FAMILY TROGONIDAE 419 



Panama. The northern populations of this trogon from Mexico 

 through Panama agree in having the crown and usually the nape 

 black, though occasional individuals have the feathers of the back 

 of the head tipped with blue. The birds of Colombia and Venezuela 

 normally have the nape and the back of the pileum dark blue, with 

 this color extending forward to the level of the center of the eyes. 

 Rarely one from this area lacks this blue coloration or has it some- 

 what reduced. Some that I have collected in the eastern Province of 

 Panama ( Chimin ), eastern Darien (Jaque), and San Bias (Man- 

 dinga) appear slightly intermediate as they show the bluish tipping 

 on the posterior part of the crown (behind the eyes) and the nape 

 described above. The bird from Perme, examined through the 

 courtesy of Dr. Raymond Paynter, Jr., is of this intermediate group. 

 We have typical examples of caligatus from Nazaret and Tierra 

 Alta, on the lower Rio Sinu in the Department of Cordoba (formerly 

 a part of Bolivar) in northwestern Colombia. De Schauensee (Cal- 

 dasia, vol. 5, no. 23, 1949, p. 595) included concinnus tentatively 

 from the Tropical Zone of the Pacific coast of that country, and 

 later (Birds Colombia, 1964, p. 165) listed it definitely from that 

 area. It seems probable that complete intergradation between the 

 two forms takes place in northwestern Colombia. On present in- 

 formation the single intermediate specimen from Perme does not 

 justify the inclusion of T. v. caligatus in the list of forms of Panama. 



