280 PROCEEDINGS OF THE ACADEMY OF [1899. 



Urocxjon guatemalce is considerably larger, while the audital bullte- 

 are actually as well as relatively smaller. 



Measurements of skull of ty})e. — Greatest length. 111; basal 

 length, 101; basilar length, 98; palatal length (median), 51.4; 

 nasals (median), 33; zygomatic breadth, 60; interorbital breadthi 

 21.4; breadth across postorbital processes, 33; greatest breadth of 

 brain case, 44; mastoid breadth, 40; greatest depth of brain case, 

 33 ; space between audital bullae, 8 ; upper tooth row (exclusive of 

 incisors), 46; mandible, 81; mandibular tooth row (exclusive of 

 incisors), 51. 



Teeth. — The teeth closely resemble those of Urocyon littoralis, 

 but are more robust. This is particularly noticeable in the first 

 molar and the carnassial, the crown of the latter is nearly a milli- 

 metre shorter and broader than in U. littoralis. All the teeth are 

 larger than in U. parvidens, though they are of essentially the 

 same form. 



Measurements. — Type: total length, 830; tail vertebrae, 327; 

 hind foot, 128. Average of four specimens from near type local- 

 ity (including type): total length, 827; tail vertebrse, 328; hind 

 foot, 120. A specimen from Tumbala, Chiapas: total length, 

 786; tail vertebrc% 300; hind foot, 111. 



Specimens examined. — Ten, from the following localities: Guate- 

 mala— Nenton, 3; Jacaltenango, 1; exact locality unknown, 5; 

 Chiapas — Tumbala, 1. 



General remarks. — jNIexico north of the Isthmus of Tehuautepec 

 is inhabited by gray foxes of large size and pale color, which 

 resemble Urocyon cinereoargenteus scottii Mearns. These animals 

 are replaced south of the Isthmus by U. fraterculus and U. parvi- 

 dens in the arid tropical region of Yucatan, and by U. guatemalce 

 in the humid tropical region of Guatemala. [.. 



