580 Mr. J. H. Stenliouse : [Ibis, 



it possible that confusion has arisen in the breeding season 

 from the resenihlance of the local ChiflfchafF's eggs to those of 

 tlie Willow-Warbler? 



Phylloscopus c. collybita. 2 J ; 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 ai-e found 

 generally distributed both in wooded and in open country. 

 During March there were passage movements, and the 

 opinion was formed that the winter visitors then departed. 

 Throughout most of the month it was difHcult 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 bo 

 visited till 10 May and then was found in ruins, but the 

 domed nest with feather lining and remains of pink-spotted 

 eo-D-s sufficiently identified it. A pair was located near, and the 

 lien was watched building a new nest in a braml)le. A week 

 later the hen was shot from the nest, which cuutained four 

 eggs with pink spots closely resembling AVil low- Warblers. 

 The nest w-as scantily lined with feathers (seven of which 

 were those of the Oriole). These birds are indistinguishable 

 from tjpical coUi/b'ita. 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 "chip chop" of the bird was heard in the Alameda 

 Gardens, Gibraltar, on one occasion only, and in January. 



Phylloscopus b. bonelli. 3 S • 



Breeds in some numbers in (*obre Wood behind Algeciras, 

 and abundantly at Almoraima, Nests seen were invariably 



