326 BIRDS OF BRITISH GUIANA. 



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

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

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

 sides of I'ody, under tail-coverts, asillaries, and under wing- 

 coverts pure white; abdomen white, faintly lined with dark sha It- 

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

 blackish brown. 



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

 tarsus 11. 



The bird described was collected on the Abarj River in 

 November 190G. 



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

 Wing 110 mm. 



Breeding-season. Unknown in British Guiana. 



If est. Unrecorded in British Guiana. 



Eggs. Undescribed from British Guiana. 



Range in British Guiana. Ituribisi lliver, Supenaam River 

 Bartica, Abary River, Great Falls Demerara River, Arawai 

 TiiYev (McConnell coUecfio/i); Kamakusa and Bartica ( TI7a7fc'/^) ; 

 Aremu River and Abary Savannas {Beehe). 



Extraliinital Range. Cayenne (^Boddaert) ,V>v^z\\, Peru, Ecuador, 

 (/olombia. 



Habits. Schomburgk remarks (Reis. Guian. iii. p. G72) that 

 this beautiful Swallow is met with in thousands near waterfalls 

 and whirl[)Ools, where they perch on the leafless branches of 

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



