586 
Mr. J. H. Stenhouse : 
Libis, 
it possible that confusion has arisen in the breeding season 
from the resemblance of the local ChiffchaflPs eggs to those of 
the Willow-Warbler? 
Phylloscopus c. collybita. 2 S ; 4 $ . 
Found all the year round, but much more numerous in 
winter. It breeds in fair numbers in the woods round 
Algeciras and at Almoraima, and from the presence of a pair 
in the Sierra Retin on 24 April, it may be assumed they 
nest there also. During the winter months they are found 
generally distributed both in wooded and in open country. 
During March therg were passage movements, and the 
opinion was formed that the winter visitors then departed. 
Throughout most of the month it was difficult to find these 
birds in the cork-woods behind Algeciras, but at the end of 
the month they were again in evidence, and the song of the 
male, a double note followed by about five descending notes, 
could then be heard. A nest was found partly built on 
19 April about two feet up in a gorse bush. It could not be 
visited till 10 May and then was found in ruins, but the 
domed nest with feather lining and remains of pink-spotted 
eggs sufficiently identified it. A pair was located near, and the 
lien was watched building a new nest in a bramble. A week 
later the hen was shot from the nest, which contained four 
eggs with pink spots closely resembling Willow-Warblers. 
The nest was scantily lined with feathers (seven of which 
were those of the Oriole). These birds are indistinguishable 
from typical collybita. One male from Almoraima lias an 
aberrant wing formula, the second primary being 2 mm. 
longer than the 7th but shorter than the 6th. The song of the 
male seems to change as the summer advances: in June 
‘•'chip chip chip chip ” followed by the descending notes was 
heard, and at times four or five sharp monotones only. The 
typical 66 chip chop 33 of the bird was heard in the Alameda 
Gardens, Gibraltar, on one occasion only, and in January. 
Phylloscopus b. bonelli. 3 $ . 
Breeds in some numbers in Oobre Wood behind Algeciras, 
and abundantly at Almoraima. Nests seen w^ere invariably 
