104 Merriam $ew Mammals from Oozumel Island. 



parts varying 1 from soiled whitish to pale buffy salmon; ears dark brown, 

 darkest on outer half: tail dusky, paler below. 



Cranial characters. Skull large and heavy, with strongly marked 

 superciliary beads, long rostrum, and long incisive foramina. Closely 

 related to aquaticu*, from which it differs in the following characters: 

 anterior roots of zygomata more depressed and less spreading; orbital 

 angle of frontal less marked; posterior part of braincase broader, carry 

 ing the lateral beads outward posteriorly, so that they form almost a 

 straight line from side of occiput to angle of orbit; incisive foramina 

 longer and more open. 



Remarks. Compared with aquaticus, the only species to which it bears 

 any near resemblance, the color in fresh pelage is grayer and darker 

 (less golden fulvous), in worn pelage redder the rump and hinder part 

 of back more rusty; ears and face darker, the face strongly grizzled 

 with black hairs. The underparts are never buffy yellow as in aquati- 

 cus. v. 



Measurements. Type specimen (^ ad.): total length 332; tail verte 

 brae 182; hind foot 35, Average of 5 adults from type locality: total 

 length 315; tail vertebrse 170: hind foot 34.5. 



