FAMILY APODIDAE 



245 



pital at Ancon with the information that he had noted them first in 

 1931. At this same period the birds began to build on the walls of 

 the canal locks and in the control house at Pedro Miguel. In 1936 

 J. A. Griswold, Jr., collected a series of the birds at the Miraflores 

 and Pedro Miguel locks. In Panama, on March 15, 1944, Dr. Clark 



FrouRE 38. — Cayenne swift, vencejo gargantiblanco, Panyptila cayennensis 

 cayennensis. 



showed me a nest pendant from the ceiling of the two-story covered 

 entrance at the Gorgas Memorial Laboratory, a site that has been 

 occupied annually to the date of the present publication. Other nests 

 have been observed on the ruins at Panama Viejo. In March 1949, I 

 saw 1 in a high window embrasure on the end of the church in the 

 plaza in Chepo, where I have recorded it subsequently as still present 

 whenever I have passed that way. The earliest record is by Salvin 



