BIRDS. . 21 



not, however, quite so far north, and it seems well estab- 

 lished that the nightingale is gradually extending its range 

 up the vale of York and along the coast. 



Early in the present century Doncaster was regarded by all 

 writers as the most northerly locality which it visited annu- 

 ally, until in 1844 Mr. Thomas Allis showed that it occurred 

 regularly much further north, and in two exceptional in- 

 stances to as high a latitude as five miles north of York. 

 Baldersby and Bagby, which must now be regarded as its 

 northern outposts, are 21 miles N.W. of York, or 15 and 

 20 miles respectively north of the latitude of that city. 



22. Sylvia rufa (Bodd.). Whitethroat. 



Summer visitant, generally distributed, abundant. Arrives 

 late in April, departing in August and September. 



23- Sylvia curruca (.). Lesser Whitethroat. 



Summer visitant, generally distributed, though in varying 

 numbers, and not nearly so abundant as S. rufa. Arrives 

 during the last week of April, and departs in August and 

 September. 



24. Sylvia orphea Temm* Orphean Warbler. 



Accidental visitant from Central and Southern Europe and 

 Northern Africa, of extremely rare occurrence. 



Wetherby, male seen, female shot, July 6, 1848 (Milner, 



Zool, 1849, P- 2 5 8 8). 

 Notton Wood, near Wakefield, a nest with four eggs taken, 



June, 1864 (Harting, Field, April 22, 1871, p. 321). 



25. Sylvia atricapilla (Z.). Blackcap. 



Summer visitant, somewhat irregularly distributed over the 

 county, but not very numerous. Has in several instances 

 occurred in mid- winter. Arrives late in April N % ; 



26. Sylvia salicaria (Z.). Garden Warbler. 



Summer visitant, generally distributed, common. > Arrives 

 early in May, leaving in September. 



27. Sylvia nisoria Btclut. Barred Warbler. 



28. Melizophiius undatus (Bodd.\ Dartford Warbler. 



Casual visitant, observed in one locality only the Rivelin 

 Valley in the extreme south. Here Mr. Charles Dixon, 

 who is well acquainted with the bird, has several times seen 



