92 INTRODUCTION. 



is, has not yet received much attention ; so that, in occasionally 

 presenting local lists of species, accompanied by explanatory 

 remarks on the nature of the districts, I shall not be unneces- 

 sarily extending my observations ; and the general results, to 

 be presented at the conclusion of my labours, will, I trust, 

 prove of considerable interest. 



In the meantime, it may be mentioned that the number of 

 species hitherto observed in Britain amounts to about two hun- 

 dred and ninety-five. Of these about a hundred and twenty-five 

 reside in the country throughout the year ; sixty visit us in 

 summer, and depart in autumn ; thirty are winter visitants ; 

 and the rest, about eighty, may be included in the class of 

 straoforlers, or accidental, or irreofular visitants. Besides these, 

 a species, formerly plentiful in certain districts, the Great 

 Wood Grouse, Tetrao Urogallus, has been extirpated ; and 

 the same may be said of the Crane, Grus cinerea^ of which one 

 or two individuals only have been seen of late years. 



