STERCORARIUS. 



97 



Total length -417 mtn., exposed portion of culmen 34, wing 3-43, 

 tail 132, tarsus 55, middle toe and claw 51. 



The above description is taken from an example obtained in the 

 harbour at Georgetown. 



Breeding-season. Unknown in British Guiana. 



Nest. Unrecorded in British Guiana. 



Eggs. Undescribed from British Guiana. 



Fig. 24.— To show the hooked hill. 



Fig. 25. — To illustrate the shape of the tail of S. pomariiuis. 



Range in British Guiana. Georgetown Harbour {McConnell 

 collection^. 



Extralimital Range. Arctic Regions. 



Tiiis appears to be the first record of the occurrence of this 

 species in Briti.sh Guiana. 



