296 HODOMYS. 
59. Hodomys. 
fe 7 M.: 10. 
1 I ; 5 
Hodomys Merr., Proc. Acad. Nat. Scien. Phil., 1894, p. 232. Type 
Neotoma allent Merriam. 
Cranium long, narrow; squamosal and supraoccipital articulating; 
bulla small, narrow anteriorly, shorter than molar series; pterygoid 
fossa longer than broad; basioccipital broad; spheno-palatine vacui- 
ties closed; mandible broadly expanded posteriorly; first and second 
upper molars with four roots each, and the enamel fold on inner side 
divides the middle transverse loop; three roots on third upper molar; 
third lower molar with two salient and one reéntrant angle on each 
side, and with or without an antero-external vertical sulcus. 
Fig. 50. HODOMYS ALLENI. 
No. So21 Field Columbian Mus, Coll. Nat, size 
