150 BETTKNTCH'S GUILLEMOT. 



character, sufficient however for the purpose of scientific dis- 

 crimination. Iris, small and dark, the line behind it only 

 extends backwards for an inch. Head, crown, neck on the 

 back and nape, dull black, the very close texture of the 

 feathers giving a peculiar tint to these birds. Chin, dull 

 black, descending on the sides; throat and breast, white; 

 back, dull black. 



Greater and lesser wing coverts, dull black, their outer 

 edges grey; primaries, dull black; secondaries, dull black, 

 their tips white, forming a bar across the wing; tertiaries, 

 dull black. Tail, dull black. Legs and toes, bright coral 

 red; webs, bright coral red. 



The female resembles the male in plumage. 



The figure on the plate is from a drawing by John 

 Gratcombe, Esq., of Plymouth. 



