to the Ornithology of Egypt. 295 
small numbers during the spring migration. 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.). 
Phyllopneuste trochilus Shelley, p. 103. 
The Willow-Wren arrives in September, but only remains a 
short time, its winter-quarters evidently being further south. 
Very few reappear during the spring migration in March and 
April. 
I have not yet met with the northern subspecies P. trochilus 
eversmnnni (Bp.). 
41. Phylloscopus rufus rufus. 
Phyllopneuste rufa Shelley, p. 102. 
Tne Chilfchaff arrives during September and spends the 
winter 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 Chiffchaff s have a moult of the contour feathers in 
spring, but 1 have not as yet been able to ascertain whether 
this is restricted to yonng birds of the previous year or not. 
The first arrivals in autumn of this species are usually 
adult birds in full winter plumage. 
42. Phylloscopus rufus, subsp. ? 
? Phylloscopus collybita ahietina Hartert, Vog. d. pal. Fauna, 
Heft iv. p. 503. 
This northern 99 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 
eversmunni ) 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 Chiffchaff and many other Warblers 
may be heard in song, but this seems to be restricted to adult birds. 
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