1917.] Chapman, DistrihiUion of Bird-life in Colombia. 329 



eastern slope of the Eastern Andes, but also in the Subtropical Zone on the 

 western slope of this range, and on the eastern slope of the Central Andes. 

 Singularly enough its western representative, R. a. abbreviatm, appears to 

 be restricted to the Tropical Zone. 



Near San Agustin,!; LaPalma,3; LaCandela, 1; Andalucia, (5000 ft.), 

 1; Fusugasuga, 1; BuenaVista, 4. 



(1526a) Ramphastos ambiguus abbreviatus Cab. 



B[amphastos] abbreviatus Cab., J. f. O., 1862, p. 334 ("Kustengegend von New 

 Granada, von Porto Cabello"). 



Nine specimens from the Tropical Zone of the Pacific coast of Colombia 

 are smaller with shorter, more vertically compressed bills (in which the ' keel ' 

 of the culmen shows to its base) than specimens from the Bogota region to 

 which, as I have shown above, the name ambiguiis is applicable. This small 

 form ranges from Panama southward through the Tropical Zone of western 

 Colombia and western Ecuador, and doubtless extends eastward through 

 northern Antioquia at least to the Magdalena Valley, though a specimen 

 from Puerto Valdivia on the lower Cauca approaches amhiguus particularly 

 in the size of the bill (see beyond). 



I have seen no specimens from Puerto Cabello, Venezuela whence Ca- 

 banis ^ states his type of abbreviatus came, but his description of this bird 

 seems to indicate that it is a specimen of the small Tropical Zone form of 

 ambigutis, and I, therefore, provisionally accept his name. 



Iguamiando, Choc6, 1 ; No vita, 4; San Jose, 1; Barbacoas, 3. 



1 Cabanis (I. c.) placed Puerto Cabello in New Granada, but for some thirty years that name had 

 not included what is now Venezuela. 



