132 THE ZOOLOGIST. 



flocks of Terns off Donna Nook. Almost all appeared to belong 

 to this species, but possibly there were a few Common Terns 

 among them. 



Larus argentatus, Gmel. Herring-Gull. — On Aug. 31st 

 flocks of Herring-Gulls in V-formation were passing S. all day 

 over Grainsby. They were flying at a great height, and calling 

 incessantly. On Sept. 1st they were still passing, but in smaller 

 numbers. On Sept. 3rd I noticed that Herring-Gulls were very 

 scarce on the coast, but the Great Black-backed Gulls were pre- 

 sent by thousands, quite nine out of ten being adult birds. 



Megalestris catarrhactes (Linn.). Great Skua. — On Sept. 21st 

 I saw a very large dark-coloured Skua off Donna Nook, which 

 probably belonged to this species. 



Stercorarius pomatorhinus (Temm.). Pomatorhine Skua. — 

 A beautiful adult bird of this species was shot in a drain near 

 the coast at Tetney by one of the Plover-catchers on Sept. 4th. 



S. crepidatus (Gmel.). Arctic Skua. — I saw the first of 

 these birds on Sept. 3rd. On 6th there was an adult of the 

 white-breasted form, and, lastly, a single bird on 27th. 



Podicipes fluviatilis (Tunst.). Little Grebe. — First appeared 

 on the coast on Sept. 25th at North Cotes, a single bird in full 

 summer plumage. It was rather numerous during the winter on 

 the brooks and marsh-drains. 



