Abstract
A bird migration study was conducted by Florida State University during portions of the years 1967 and 1968 in the western part of the Republic of Panama. A total of 3,896 wild birds were banded between September and October 1967 at the Gorgas Memorial Laboratory's field station at Almirante (A), Bocas del Toro province, situated at sea level near the Caribbean coast in a tropical rain forest. Another 874 birds were banded from September to December 1967 and in March of 1968 at the Florida Audubon Society's field station at Cerro Punta (CP) situated at an altitude of 5,500 ft in the tropical cloud forest of Chiriqui province. Small nodular lesions resembling the tumours of avian pox virus, studied at the same locations (Kirmse and Loftin, 1969, Bulletin of the Wildlife Disease Association 5: 103-107), were found xclusively on the base of the lower mandible, the chin, or throat of the birds. They appeared as single subcutaneous cysts ranging in size from a pinhead to a cherry. They were easily removed through a small incision in the skin. Healing was promoted after application of tetracycline powder and birds from which lesions had surgically been removed showed no further sign of infestation when retrapped. On dissection the cysts contained a viscous yellowish-brown liquid in wh ch oval-shaped yellowish mature flukes were detecte , in numbers ranging from 1 to 8 specimens (mean 3.3) and measuring in diameter from 0.5 to 2.0 mm.
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