HYDROCHCERUS. 109 



stripes on flanks; rows of white spots on sides of neck, becoming stripes 

 on shoulders extending to hips and breaking again into spots on sides 

 of rump; on flanks are two stripes, a dark and white one, and above 

 the former a row of white spots go from neck to rump ; a shorter row 

 of similar spots extends along lower part of back; an indistinct dark 

 line extends below the lower white lateral line, and an indistinct white 

 line goes from the thighs to underparts; underparts and inner side 

 of limbs white; cheeks grayish brown; outer side of fore limbs pale 

 fawn; outer side of hind limbs dark cinnamon-rufous. Ex type in 

 United States National Museum. 



Measurements. Total length, 794; tail, 29; hind foot, 127. 

 Skull: Occipito-nasal length, 147.5; Hensel, 127.5; zygomatic width, 

 111.7; intertemporal width, 43.3; length of nasals, 55.7; palatal 

 length, 93.7; length of upper molar series, 30; length of mandible, 

 79.5; length of lower molar series, 29.6. Ex type in United States 

 National Museum. 



Genus Hydrochcerus. 



Hydrochcerus Brisson, Regnum Anim., 1762, p. 80. Type Sus 

 hydrochceris Linn. 



Hydrochcerus isthmius Goldman. 



Hydrochosrus isthmius Goldm., Smith. Misc. Coll., LX, No. 2, 1912, 

 p. n. 



Type locality. Marraganti, near the head of tide-water on the 

 Rio Tuyra, eastern Panama. 



Genl. Char. Similar to H. hydrochceris but smaller; cranial char- 

 acters different; dentition lighter. 



Color. General color on upper and underparts deep rusty reddish, 

 the color darker on upperparts, the hairs on underparts being scanty, 

 not covering all the skin; middle of face, cheeks, lower part of rump 

 and outer side of hind legs inclining to blackish; orbital rings buffy; 

 ears and feet brownish black, nearly bare of hairs. Ex type in United 

 States National Museum. 



Measurements. Total length, 1025; hind foot, 200. Skull: 

 Greatest length, 200; occipito-nasal length, 174; zygomatic width, 

 116.5; interorbital width, 52.5; length of nasals, median, 67.6; pala- 

 tal length, 122; length of tooth row, 64.2; length of mandible, 

 157; length of lower tooth row, 61. Ex type in United States National 

 Museum. 



