1906.] i \ lien, Mammals from Western Mexico . 239 



Tuxpan, and in the Sierra de Colima, near the Colima boundary, from 

 June 24 to October 2, where about 554 specimens of mammals were 

 collected. The whole number of mammals from Jalisco included in 

 this report therefore numbers altogether about 1,400 specimens, 

 representing 48 species, of which 2 are herein described as new. 

 Further collections, not yet received, were made by him in southern 

 Jalisco before his departure to the State of Oaxaca, where he is con- 

 tinuing his work. 1 



The absence from this collection of specimens of Oryzomys and 

 Ncotoma, while Sigmodon, Pcromyscns, Reithrodontomys , Heteromys, 

 and Pcrogncithns are well represented, is noteworthy, and not easily 

 explained, except on the ground of their probable absence at the 

 particular localities where the trapping of small mammals was vigor- 

 ously prosecuted. The genus Pcromyscus is represented by 5 species 

 and over 250 specimens; Sigmodon by 2 species and over 60 specimens, 

 Reithrodontomys by 2 species and 41 specimens, Microtus by 17 

 specimens, and Hcteromys by about 80 specimens. Oryzomys and 

 Xcotonia would have hardly escaped the traps had they been present. 



Only one representative of the Geomyidse was taken namely, 

 Platygeomys gymnurus (52 specimens) and this only in the vicinity 

 of Zapotlan (the type locality), although Mr. Batty was urged to give 

 special attention to this group. He reports that he tried to obtain 

 them at various points, and observed at a few localities old 'signs' of 

 what appeared to be extinct colonies. The only place where he saw 

 fresh indications of their presence was where he found the large colony 

 of Platygeomys. From other localities, in Durango and Lower Cali- 

 fornia, he has sent large series of both Thomomys and Neotoma, especi- 

 ally of the latter, so that their absence from the Jalisco collections is 

 the more surprising. 



i. Marmosa sinaloae Allen. 



One specimen, Rancho Palo Amarillo, near Amatlan de Canas, 

 Tepic, Jan. 15. 



2. Didelphis mesamericana mesamericana (Okcn). 

 Ten specimens, all adult: Estancia, 6 specimens, Jan. 22, 26, 



1 Since the manuscript of this paper was sent to the printer, another collection has been received 

 irom Mr. Batty, containing about 120 specimens of mammals obtained at Los Masos (altitude 

 5800 feet) in southern Jalisco, and collected between October 5, 1905, and February 16, 1906. 

 These add several species to the list, and are now included in order to complete the account of the 

 Jalisco- collections. Unfortunately Mr. Batty's notebook covering this period of his work has not 

 yet been received, so that measurements and dates of collecting are not available for record. This 

 later material raises the total number of Jalisco specimens to about 1520, and the number of species 

 to 60. 



