330 Mr. O. Thomas on Two new 



great work on the Mammals of Central America, he lumped 

 under one heading four species described by Gray and one by 

 Peters ; for two of tlie five, namely H. irroratus and albo- 

 limhatus, are hairy-soled, with five pads, and the other three, 

 H. melanoleucus, longicaudatus, and adspersus, are naked- 

 soled and have six pads. To the first group there also belong 

 H. Allem, the South-Texan species, and II. Bulleri, the 

 Mexican one now described ; while to the second, besides 

 those mentioned, there should be added the Trinidad species, 

 //. anomaluSj Thomps., and Gray's U. Desmarestianus. 

 Finally, the second new species now described, H. Salvini, 

 forms a third, annectant, group, with the hairy sole of the first 

 and the six pads of the second. 



Heteromys Bulleri^ sp. n. 



Intermediate in size between H. Allem and H. irroratus. 

 General colour above the usual smoky grey, grizzled and 

 lightened with yellowish ; sides with an indistinct yellowish 

 band along the junction of the back and belly colours ; lower 

 surface from mouth to anus pure white ; ears dark, appa- 

 rently not white-edged ; hands and feet white ; arms to elbow 

 also wliite, but on the hind limb the dark colour of the rump 

 passes down to the heel and all round the ankle, but the inner 

 side of the upper leg is white. 



Claws, especially the anterior ones, very long. Soles of 

 hind feet hairy for their posterior half, the hairs pale brownish ; 

 sole-pads five in number ; the hxrge posterior pad circular in 

 outline. Tail rather longer than the head and body, well- 

 haired throughout, clearly bicolor, brown all along its upper 

 surface, white on the sides and below. 



Mammaj 1—2 = 6. 



Skull strong and stoutly built, differing mainly from that 

 of H. Alleni in its much greater size, and from that of 

 H. irroratus by its differently shaped interparietal, which, 

 more like that of H. Alleni^ is comparatively rounded, with 

 its longitudinal 62'5 per cent, of its transverse diameter, and 

 has its anterior edge very convex forwards. 



Teeth much worn in the only specimen, but in their shape 

 and proportions they do not seem to differ from those of 

 H. Alleni. Equally worn teeth of H. irroratus are not avail- 

 able for comparison. 



Dimensions of the type (an adult female in alcohol) : — 



Head and body 114 millim. ; tail 120; hind foot 28*5* 



* Without claw. 



