HETEROMYS. 381 



HONDURAS 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 vertebrae, 126; hind 

 foot, 31. 



401. paralius (Hcteromys), Elliot, Pub. Field Columb. Mus., in, 



1903, p. 233. Zoology. 

 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 vertebrae, 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. 



0. Xylomys. 

 T -'. p !=! M 3=3 20 



1 'i-i' r 'i-i' M '3-3~ 



Xylomys Merr., Proc. Biol. Soc. Wash., xv, 1902, p. 43. Type 



Heteromys nclsoni 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, 



P- 43- 



