HETEROMYS. 381 
Honpuras Spiny Mouse. 
Type locality. San Pedro Sula, Honduras. 
Genl. Char. Size medium; tail nearly naked; skull similar to that 
of H. c. setosus, but larger and heavier; roots of zygomata broad; 
hind foot 6-tuberculate. 
Color. Above dark drab brown, grizzled with ferrugineous and 
black; hands, feet, and under parts yellowish white; tail dark above, 
paler below. 
Measurements. Total length, 255; tail vertebre, 126; hind 
foot, 31. 
401. paralius (Heteromys), Elliot, Pub. Field Columb. Mus., 111, 
1903, p. 233. Zodlogy. 
LITTORAL Spiny Mouse. 
Type locality. San Carlos, State of Vera Cruz, Mexico. 
Genl. Char. Similar to H. texensis; size large; tail long, usually 
with a white tip; grayish patch behind ears; ears large; skull with a 
greater occipito-nasal length and wider zygomatic arch; soles 
6-tuberculate. 
Color. Top of head and back behind shoulders blackish brown 
mixed with reddish, the base of hairs grayish; back of ears and sides 
of head and body grayish, with blackish brown hairs intermingled; 
lateral stripe bright buff, extending from nose to thighs; nose and 
upper lip, hands, and feet white; under parts yellowish white; a 
patch of orange buff on each side of root of tail; tail above black, 
beneath whitish, with an all-around white tip. 
Measurements. Total length, 255; tail vertebre, 136; hind foot, 
29. Skull: occipito-nasal length, 33; Hensel, 23; interorbital con- 
striction, 8; zygomatic width, 15; length of nasals, 12; palatal length, 
13; length of upper molar series, 4; length of mandible, 13; length of 
lower molar series, 4. 
C. Xylomys. 
I; P.—; MiS= 20. 
Xylomys Merr., Proc. Biol. Soc. Wash., xv, 1902, p. 43. Type 
Heteromys nelsoni Merriam. 
Pelage without bristles. Skull has small superorbital beads and a 
high and rounded braincase; frontals elongate; maxillary root of 
zygomata large, rectangular; no tubercle over root of lower incisor; 
lower jaw broad, the angle everted slightly; last upper molar with 
two transverse loops and a posterior loop; posterior prism double. 
402. nelsoni (Heteromys), Merr., Proc. Biol. Soc. Wash., xv, 1902, 
Pp. 43. 
