Il6 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 69 



ment of the premaxillae and in the more massive maxillary arm of 

 the zygoma. Contrasted with H. desmarestianus* panamensis it is 

 somewhat paler in color and the fore feet are white instead of 

 blackish ; the skull differs in detail, the rostrum broadens less abruptly 

 to the zygomata, the interparietal is narrower and the lateral wings 

 of the supraoccipital are broader, more developed over mastoids. 



A single specimen taken by J. H. Batty at Boqueron was recorded 

 by Allen (1904, p. 70) ; the skull of this example exhibits the same 

 shortening of the premaxillae as compared with the nasals, and the 

 interparietal is broad without a posterior emargination, but in the 

 massive maxillary arm of the zygoma approaches that of H. d. zonali-s 

 and suggests intergradation with that subspecies. 



Specimens examined: Boqueron, I 1 ; Boquete, 7 1 (including 

 type). 



HETEROMYS DESMARESTIANUS ZONALIS Goldman 



Canal Zone Spiny Pocket Mouse 



[Plate 25, figs. 3, 3a] 



Heteromys zonalis Goldman, Smiths. Misc. Coll., Vol. 56, No. 36, p. 9, 

 February 19, 1912. Type from Rio Indio, near Gatun, Canal Zone, 

 Panama. 



The Isthmian representative of the H. desmarestianus group is a 

 rather large dark colored animal with the slender hairs inconspicuous 

 among the bristles over the upperparts. Unlike H. desmarestianus 

 panamensis and H. desmarestianus crassirostris, which have ankles 

 dark all around, a white line extends along the inner side of the hind 

 leg to the foot. Although so widely separated geographically this 

 subspecies seems rather more like H. desmarestianus desmarestianus 

 of Guatemala than like the allied forms in Panama. Compared with 

 H. d. desmarestianus and H. d. repens the general color of the upper- 

 parts is darker, the slender hairs projecting beyond the bristles being 

 less ochraceous buffy. 



The Canal Zone pocket mouse inhabits the rocky slopes of low 

 heavily forested hills near the Atlantic coast. Anthony (1916, 

 p. 370) records the species from Maxon Ranch (Rio Trinidad). 



Specimens examined: Gatun, 3; Maxon Ranch (Rio Trinidad), 

 1 *; Rio Indio (near Gatun), 1 (type). 



1 Collection Amer. Mus. Nat. Hist. 



1 Six in collection Mus. Comp. Zool. ; one in Amer. Mus. Nat. Hisi. 



