PROGNE. 343 



Total length 170 mm., exposed culmen 11, wing 134, tail 65, 

 tarsus 14. 



The description of the male is taken from an example collected 

 on the Ituribisi River in November 1906. 



Adult female. Similar to the adult male, but differs in being 

 smaller in wing-measurement and in having a line of dark feathers 

 on the middle of the lower breast and abdomen. Wing 125 mm. 



The female described above was also collected on the Ituribisi 

 River in August 1909. 



Breeding-season. Unknown in British Guiana, 



Nest. Unrecorded in British Guiana. 



Eggs. Undescribed from British Guiana. 



Range in British Guiana. Ituribisi River {McConnell col- 

 lection) ; Corentyn River {British Museum). 



Extralimital Range. Brazil, Venezuela, Colombia, Peru, Bolivia, 

 Argentina. 



Habits. Schomburgk states (Reis. Guian. iii. p. 672) that he 

 found this bird in large numbers near the waterfalls and whirl- 

 pools of the Essequibo River, where they usually rest on the 

 leafless branches of the tall trees on the banks. Sometimes 

 solitary birds would leave the nest, fly round, and settle again, 

 when all of a sudden the whole flock would fly about for some 

 time and again return to its resting place. Its nidiflcation was 

 not known to him. 



