FAMILY HIRUNDINIDAE 



9 



February 14, 1966, the iris was dark brown, bill black, tarsus and toes 

 fuscous-brown; claws black. A third, from the second locality, March 

 9, 1966, had the tarsus, toes, and claws black. In this third bird the 

 tongue was flesh color, and the lining inside the mouth was black. 



Measurements. — Males ( 10 from Panama) , wing 93.4-101.1 (96.8), 

 tail 39.6-42.2 (40.8), oilmen from base 9.9-11.8 (11.2), tarsus 9.5- 

 10.8 (11.2) mm. 



Females (10 from Panama), wing 92.2-98.2 (94.7), tail 39.8-46.8 

 (42.0), culmen from base 10.0-11.6 (10.8), tarsus 10.1-11.5 (10.7) 

 mm. 



Figure 1. — Mangrove Swallow, Golondrina Manglera, Tachycineta albilinea. 



Resident. Common throughout the lowlands, mainly along the 

 larger rivers and over open water around the coastal mangrove swamps; 

 seen regularly along the Panama Canal, on Gatun Lake, and in bays on 

 the coasts, usually near the mouths of the rivers. Rare in the highlands. 



Recorded on Islas Verde and Cebaco in Golfo de Montijo; Isla Coiba. 



From January to May these small swallows are seen in pairs or little 

 groups; in the second half of the year they sometimes gather in larger 

 groups of 50 or more. They range over open water along the larger 

 streams, often resting on fallen branches or logs stranded in the water. 

 A few may be seen flying along beaches or over pastures and other 



