888 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. XXVI. 



LUTREOLA MACRODON, new species. 



Type specimen.— "^o. 115178, United States National Museum col 

 lected by R W. True and D. W. Prentiss in 1897. 

 Type locality.—Y^YooXsXm, Hancock County, Maine. 

 Condition of 25y^^. -Fragment (.f skull composed" of the superior 

 maxilhe, portions of the nasals, right zygoma, and palate extendino- 

 b nun. back of molars. All of the teeth are present on the right side" 

 three incisors and one premolar on the left side. The teeth are in 

 excellent condition except the canine, which is broken at the point and 

 portions of enamel missing. The bones are very brittle and of a'yel- 

 lowish color on their broken surfaces. 



Descrlptloa.-^o^mn very wide, nasal aperture large, ant-orbital 

 toramina also large. The nasals ascend more abruptly than in L n\on 

 liitreocephakis, its nearest relative. The dentition i.^ very similar to 

 this race • the principal differences being the large size of teeth and 

 the more acute angle which the carnassial makes with the long axis of 

 the skull. ^ 



Meamirements. 



Incisor row 



Premolar row at base! ! .' '. 

 Palate between canines . 

 Palate between molars . 



^'^^^'^^s^^^'!^'!i^^^^'^'^o^^v-^t};i 



Between ant-orbital foramina 

 Breadth of nasal apertnre 



Ant-orbital foramen 



Base of incisor row to tip of liasai 



Lutreola 



viacrodon. 



Type. 



Mm. 



8.25 



18. 25 



9.00 



12.50 



30.00 

 22. 00 

 9.25 

 6x4 

 14. 25 



L. vison 



ingens. 



Type.ra 



Mm. 



7.5 

 17.7 



9.00 

 12.00 



28.00 

 20.00 

 7.5 

 5x3 

 13.25 



L. rinov 

 Intrean [tjm. 

 Im. 36915 

 U.S.N. M.'' 



Mm. 



6.75 

 14.50 



8.00 

 11.00 



26.00 



18. 00 



8.00 



4.X3 



13.00 



"Fort Yukon, Alaska. 



6 Near Washington, District of Columbia. 



The skulls from which the foregoing measurements were taken are 

 adult. Ihe measurements of L. macrodon, compared with those of 

 L V. hUreocephcdus, its nearest relative, show the enormous size of 



K^,hT. ". f; "■ ^'^r'T' ""''^'^ "^^ ^^'^ I'^^-S-^^^ American mink, 

 but L. decidedly smaller than the one here described. 



stHl in T'rl^^'T. "'' '^"' '^^'^' '" ^' '■ ^^^treocephalu. is very 

 tnk ing, but the difference in size of the teeth, the angle of the nasals! 

 and the position of the carnassials justify me, I belie, e, in the abs 



of intermediate forms, in describing it 

 I wish to express my thanks to the 



)sence 



as a new species. 

 Insfifnfu.n +■ ' • ■ ^^^ Secretary of the Smithsonian 



D H .^V'''"""'^"" '" """^^ ^^"^ ^-^P^^'t "P«^^ ti^i« 'Specimen, to 



LJi. C. Halt Merriam tor access to the coWections of the Biolooical 

 Survey, Department of Agriculture; to Mr. G ^^o'o^'^al 



to Mr. Outran! Ikngs, of Boston. 



Gerrit S. Miller, jr.; and 



