Migratory Birds in British Guiana. 261 



migration that seem more removed from any satisfa6lory 

 explanation than they have been for many long years. 



Here in British Guiana, chances of adding materially 

 to our knowledge of migration can scarcely be said to 

 exist. Very many species of migrants do pass south- 

 wards along our coasts, while certain others are only 

 known from the highlands of the interior ; but the 

 opportunities of making detailed and exa6l records are 

 by no means satisfa6lory. Owing to the vast tra6ls 

 of country that are entirely unexplored, undeveloped 

 and unsettled, huge areas, along which migration may 

 take place, are entirely unknown and unrecorded ; while 

 even where migratory birds may be noted in the in- 

 terior, the want generally of sufficient knowledge on the 

 part of the observers would lead rather to confusion than 

 to the explanation of the problems to be solved. 



Many of our resident species occur as migrants in the 

 United States, ranging to Texas and Florida, and even 

 further north ; but it is at present impossible to say 

 definitely how far south these migrants travel. The 

 American Warblers are specially to be noted. In the 

 case of one of these (Dendrceca xstiva) , the Summer 

 Yellow-bird of the United States, locally passing under 

 the general name of " Canary," the individuals are cer- 

 tainly much more numerous here during the times of 

 migration, most probably indicating that birds from the 

 northern distri6ls had arrived. This species occurs 

 commonly along the coast being very plentiful in George- 

 town during the autumn and winter months f but it may 

 well be that other species occur in the forest distri6ls and 

 on the open plains and mountains of the interior. 



The Black Poll Warbler (D. striata) of the United 



