P. H. BAHR : THE BLACK-HEADED GULL. 109 



appearing on the crown and forehead. New white 

 feathers were sprouting on the nape and sparsely on the 



13C K tethers ^ N ^ arcumorbital fe ath 



0l<) * ^saffiaPS^^SB=^ appearing 



fearers 



FIG. 4. BLACK-HEADED GULL, NO. 3, ON APRIL 19TH. 



There are only a few worn rami clinging to the calami in the region below the chin as 

 shown. Feathers are now appearing most numerously in the frontal area above 

 the upper mandible. Old black feathers, much worn, still remain on the vertex, 

 interspersed with new ones, which are blackish-brown in colour. 



breast (see Fig. 3). Hereafter new feathers began to 

 appear quickly under the old black feathers of the 



FIG. 5. BLACK-HEADED GULL, NO. 3, ON APRIL 26TH. 



auricular area, and by April 19th the head appeared 

 almost black, save for a white patch above the upper 



