14 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 60 



being" at the expense of the maxilla? which are correspondingly 

 reduced ; sphenopalatine vacuities larger ; vertical arm of maxilla 

 between jugal and antorbital vacuity broader ; audital bullse smaller. 

 Compared with that of D. p. yucatanica the skull has posteriorly 

 broader premaxillge, larger sphenopalatine vacuities and much 

 smaller audital bullse. 



Measurements. — Type: Total length, 492 millimeters; tail verte- 

 bra, 30; hind foot, 120. An adult female topotype: 565; 27; 124. 

 Skull (type): Greatest length, 102.8; condylobasal length, 95.2; 

 zygomatic breadth, 48.2 ; nasals, 38.5 ; interorbital breadth, 28.5 ; 

 palatal length, 52; maxillary toothrow, 19.5. 



Remarks. — An arm of the general range of the D. punctata group 

 extends northward near the Pacific coast, and along the west slope 

 of the high mountains of the interior, to southern Chiapas, Mexico. 

 The specimens from the coastal slope in Chiapas closely approach 

 typical D. p. punctata in color, but depart from it in the well marked 

 cranial details pointed out. In the region of the type locality this 

 agouti ranges in the forest from near sea level to at least 3,500 feet 

 altitude on the western slope of the mountains. 



Specimens examined. — Six, all from Chiapas, Mexico, as follows: 

 Huehuetan (type locality), 4; Chicharras, 2. 



POTOS FLAVUS ISTHMICUS, new subspecies 



Type from near head of Rio Limon (altitude 5,200 feet), Mount 

 Pirri, Eastern Panama. No. 179042, female adult, U. S. National 

 Museum (Biological Survey Collection), collected by E. A. Goldman, 

 April 21, 1912. Original number 21631. 



General characters. — Size and general color of P. f. chiriquensis, 

 but with a distinct black dorsal stripe ; skull with narrow interor- 

 bital region ; dentition heavy as in P. f. chiriquensis, much heavier 

 than in P. f. nieridcnsis and other South American forms. 



Color. — General color of upper parts varying from wood brown to 

 tawny yellow or yellowish tawny slightly darkened by blackish-tipped 

 hairs ; a narrow but distinct black median stripe extending from 

 near shoulders to base of tail ; under parts varying from buff to 

 brownish yellow, becoming abruptly rusty brown on the abdominal 

 and gnlar spots usual in the group; muzzle, ears and toes more or 

 less blackish ; upper side of tail similar to back in color but usually 

 becoming somewhat darker toward tip, the under side paler and 

 more like abdomen. 



Skull. — Similar to that of P. f. cliiriqueusis, but interorbital region 

 narrower, the lateral borders of frontals more concave; postorbital 



