PHYLLOSCOPUS COLLYBITA. 89 
of April. I have killed it in my garden at Gibraltar, and 
some remain during the nesting-season in the Cork-wood; 
but I have not observed it in vrinter, and I was unable to 
notice the date of its departure south. 
The nest is not lined with feathers, like those of P. rufus and 
P. trochilus, and is always placed on the ground. 
The bird is easily distinguished by the streak of bright 
yellow over the eye, and the white colour of the underparts, 
and is also the largest species of the genus which occurs near 
Gibraltar. 
96. Phylloscopus TROCHILUS (Linn.). The Willow -Warbler. 
Moorish. Simriz. 
"The most common of Willow- Wrens near Tangier; crosses 
the Straits in April, returning in November." — Favier. 
There is no doubt, although I did not find a nest, that this 
species nests near Tangier. In the vicinity of Gibraltar they 
. are to be found throughout the year in the Cork- wood, where 
they breed. I have seen the young able to fly on the 8th of 
May. Although universally distributed in winter, they are 
most common on passage in March and October. 
97. Phylloscopus Bonellii, Vieillot. Bonelli^s Willow- 
Warbler. 
" Found during migration near Tangier, in company with 
P. rufus and P. trochilus, but is not so numerous. They return 
in September.'^ — Favier. 
This species, about the size of the ChiflF-chafl", is found in 
plenty near Gibraltar, nesting in the fern in the Cork- wood ; 
the earliest I noticed arriving was on the 1st of April. It is 
easily recognized as a species by the white of the underparts, 
by the yellow shade on the rump, and by the white streak 
from the angle of the beak to the eye over the ear-coverts. 
Furthermore it never occurs in the winter months. 
98. Phylloscopus collybita (V.). The Chifi'-chaff. 
According to Favier this bird is nearly as common as P. 
trochilus, crossing to Europe in February, March, and April, 
returning in October and November. 
