FAMILY TROCHILIDAE 371 



chin and side of head dull black ; gorget metallic red, bordered below 

 by a band of white across lower f oreneck and upper breast ; rest of 

 breast gray; center of abdomen white; under tail coverts white, 

 tipped with gray ; sides dull iridescent green ; a white spot on either 

 side of rump. 



Adult female, and immature, above metallic bronze-green; central 

 rectrices like back; others dull black, the two or three outermost 

 tipped with white ; wings dull grayish brown to dusky, faintly 

 glossed with purple ; edge of wing grayish white ; a small white spot 

 behind eye ; side of head dull gray ; lores dusky ; under surface grayish 

 white; tibial tufts and one on either side of rump white; flanks more 

 or less brownish buff. 



Immature male, with throat finely spotted with dusky. 



Measurements. — (From Ridgway, U. S. Nat. Mus. Bull. 50, pt. 5, 

 1911, p. 629) males, wing 37.0-40.0 (38.5), tail 25.5-28.5 (27.0), 

 exposed culmen 15.0-17.0 (15.9) mm. 



Females, wing 43.5-45.5 (44.5), tail 25.0-26.5 (25.6), exposed 

 culmen 17.0-19.5 (18.2) mm. 



Weight, 2 males, 3.0, 3.4 grams; 3 females 3.05, 3.4, 3.63 grams 

 (Hartman, Auk, 1954, p. 468.) 



Migrant from the north. Apparently uncommon ; recorded on the 

 Pacific slope in western Panama. 



The ruby-throated hummingbird of eastern North America comes 

 regularly south to western Costa Rica, but there are few records 

 for Panama. Salvin (Proc. Zool. Soc. London, 1870, p. 208) re- 

 ceived an adult male, and 3 females from Arce, taken on the southern 

 slope of the volcano in western Chiriqui. The male now is in the 

 British Museum, and 1 of the females is in the U. S. National 

 Museum. The others seem to have disappeared. 



Dr. Eugene Eisenmann informs me that on November 25, 1962, 

 he saw 4 or 5 at Playa Coronado, in the western sector of the 

 Province of Panama, among them an adult male, and an immature 

 bird of the same sex with some iridescent feathers appearing on 

 the throat. These are the only records available. 



In late October and early November 1940, I found these humming- 

 birds common near Liberia, Guanacaste, in northwestern Costa Rica. 

 Here they fed at flowers in an area where thickets and woodland 

 alternated with pastures. It is probable that those that reach 

 Panama may range in similar territory, where they may be expected 

 from late October to April. 



