189 

 6. HIRUNDO. 



HIRUNDO. ") 



NJEVIA, Syn. GREAT TERN > OR SEA ' 

 OBSCURA. 5 SWALLOW - 



S. cauda forficata rectricibus dudbus extimis albo 

 nigroqm dimidiatis. Lath. 



The bill and feet are crimson; the crown and 

 tip of the bill black ; plumage above grey, beneath 

 white. 



Weight 4oz. length 14 inches. 



The female lays 3 or 4 dull olive eggs, marked 

 with black spots at the thicker end. 



GENUS LV. 



LARUS. 



Bill straight, sharp and edged, hooked at the end, 

 a knob on the lower mandible ; nostrils are narrow, 

 placed in the middle of the bill ; feet webbed. 



1. MARINUS. BLACK-BACKED GULL, OR GREAT 

 BLACK AND WHITE GULL. 



Z, cdbus, dor so nigro. Lath. 



The bill is pale yellow, strong, with a red spot 

 and a black centre on the lower mandible j the irides 



