558 BIRDS OF THE REPUBLIC OF PANAMA PART 3 



las Perlas. As explained above, with the larger series now available 

 this supposed race has proved invalid. In darker dorsal coloration the 

 Coiba series differs from that of mainland Panama and resembles 

 the average of the northern race Elaenia flavogaster subpagana found 

 from southern Costa Rica north to Mexico. The Coiba birds there- 

 fore are listed under this name. It should be noted, however, that the 

 16 specimens available from the island are uniformly darker gray on 

 upper breast, foreneck, and side of the head, while only part of the 

 mainland series equal them in depth of these markings. 



For comparison, measurements of the mainland population are 

 given. 



Males (10 from Mexico, Guatemala, Honduras, Nicaragua, and 

 Costa Rica), wing 76.3-82.3 (79.6), tail 69.1-74.0 (71.8), culmen 

 from base 12.2-14.5 (13.6), tarsus 18.9-19.8 (19.4) mm. 



Females (10 from the same area), wing 73.3-78.7 (76.2), tail 

 64.7-71.6 (67.5), culmen from base 12.5-13.6 (13.0), tarsus 18.9- 

 19.9 (19.3) mm. 



ELAENIA FLAVOGASTER PALLIDIDORSALIS Aldrich 



Elaenia flavogastra pallididorsalis Aldrich, Sclent. Publ. Cleveland Mus. Nat. 



Hist., vol. 7, August 31, 1937, p. 106. (Paracote, Mouth of Rio Angulo, 



Golfo de Montijo, Veraguas, Panama.) 

 Elaenia flavogastcr silz'icultrix Wetmore, Proc. Biol. Soc. Washington, vol. 59, 



March 11, 1946, p. 51. (Isla San Jose, Archipielago de las Perlas, Panama.) 

 Elaenia flavogaster cristula Wetmore, Smithsonian Misc. Coll., vol. 121, no. 2, 



December 2, 1952, p. 22. (Isla Taboga, Panama.) 



Characters. — Paler, more greenish olive above, somewhat brighter 

 yellow on abdomen. 



A male, taken March 5, 1961, at the Candelaria Hydrographic 

 Station on the Rio Pequeni, above Madden Lake, had the iris light 

 wood brown ; maxilla and tip of mandible fuscous-black ; base of man- 

 dible brownish white ; tarsus and toes dusky neutral gray ; claws 

 black. A female at El Llano, Panama, February 3, 1962, had the iris 

 dark wood brown ; base of maxilla fuscous, changing to fuscous- 

 black at tip; tip of mandible also fuscous-black, with the base dull 

 brownish white ; tarsus, toes, and claws black. In another female at 

 Aguadulce, Code, January 17, 1963. the iris was dark reddish brown; 

 tip of bill, including maxilla and mandible, fuscous-black; base of 

 maxilla dark mouse brown, that of mandible dull pinkish flesh color ; 

 back of tarsus at upper end neutral gray ; the front and lower part, 

 toes and claws black. 



Measurements. — Males (10 from Chiriqui, Veraguas, Los Santos, 



