NO. 2057. THE GRASSHOPPER MICE—HOLLISTER. 473 



proper. Skull as in canus, but slightly larger, with larger audita! 

 bullge. 



Color. — Adult in left-over winter coat (93829, Jaumave, TamauHpas, 

 June 3): Most like summer skins of canus, but wdth more pinkish 

 suffusion over entire upperparts, and sides brighter pale pinldsh- 

 cinnamon. Adults in i^rocess of moult (93837, Miquihuana, Tamau- 

 lipas, June S) are frequently very dark; the dark gray underfur 

 is exposed in patches and the light hair tips are almost completely 

 worn or faded away; rusty areas are irregular, from retarded moult 

 or from renewal. Adult in new coat (93839, type Miquihuana, Tamau- 

 lipas, June 8; renewal not complete): Upperparts dark glossy pink- 

 ish-cinnamon, much resembling 0. t. torridus in similar coat, but 

 ear tufts color of head, not white, and tail above much darker brown. 



Slcull. — Like skull of 0. t. canus, but averaging slightly larger, with 

 larger audital bullae. Anterior palatine foramina reaching plane of 

 second cusp of first molars; posterior border of palate usually ending 

 in large spine. (Plate 15.) 



Measurements. — Type and averages of 11 adults from Jaumave 

 and Miquihuana, Tamauhpas, the averages in parentheses: Total 

 length, 163 (155) milhmeters; tail vertebrae, 62 (59.4); hind foot, 

 22.5 (22.1); ear from notch in dry sMn, 16.8 (16.7). Skull: Con- 

 dylobasal length, 25.0 (24.4); zygomatic breadth, 13.6 (13.1); in- 

 terorbital breadth, 4.6 (4.8); breadth of braincase, 11.8 (10.8); 

 length of nasals, 10.3 (10.1); length of mandible, 14.6 (14.0) ^ maxil- 

 lary tooth row, 3.8 (3.9). For detailed measurements of specimens, 

 see page 483. 



Type-specimen. — No. 93839, United States National Museum, Bio- 

 logical Survey collection. Skin and skull of female adult (teeth 

 much worn), rene\ving into fresh pelage. Collected June 8, 1898, by 

 E. W.. Nelson and E. A. Goldman. Original number, 12484. 



Remarlcs. — This is the largest subspecies of Onycliomys torridus. 

 It sUghtly exceeds 0. t. canus in size, with relatively longer tail. In 

 faded summer coat it greatly resembles canus, but is distinguishable 

 by the longer tail and the slight cranial characters. As shown by 

 a single specimen in a more advanced state of renewal than is usual 

 in early summer skins, the fresh coat is much as in true torridus, a 

 rich, dark pinkish-cinnamon. This form seems to be confined to the 

 eastern side of the Mexican table-land, and doubtless intergi-ades 

 directly into true torridus. Like aU the more southern forms it is 

 distinguishable from torridus by its larger size and much larger ears. 



Specimens examined.— Toi&\ number, 17, from locahties as follows: 



CoAHUTLA : La Ventura, 1 . 



Tamaulipas: Jaumave, 5; Miquihuana, 11. 



