J 14 HAPLODONTIA. 



throughout, especially on the under parts and region around mouth; 

 whiskers mainly white, instead of black. (Vide Merriam, 1. c.) 



Measurements. Total length, 375; tail vertebrae, 33; hind foot, 62. 



144. pacifica. {Aplodontia!), Merr. Proc. Biol. Soc. Wash., 1899, 



p. 19. 



Type locality. Newport, Yaquina Bay, Oregon. 



Geogr. Distr. Oregon, limits of range undetermined. 



Genl. Char. Size small; ear long; colors dark. 



Color. Winter Pelage. Above fulvous brown mixed with black; 

 head and rump bister; cheeks suffused with fulvous; under parts 

 plumbeous, washed with fulvous; legs, feet and tail grizzled grayish 

 dusky. 



Afeasiireiiients. Total length, 304; tail vertebrte, 22; hind foot, 48. 



145. phaea. {Aplodontia.'), Merr. Proc. Biol. Soc. Wash., 1899, p. 20. 

 Type locality. Point Reyes, Marin County, California. 



Geogr. Distr. Unknown. 



Genl. Char. Size small; ears short. 



Color. General hue uniform bister brown. 



Measurements. Total length, 330; tail vertebrae, 30; hind foot, 55. 



146. olympica. {Aplodontia.'^, Merr. Proc. Biol. Soc. Wash., 1899, 



p. 20. 



Type locality. Queniult Lake, Olympic Mountains, Washington. 



Geogr. Distr. Olympic Mountains, Washington, range unknown. 



Genl. Char. Similar to ff. rufa but larger and darker. 



Color. Above rufous mixed with black hairs; rump grayish; 

 under parts gray tinged with rufous. Lips white, and some speci- 

 mens have white spots on the chest and behind ears, but in others 

 these are absent. Base of ear blackish. Skull: " Jugal not obliquely 

 expanded but developing a postorbital ridge or process which forms 

 the only upward projection from the arch — the posterior projection 

 in rufa, formed by the thickened anterior end of the squamosal, being 

 absent." (Merr.) This process in a modified form is present in H. 

 r. californica, and is of varying dimensions in a series of IT. olympica: 

 in some being almost obsolete. 



Measurements. Total length, 350; tail vertebrae, 35; hind foot, 35. 



Fam. III. Castoridae. 



Skull massive, no postorbital processes, superior outline nearly 

 straight; molars single rooted with re-entering of enamel folds, and 

 decrease in size posteriorly; the molar series is not parallel but con- 

 verges anteriorly and the palate is arched, contracted anteriorly. 



