FAMILY JACANIDAE 373 



and under wing coverts, chestnut-brown; primaries and secondaries 

 light greenish yellow, edged with fuscous. 



Immature, crown, back, and tertials brownish gray ; line behind eye, 

 back of neck, and sides black ; rump washed with chestnut ; broad line 

 over eye, side of head, and entire under surface white. 



Iris dark brown; bill yellow, with base of maxilla pale bluish 

 white ; frontal plate orange-yellow to yellow ; tarsi and toes dull gray- 

 ish green ; wing spur bright yellow. 



Measurements. — Males (7 from Guatemala, Honduras, El Salva- 

 dor, and Panama), wing 116.2-120.8 (119.4), tail 37.5-43.5 (40.3), 

 bill from nostril 16.8-19.0 (17.9), tarsus 51.0-57.5 (54.6) mm. 



Fig. 63. — Head of northern ja?ana, gallito de ag^a castano, Jacana spinosa 



spinosa. 



Females (7 from Nicaragua and Panama) wing 130.6-136.6 

 (134.6), tail 41.6-46.6 (44.1), bill from nostril 19.0-20.4 (19.5), 

 tarsus 55.0-61.8 (58.7) mm. 



Resident. Common in the tropical zone of western Panama, 

 through the lowlands of Chiriqui to extreme western Veraguas (El 

 Zapotillo) ; wandering casually to the lower subtropical zone (lakes 

 near El Volcan) ; on the Atlantic side from the Rio Sixaola to Almi- 

 rante in Bocas del Toro. 



These brown-backed birds are found in western Chiriqui, and in 

 Bocas del Toro, east to Almirante. They are especially common near 



