478 bulletin: museum of comparative zoology. 



Fitzinger (1867, p. 397) applies to the feral Pampean Dog the Latin 

 combination " Canis domesiicus, pyrcnaicus alco" (!) and briefly states 

 that it is probably a hybrid between the Pyrenian Dog and the Bull- 

 dog. Hamilton Smith (1840) had previously described it under the 

 Latin name Canis campivagus. 



As to the origin of the Patagonian Dog, there is little satisfactory 

 evidence, but it may be assumed to be a derivative of the same stock 

 as the Inca Dog. The tooth measurements of the skull recorded by 

 von Ihering (1913), cf. p. 477, accord very nearly with those of the 

 largest Inca Dog of our table (p. 473), though even larger. 



Mexican Hairless Dog; Xoloitzcuintli. 

 Plate 2; Plate 3, %. 2. 



1651. Lupus mexicanus Recchi and Lynceus, Rerum medicarum Novae 



Hispaniae thesaurus, p. 479, fig. 

 1766. Canis 7nexica7ius Linne, Syst. nat., ed. 12, 1, pt. 1, p. 60, (based on 



Recchi and Lynceus). 

 1788. Canis familiaris aegyptius GmeUn, Linne's Syst. nat., ed. 13, 1, pt. 1, 



p. 68 (in part). 

 Canis familiaris orthoius xoloitzcuintli Reichenbach, Naturg. raubth., 



p. 150. 

 1821. Canis nudxis Schinz, Cuv. thierreichs, 1, p. 218. 

 1827. Canis familiaris caraibaeus Lesson, Man. mammalogie, p. 163. 

 1844. Canis caraibicus Tschudi, Fauna Peruana, Therologie, p. 249. 

 1887. Dysodus gibbus Cope, Amer. nat., 21, p. 1126. 



Characters. — A dog of medium-size, rather heavily built, and 

 long-bodied in proportion to its height; ears large and erect; tail 

 thick, drooping or carried nearly straight behind; hair nearly absent 

 except for a few coarse vibrissae and generally a sparse coating on the 

 tail, particularly near the tip; sometimes a tuft on the crown. The 

 skin is usually pigmented, a slaty gray, or reddish gray, paler in 

 the bends of the legs; sometimes blotched with wdiite. 



Distribution. — This race seems to have been native among the 

 peoples of Central and South America from Chihuahua perhaps con- 

 tinuously southward, to the Peruvian lowlands, and in some of the 

 Greater Antilles; it may also have been indigenous among the In- 

 dians of Paraguay. 



History.^ The first account of the Mexican Hairless Dog by a 



