Miller A New Deer from Costa Rica. 37 



length, 237 (250); basilar length, 220 (235); median palatal length, 155 

 (165); palatal width between anterior molars, 38 (46); least interorbital 

 width, 57 (64): greatest width between lower rims of orbits, 101 (112); 

 zygomatic breadth, 94.6 (108): mastoid breadth, 74 (86); occipital depth, 

 58 (57); mandible, 190 (195); upper toothrow (alveoli), 68 (68) ;\ lower 

 toothrow (alveoli), 79 (82); length of the three lower premolars together 

 (alveoli), 31 (33). 



Specimens examined. Two skins and four extra skulls, all from Costa 

 Rica. 



Remarks. In addition to its larger size this species differs from Odo- 

 coileus truei in the distinctly speckled back and sides. In the smaller 

 animal the light subterminal bands on the back are broader and less 

 strongly contrasted with the dark tips, while on the sides this element 

 of the marking is so extended as to cover practically all of the visible 

 part of the hair. As a result the sides are uniformly colored, without 

 trace of gri/zle. This condition is repeated in Odocoileus thomasi, the 

 only species equalling 0. costaricensis in size. 



JType of 0. truei: upper toothrow (alveoli), 66; lower toothrow 

 (alveoli), 73; length of the three lower premolars together (alveoli), 28. 

 In the type of 0. thomasi the corresponding measurements are 70, 80 and 

 32. 



