192 



eye-lids red ; the head is black ; the back and wings 

 pale lead or ash colour ; the neck, tail, and under 

 parts are pure white ; the quills vary black, white, 

 or ash colour ; the legs are red. 



The female lays 3 or 4 olive-brown eggs, blotched 

 with rusty red. 



In th 7th vol. of Lin. Trans, is a paper on the 

 changes which this gull undergoes. 



5. RISSA. \KITTIWAKE, OR AN- 



TRIDACTYLUS, Syn. } NETT. 



L. dor so canescente, reclricibus albis, digito postico 

 mutico. Lath. 



The bill is greenish yellow ; inside of the mouth 

 and edges of the eye-lids are orange ; irides dark ; 

 the head, neck, and under parts, together with the 

 tail, pure white ; the back and wings are lead colour, 

 tips of the quills are black; the legs are dusky, 

 having a small protuberance instead of a black toe. 



The female lays 2 dingy greenish eggs, spotted 

 with brown. 



6. CATARRACTES. SKUA, OR BROWN GULL. 



L. grisescens, remigibus rectricibusque basi albis, 

 cauda subceguali. Lath. 



The bill is strong, much hooked, and sharp at the 



