PEROMYSCUS. 131 



the collection — 4704, 4705, and 4711. Of these, 4704 is the only one that can 

 be found. The published measurements of 540, both in Baird's Mammals of 

 North America, page 469, and Coues's Monographs of North American Rotlentia, 

 page 7S, more nearly agree with tlie measurements of the original description 

 than the mea^urenients of any of the others do. 



Hesperomys gracilis Lc C'onto. 



Proc. Acad. Nat. Sci. IMiila., VII, p. 442, ordered published at meeting of 

 December 25, 1855. 

 = Peroniyscus gracilis (Le C'onte). 



3 so I'll- Skin and skull. Recoiv(xl troin Major J. E. LeConte, U. 8. A. 

 Date and locality unknown. Skin ratalooned October 15, 1872; 

 ykull, May 26, 1902. 



The skin is in very poor condition. The left hind leg is the only one present. 

 The skull, removed in May, 1902, is somewhat more serviceable. The posterior 

 half of the brain-case has been cut away; the left zygoma is missing. The right 

 half of the mandil)le is perfect, while the ascending portion of the left half is 

 broken off. 



Attached to the specimen are three labels rea<ling as follows: 



(1) "Monograj)li of American IMuridu'. Dr. Elliott Coues, U. S. A. No. 

 10292. Type of lle.sperorniis gr<icil(ti= lenropus.^^ 



(2) "HeKp. '^rrtc/ZiV Le Conte type specimen Wisconsin'.' Ohio? Michigan?" 

 pasted on the reverse side of this label is ^Ujrarilis." 



(3) "Monograph of American Murida?. Dr. Elliott Coues, U. S. A. No. 

 10292. Hesperomys leucopas." 



There is little in the original description to indicate' that this sj^ecimen is the 

 type. The entry in the catalogue for 10292 reads " Dry type of graclUxy 



On page 51, Monographs of North American Rodentia, under the synonomy 

 of Hesperomys leiuopus, Dr. Coues gives ^^ Hesperomys (jracUis, Le Conte, Proc. 

 Acad. Nat. Sci. Phila., VII, 1855, 442 (Ohio or Michigan and Wisconsin; types 



Nos. , 4710, Mus. Smiths.)." The dash may refer to the above specimen; 



the other specimen, 4710, is one not quite so poor. There is nothing about its 

 labels or catalogue entry to indicate that it is a type or cotype. 



Peromyscus gratus Merriani. Biological Survey collection. 



Proc. Biol. Soc. Wash., XII, p. 12S, April oO, 1898. 



5(>)19. Skin and .skull. Adult female. Tlalpain, Federal District, 

 Mexico. November 80, 181>2. Collected by E. W. Nelson. Origi- 

 nal number 3927. 



AVell-made skin in good condition; skull perfect. 



Peromyscus guatemalensis Mcrriain. IVioloojcal Survey collection. 

 Proc. Biol. Soc. Wash., XII, p. 118, April 30, 1898. 



7H8()1. Skin and skull. Adult male. Todos Santos, Guatemala. 

 December 31, 1895. Collected by p:. W. Nelson and E. A. Gold- 

 man. Original number 8991. 



Well-made skin in good condition; skull perfect, except for absence of right 

 coronoid process. 



