E. alstoni the corresponding facet measures only 0-4 mm. 

 in width. 



Cheek-teeth of normal form, differing from those of E. alstoni 

 merely by their larger size; m^ with a deep third inner fold, and 

 usually with a large fourth inner salient angle. 



For external and cranial measurements, see tables at end of 

 I volume. 



Remarks. — An adult female taken in October is thinner 

 furred, darker above, and with a less heavy wash of buff below; 

 possibly this specimen is iai a rather worn breeding pelage. 



11. Evotomys ponticus Thomas. 

 1906. Evotomys ponliciis Thomas, Ann. Mag. N.H., [7], 17, p. 417. 



Type.~B.M., No. G.3.6.173; male, collected bv A. Robert, 

 October 29, 1905. 



