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



is enough seasonal variation to require the use of wholly comparable ma- 

 terial in reaching valid conclusions concerning the relationships of speci- 

 mens from areas of intergradation. Fortunately we are provided with 

 typical seasonally comparable series of both forms, but the determinations 

 made with this material produce results which, taken literally, might be 

 most misleading. Thus we have specimens referable to oequalis from 

 Dabeiba, Puerto Valdivia and Rio Frio in the Cauca Valley; while specimens 

 referable to uropygialis were taken at La Frijolera, Barro Blanco, Salento, 

 and Rio Toche. The fact that all the specimens of wqualis are from the 

 Tropical Zone while all those of uropygialis are from the Subtropical Zone 

 may have some significance, though I am at a loss to understand why in 

 this area of intergradation uropygialis should be a subtropical species while 

 in the region where it is most typically developed it is found only in the 

 tropics. All our specimens of oequalis, on the other hand are from the 

 Tropical Zone. 



Possibly the fact that all our Subtropical Zone specimens of uropygialis 

 or ijjtergrades which are nearer that form, are non-breeding birds taken in 

 October and November, may indicate that they are migrants from the 

 Pacific coast region. The question can be decided only by further field 

 work and comparison of breeding birds from all the areas concerned. Mean- 

 while I list our specimens, according to their apparent identity. 



Dabeiba (int.), 1; Puerto Valdivia (int.), 1; Rio Frio, Cauca Valley, 1; 

 Calamar, 1 ; Varrud, 1 ; Banco, 3 ; Puerto Berrio, 3 ; Malena, 1 > Chicoral 

 (int.), 1; Andalucia (w. slope 3000 ft.), 1; Villavicencio, 1. 



(3349) Stelgidopteryx ruficoUis uropygialis (Lawr.). 



Coiyle uropygialis Lawb., Ibis, 1863, p. .181 (Panama). 



Cotyle flavigastra Cass., Proc. Acad. N. S. Phila., 1860, p. 133 (R. Truando). 



Stelgidopteryx ruficoUis uropygialis Hellm., P. Z. S., 1911, p. 1093 (Sipi). 



As might be expected, this is the form of S. ruficollis which occurs on 

 the Pacific coast region of Colombia and Ecuador, from which it has al- 

 ready been recorded by others; but it is somewhat surprising to find one 

 of these richly colored forms which characterize the Pacific lowland, ex- 

 tending its range into the Subtropical Zone of the Central as well as Western 

 Andes. A specimen from Salento and two from Rio Toche, all taken in 

 October, three from Barro Blanco (November), and one from La Frijolera 

 (January) are much nearer to uropygialis than to oequalis and are therefore 

 listed under that race. Whether they are migrants or merely intergrades 

 from a general area of intergradation I am unable to say. (See also re- 

 marks under preceding race). 



