582 Mr. J. H. Stenhoiise : [Ibis, 



Lanius s. senator. 2 J" ; 1 ? juv. 



First observed in 1919 on ■! April and in 1920 on 2 April, 

 after which dates the birds became numerous. A belated 

 migrant was seen at Gibraltar on 23 May (the wind had been 

 strong easterly for two days). They begin to nest soon after 

 arrival ; a full clutch of six egos was found in the Sierra 

 Retin on 4 May. In autumn none were seen after 17 

 September. 



Sylvia c. communis. 2 J ; 1 ? 



Common on migration ; not found breeding near Algeciras, 

 but nests at Almoraima. First seen 27 March ; a male 

 struck the lantern at Europa 29 March. Many passed 

 during April. The first evidence of autumn migration was 

 on 19 August, when one was found dead at Gibraltar under 

 the telegraph wires ; last was seen on 22 October. 



Sylvia simplex. 1 ? . 



Seen only on passage. First noted 11 April ; a female 

 struck the Europa lantern on 30th of that month. In autumn 

 observed on passage 17 September. 



Sylvia a. atricapilla. 2 ? . 



Resident. Numbers are greatly increased during 

 migration. In spring they began to pass through on 25 

 February, both sexes travelling together, and passage con- 

 tinued throuohout March. Autunui mio-ration was difficult 

 to observe, but was in full swing in the middle of September 

 and continued durino- October. Males struck the aerials on 

 9 October and 22 October. It was heard in song at Gibraltar 

 on 8 January. 



Sylvia m. melanocephala. 4 J* ; 2 ? . 



Resident and common. Breeds early. Noted building on 

 2G February ; first egg laid 9 March. A nest watched had 

 first egg laid 2<i March : incubation period 13 to 14 days ; 

 tledgling period 11 da3'S. Nestlings examined had no down ; 

 inside of mouth orange : flanges pale yellow. The pair were 

 building their second nest on 23 May : it contained three 

 eggs on 31 May. 



