58 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I50 



species is found in both the Caribbean and the Pacific adjacent to 

 the shores, the two oceans are inhabited by subspecies distinct from 

 one another in characters of color. 



SDXA LEUCOGASTER LEUCOGASTER (Boddaert) 

 Pelecanus Leucogaster Boddaert, Tabl. Planch. Enlum., 1783, p. 57. (Cayenne.) 



Characters. — In this race the adults, male and female, are similar 

 in color. The female differs from that of S. I. etesiaca of the Pacific 

 side in having the back, wings, and tail paler brown than the head, 

 neck, and chest. 



Iris grayish white ; bare skin around eye dull gray, except for the 

 eyelids which are blue; gular pouch, bare skin of forehead and 

 around gape, yellow; base of bill yellow, changing to pale dull 

 grayish brown at tip; tarsus, toes, and webs yellow; claws dull 

 neutral gray. 



Measurements (from Murphy, Oceanic Birds S. Amer., 1936, p. 

 854).— Males (13 specimens), wing 372-391 (381), tail 169-198 

 (186), exposed culmen 87.8-101.0 (92.7), tarsus 42.0-48.4 (44.3) 

 mm. 



Females (10 specimens), wing 384-415 (400), tail 162-198 (180), 

 exposed culmen 91.8-102.0 (96.3), tarsus 45-48 (46.8) mm. 



Resident. Fairly common along the Caribbean coast. 



The known breeding colonies in Panama are on the following 

 offshore islands: Swan Key, off Boca del Drago, and islets off the 

 western end of Isla Escudo de Veraguas, Bocas del Toro ; Farallon 

 Sucio, off Punta Cacique, between Portobelo and Nombre de Dios, 

 Colon. There is also a breeding colony on Isla Tonel, Colombia, 

 located on the western side of the entrance to the Gulf of Uraba, 

 a few miles beyond the eastern boundary of the Comarca de San 

 Bias. The eggs are like those of Sula I. etesiaca. 



Downy young of good size were noted March 1, 1958, on the 

 islets at Escudo de Veraguas. Though the birds wander to some 

 extent, and so are seen occasionally off Colon harbor, and elsewhere, 

 they are found more frequently near their nesting colonies. They are 

 common in Almirante Bay and at sea off Boca del Drago. 



SULA LEUCOGASTER ETESIACA Thayer and Bangs 



Sula etesiaca Thayer and Bangs, Bull. Mus. Comp. Zool., vol. 46, June 1905, 

 p. 92. (Gorgona Island, Colombia.) 



Characters. — Male strikingly different from that oi S.l. leucogaster, 

 as the forepart of the head is distinctly gray. Female similar to 



