to the Ornithology of Egypt. 295 



small numbers during the spring migratiou. At present I 

 have only met with it in my garden, where during the 

 month of April in 1907 and 1908 a pair or two frequented 

 a mulberry-tree for several days. 



40. Phylloscopus trochilus (Linn.). 

 Phyllojmeuste trochilus Shelley, p. 103. 



The VVillow-Wren arrives in September, but only remains a 

 short time, its wM"nter-quarters evidently being further south. 

 Very few reappear during the spring migratiou in March atid 

 April. 



I have not yet met with the northern subspeeies P. trochilus 

 eversmanni (Bp.). 



41. Fhylloscopus rufus rupus. 

 Phyltopneuste rufa Shelley, p. 102. 



Tne Chiffchaff arrives during September and spends the 

 Avinter in Giza. I have heard it in song in November, but 

 the majority do not begin singing before February *. By 

 the end of April all have taken their departure. 



Some Chitfchaffs have a moult of the contour feathers in 

 spring, but 1 have not as yet been able to ascertain whether 

 this is restricted to young birds of the previous year or not. 



The first arrivals in autumn of tljis species are usually 

 adult birds in full winter plumage. 



42. Phylloscopus rufus, subsp. ? 



? Phylloscopus collybita abietina Hartert, Vog. d. pal. Fauna, 

 Heft iv. p. 503. 



This "■ northern " form of the Chiffchaff differs from the 

 typical form in its slightly larger size and much whiter under 

 parts ; in this respect it stands in the same relation to 

 the typical bird as the Northern Willow-Wren (P. trochilus 

 eversmanni) does to the Common Willow- Wren (P. trochilus 

 trochilus). This subspecies arrives here in October and 

 remains till March. My attention was first drawn to 

 the bird by its extraordinary call-note, which can only be 



* After the autumn moult the ChiffchatF and many other Warblers 

 may be heard in song, but this seems to be restricted to adult birds. 



x2 



