1904.] Allen, Mammals from Tropical America. 3 1 



221-240 (av. 233); tail vertebrae, 110-121 (av. 118); hind 

 foot, 20.7. 



11. Oryzomys jalapae rufinus Merriam. One adult male, 

 April 9. Total length, 260; tail, 140.5; hind foot, 20.9. 



12. Sigmodon toltecus (Saussure). Four specimens, April 

 5- J 3- 



13. Liomys pictus rostratus Merriam. Twelve specimens, 

 March and April. Five adult males: Total length, 257 (250- 

 260); tail vertebras, 130 (123-140); hind foot, 29.6 (29-30). 



14. Lepus (Sylvilagus) russatus, sp. nov. 



FIGURES i, 4, AND 7. 



Type, No. 17203, $ ad., Pasa Nueva, Vera Cruz, Mexico, April 10, 

 1901; A. E. Colburn. 



Pelage coarse and harsh. General coloration above, including upper 

 surface of head, whole dorsal region, and upper surface of tail, pale 

 brownish russet, varied with dark brown; sides and hips varied with 

 creamy white; nape patch, anterior surface of fore limbs, and outer 

 surface of hind limbs, f errugineous ; cheeks and sides of neck like back 

 but strongly varied with black; ventral surface yellowish white, the 

 darker color of the sides encroaching on the sides of the abdomen; 

 prepectoral band clay color ; upper surface of hind feet creamy white ; 

 ears externally grayish brown, slightly tinged with pale rusty, and 

 gradually darkening on the apical third to blackish. 



Measurements. Total length, 450; tail vertebrae, 42; hind foot, 

 80; ear from crown (in dry skin), 62. Skull, occipito-nasal length, 

 78.5; basal length (inner base of incisors to posterior border of oc- 

 cipital condyles), 63; greatest zygomatic breadth, 35.2; interorbital 

 breadth, 17; mas toid breadth, 28; width of braincase, 25; length of 

 nasals, 36; width at posterior border, 17; length of palatal bridge, 

 7.5 (10 to tip of frontal spine) ; length of malar, 33.5; upper toothrow 

 (crown surface), 6.5; palatal foramina, 19, by 7 at posterior border; 

 length of lower jaw (front base of incisors to angle), 55; height at 

 condyle, 35. 



The skull is narrow for its length; the occipital portion only mod- 

 erately depressed, audital bullae very large for the size of the skull, 

 nearly twice as large as in skulls of Lepus aztecus of practically the 

 same size. 



Lepus russatus is distinguished from its nearest geographical 

 allies, L. aztecus (Figs. 2, 5, 8) and vera-crucis , by the russet 



