70 



Pi-of. Blasius on the Ornithologij of Heligoland. 



feather is very little shortened, the others in the Javan species 

 of equal length ; in the Siberian species the two middle feathers 

 are slightly lengthened. The bill is in both species of a dark- 

 blue horn -colour, with yellowish flesh-coloured borders. The 

 feet are in both species bright-coloured — in the Javan brown- 

 ish grey, and in the Siberian bluish green. 

 The measurements are as follows : — 



The measurements given by v. Middendorff perfectly agree 

 with those of the bird from the Sea of Ochotsk, but they differ, 

 particularly in their proportions, from those of the original spe- 

 cimen of the Phtjllopneuste icterina., l^v. = eversman?ii, Bp. 



I must leave it undecided as to which of these species the 

 bird shot at Heligoland belongs; but I hope that Gaetke, to 

 whom I have applied, will favour me either with positive infor- 

 mation upon the matter, or with the bird itself, to make a 

 comparison. On geographical grounds, it may be considered as 

 more probable that the Siberian species immigrates into our 

 latitudes; but nothing can be positively stated on the subject 

 a priori. 



21. Sylvia orpheus, Temm. 



22. Saxicola rufescens (Briss.) : S. aurita, Temm. 



23. Saxicola stapazina, L. 



24. Motacilla yarrellii, Gould. 



25. BuDYTEs ciTREOLA, Pall. — The young birds killed at 

 Heligoland are especially interesting from their colour. 



