10 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 60 



General characters. — Similar to A. paca virgata, but general color 

 more rusty or reddish brown ; dark stripe below lower lateral white 

 stripe obsolescent (broad and distinct in virgata) ; pelage longer and 

 denser ; molariform toothrows narrower. Differing from typical 

 A. paca paca in the obliteration of the lower lateral stripes. 



Color. — Ground color of upper parts varying from dark cinnamon 

 rufous to dark chestnut, interrupted along sides by white arranged 

 in narrow stripes or lines of spots ; two lateral white lines begin as 

 rows of spots along sides of neck, become stripes near shoulders, 

 curve downward along lower part of sides, rise again toward hips, 

 and break into spots over sides of rump ; above the upper lateral 

 white stripe and separated from it by a broad dark stripe a line of 

 spots reaches from neck to rump, and above this a shorter parallel 

 row extends along posterior part of back ; lower lateral white stripe 

 bounded below by a narrow and rather indistinct dark line ; a third 

 white stripe, continuous and distinct in A. p. paca, is indicated pos- 

 teriorly near the thigh where it merges with the white of the under 

 parts ; under parts, usually including inner sides of limbs, dull white, 

 cheeks grayish brown ; outer sides of fore limbs pale fawn color ; 

 hind limbs similar to back. 



Skull. — Closely resembling that of A. p. znrgata, but rostrum 

 longer ; frontals more inflated along maxillary borders ; molariform 

 teeth narrower. 



Measurements. — Type : Total length, 794 millimeters ; tail verte- 

 bra, 29; hind foot, 127. Skull (type): Greatest length, 154.8; 

 condylobasal length, 147.5; zygomatic breadth, 11 1.7; interorbital 

 breadth, 43.3; nasals, 55.7; palatal length, 93.7; maxillary toothrow, 

 30; width of crown of second upper molar, 6.5. 



Remarks. — In the Mexican paca the encroachment of the white 

 color of the under parts along the sides and the consequent obliter- 

 ation of stripes, a character separating virgata from typical paca, has 

 proceeded still farther and the dark stripe below the lower of the 

 two lateral white stripes is reduced to a very narrow line, or may 

 be absent entirely. 



Specimens examined. — Total number, 16, from the following 

 localities : 



Vera Cruz: Catemaco (type locality), 5; Chichicaxtle, 1. 



Tabasco: (Exact locality unknown), 1. 



Chiapas: Palenque, 1; Teopisca (20 miles southeast), 1. 



Campeche: Apazote, 1. 



Guatemala: Puerto Barrios, 1 ; exact localities unknown, 4. 



Honduras: San Pedro Sula, 1. 



