326 BIRDS or BRITISH GUIANA. 



head mark of steel-blue at the tips ; flight-quills steel-blue with 

 dull black inner webs ; tail similar, with white at the base on 

 the lateral feathers ; ■ cheeks, throat, sides of neck, breast, 

 sides of body, under tail-coverts, axillaries, and under wing- 

 coverts pure white ; abdomen white, faintly lined with dark shaft- 

 streaks; under surface of flight-quills and lower aspect of tail 

 blackish brown. 



Total length 124 mm., exposed culmen 11, wing 108, tail 43, 

 tarsus 11. 



The bird described was collected on the Abary River in 

 November 1906. 



Adult female. Similar to the adult male, but rather smaller. 

 Wing 110 mm. 



Breeding-season. Unknown in British Guiana. 



Nest. Unrecorded in British Guiana. 



Eggs. Undescribed from British Guiana. 



Range in British Guiana. Ituribisi River, Supenaam River 

 Bartica, Abary River, Great -Falls Demerara River, Arawai 

 River {McConnell collection); Kamakusa and Bartica ( TF/tiieZy) ; 

 Aremu River and Abary Savannas [Beehe). 



Extralimital Range. Cayenne (Boddaert) , Brazil, Peru, Ecuador, 

 Colombia. 



Habits. Schomburgk remarks (Reis. Guian. iii, p. 672) that 

 this beautiful Swallow is met with in thousands near waterfalls 

 and whirlpools, where they perch on the leafless branches of 

 trees which had fallen into the river. He did not find it nesting. 



