Vol. XXIV, pp. 253-254 December 23, 1911 



PROCEEDINGS 



OF THE 



BIOLOGICAL SOCIETY OF WASHINGTON 



A NEW JUMPING-MOUSE FROM NEW MEXICO. 



BY GERRIT S. MILLER, JR. 

 [By permission of the Secretary of the Smithsonian Institution.] 



In 1858 a specimen of Zapus was collected by Dr. Anderson 

 at Fort Burgwyn, New Mexico. It was entered in the catalogs 

 of the U. S. National Museum on October 22 of the same year. 

 Coues does not mention this skin in his monogra ph of the genus,* 

 but Preble f refers it to Zap us princeps Allen. In both color 

 and cranial characters, however, it differs widely from Zapus 

 princeps and approaches the Californian Z. alleni Elliot. On 

 examining the specimens of Zapus in the Biological Survey 

 collection I find six representatives of the same species, collected 

 in New Mexico since the publication of Preble's revision. As 

 these are in better condition than the original specimen one of 

 them has been taken as type of the long overlooked form. 



Zapus luteus sp. nov. 



Type.— Adult female (skin and skull) No. 133,601, V. S. National 

 .Museum (Biological Survey Collection). Collected at Espauola, New 

 Mexico, June _4, 1904, by M. Surber. Original number, L62. 



Characters. — Resembling Zapus trinotatus alleni (Elliot); ground color 

 of upperparts brighter and more ochraceous I less buffy); dark dorsal area 

 much less evident, usually, in adults, passing insensibly into color of 

 sides, without the line of demarcation nearly always well defined in alh ni : 

 skull smaller and more slender but without special peculiarities of form, 

 the antorbital foramen, as in alleni, relatively larger than in princeps : 

 teeth without evident peculiarities, but anterior surface of incisors darker 

 in color. 



Measurements. — Type: head and body, 86; tail, 138; hind foot (dry), 

 33 ; condylobasal length of skull in type and in adult male ( No. 133,604) 

 from type locality (both with much worn teeth), 21.2 and 21.0 (22.0 and 



•Monogr. X. Amer. Rodentia, pp. 461-479. 1877. 



t Xorth Amer. Fauna . Xo. 15, p. 23. August 8, 1899. 



50-Proc. Biol. SOC. Wash., Vol.. XXIV, 1911. 



