CAT.UAJdi'K Ob' BIHUS. 193 



its small size enabling it to escape observation unless 

 closely searched for. 



I have particularly noticed that these birds, during 

 the winter and early spring, appear to have a regular 

 course that they pursue from day to day ; having fre- 

 quently timed them arriving in certain trees from the 

 same direction almost to the minute, and after remain- 

 ing their usual time among the branches, departing, 

 if undisturbed, in the very line they had taken the 

 previous day. 



The male and female were obtained near Plumpton, 

 in April, 1866, the young being taken from a pear-tree 

 in a garden at Uckfield, in Sussex, in June 1872. 



GREEN WOODPECKER.— (Mature.) 

 Case 253. 

 The present species is the commonest of our British 

 Woodpeckers, being abundant in most wooded districts 

 in the southern and midland counties of England. It, 

 however, becomes scarcer towards the north, and I have 

 never met with it in Scotland. 



The specimens in the case were shot in Balcombe 

 Forest, in Sussex, in June 1875. 



SANDWICH TERN.— (Mature and Immature.— 



Autumn.) 

 Case 254. 



The old birds and their young are frequently noticed 

 during autumn, in considerable parties, fishing along 

 the coast of the Firth of Forth. 



They also occasionally make their appearance at 

 this season all round our shores. 



By October they usually begin to make their way 



