NO. 2057. THE GRASSHOPPER MICE—HOLLISTER. 469 



EemarJcs. — This well-marked subspecies is the darkest of the races 

 of torridus found in the United States. It intergrades directly wdth 

 pulcher in the west end of San Gorgonio Pass. The specimens from 

 Tia Juana River and Tecarte Valley show an approach in size to 

 0. t. macrotis of Lower California peninsula. 



Specimens examined. — Total number, 60, from localities as follows: 



California: Banner, 1 (Univ. of Calif.); Burbank, 1; Dulzura, 2 

 (Phila. Acad. Sci.); Ferndale, San Bernardino County, 2 (Mus. Comp. 

 ZooL); Jacumba, 3; La Puerta Valley, 1 (Univ. of Calif.); mouth 

 of Tia Juana River, 5; Pasadena, 1 (Univ. of Calif.); Reche Canyon, 

 4; Riverside, 9; San Bernardino Valley, 15 (including the type and 

 paratypes, Phila. Acad. Sci.); San Diego, 1; San Fernando, 1; San 

 Jacinto Lake, 1; Santee Mountains, 3; Tujunga Valley, 1 (Univ. of 

 Calif.); Valle Vista, San Jacinto Valley, 4 (Univ. of. Calif.); Warner 

 Pass, 2 (Univ. of Calif.). 



Lower California: Tecarte Valley, 3. 



ONYCHOMYS TORRIDUS MACROTIS EUlot. 



1903. Onychomys macrotis Elliot, Field Col. Mus., pub. 74, zool. ser., vol. 3, 

 No. 10, p. 155. April. 



Type-locality. — Head of San Antonio River, west slope of San Pedro 

 Martir Mountains, Lower California, Mexico. 



Geographic distribution. — From the San Pedro Martir and southern 

 Hanson Laguna Mountains west to the Pacific coast. Lower Cali- 

 fornia, Mexico. 



General clmracters. — Like Onychomys torridus ramona but larger, 

 with longer tail and hind foot, and especially larger ears. 



Color. — Not distinguishable from that of Onychomys torridus 

 ramona. 



STcull. — The skull of macrotis is like that of 0. t. ramona, but larger. 

 (Plate 15.) 



Measurements. — Type and an adult female from San Quintin, Lower 

 California, the latter in parentheses: Total length, 155 (148) milli- 

 meters; tail vertebrae, 55 (54); hind foot, 21 (22); ear from notch in 

 dry skin, 16.7 (16.8). Skull: Condylobasal length, 24.3 (24.7) 

 zygomatic breadth, 13.3 (13.5); interorbital breadth, 4.9 (5.0) 

 breadth of braincase, 11.7 (11.8); length of nasals, 10.3 (10.1) 

 length of mandible, 14.1 (14.2); maxillary tooth row, 3.7 (3.7). 

 Average external measurements of eight specimens from San Quin- 

 tin, compared with averages of eight skms of ramona, the latter in 

 parentheses: Tail vertebrae, 52.4 (47.0); hind foot, 21.1 (20.1); ear 

 irom notch in dry skin, 16.6 (14.5). 



Type-specimen. — No. 10283, Field Museum of Natural History, 

 Chicago. Skin and skull of female adult (teeth considerably worn). 

 Collected March 11, 1902, by Edmund Heller. 



RemarJcs. — The recorded measurements give little idea of the great 

 size of the ear as compared with that of ramona. Except for increase 



