276 Bulletin American Museum of Natural History. [Vol. XXXVI, 



(959) Antrostomus rosenbergi {Hart). 



Ca-primulgus rosenbergi Hart., Bull. B. O. C, V, 1895, p. 10, (R. Dagua, w. Col.). 



A pair taken by Richardson at Barbacoas agrees with Hartert's descrip- 

 tion. The male has the scapulars, lower breast and abdomen more heavily 

 barred than the female. On the abdomen of the latter there appears a 

 faint suggestion of the white spotting which is so marked a character of A. 

 occellatus. 



Barbacoas, 2. 



Family CYPSELIDiE. Swifts. 



(968a) Streptoprocne zonaris altissima Chapm. 



Streptoprocne zonaris altissima Chapm., BuU. A. M. N. H., XXXIII, 1914, p. 604 

 (Laguneta, Col.). 



Char, suhsp. — Agreeing in size with S. z. zonaris of southern Brazil, but bill 

 heavier, the ridge of the culmen more prominent, general color, particularly of the 

 inner wing-quills and wing-coverts greener, forehead averaging paler, the breast- 

 band broader with the terminal half, rather than the terminal third, of its feathers 

 white, the edge of the wing, as far as the primary coverts and some of the lesser 

 coverts, distinctly margined with white; differs more pronouncedly from S. z. 

 alUcincta in the characters named, and in its larger size. 



The discovery that even birds of such exceptional power of flight as the 

 large Swifts, may have representative forms in zones separated by a few 

 thousand feet, is one of the most interesting results of our studies of zonal 

 distribution in Colombia. Streptoprocne zonaris albicincta is distributed 

 throughout the Tropical Zone of Colombia and ascends to at least the lower 

 border of the Subtropical Zone. The form here described, however, we have 

 taken in Colombia only at Laguneta, in the Temperate Zone (one specimen) 

 and on Mt. Pichincha, Ecuador (3 specimens). The differences between 

 altissima and albicincta are more striking than those which exist between 

 zonaris and albicincta. There is no indication of intergradation among our 

 twenty Colombian and Ecuadorian specimens of both forms, and it is not 

 probable, in my opinion, that albicincta and altissima intergrade inter se, 

 but that their connectant is true zonaris. The intergradation of altissima 

 with zonaris may reasonably be looked for, at some point where increasing 

 south latitude brings the Temperate Zone to the altitude at which zonaris 

 occurs, let us say northwestern Argentina, while the intergradation of al- 

 bicincta with zonaris may be looked for in that region south of the Amazon, 

 where the Amazonian forests merge into, or interdigitate, with the highlands 

 of southern Brazil. 



Laguneta, 1. 



