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AllCTIC SKUA. 
The following are the stages of this species figured in the Plates, together with the dates on which they 
were obtained : — 
Plate I. A young bird of the year, shot September 28th, 1874, in Aberlady Bay in the Pirth of Forth. 
Plate II. Intermediate stages of dark and light form (probably in the third or fourth year, judging from 
the changes exhibited by Pomatorhine Skuas kept in confinement), shot September 16th, 1874, between the 
islands of Fidra and Ebris in the Firth of Forth. 
Plate III. Adult male (light form) and female (dark form), obtained at their nesting-quarters in Caithness, 
May 31st, 1869. 
Plate IV. Two adult females, shot in the Firth of Forth on August 28th and 29th, 1874. 
