NOVITATES ZOOLOGIOAB XXVII. 1920. 463 



(? t) 579. Phylloscopus sibilatiiz eriangeri Hart. = Phylloscopus sibilatrix 



erlangeri (or flavescens). 

 Phylloscopus sibilatrix flavescens Erlanger, Jowm. f. Om. 1899. p. 254. pi. v. (Tunisia). 

 Phylloscopus sibilatrix erlangeri Hartert, Vog. pal. Fauna, i. p. 516 (1909 — " Scheint die Mittelmeer- 

 lander zu bewohnen, und zwar Siid-Frankreioh, Spauien, Sardinien, Dalmatieu bis Serbien,- 

 und vennutlich Marokko, Tunis und Algier "). 



Type : c? ad., Orange. Wood in the Mehuila, on the Dum-er-Rebia, east of 

 Mazagan, West Marocco, 8.iv.l901. Ernst Hartert leg. 



It is doubtful if this name is valid. I named these paler, more yellowish 

 birds erlangeri, because there was already a Sylvia flavescens and Phyllopneuste 

 flavescens of Gray, but there is no Phylloscopus flavescens. I am afraid, therefore, 

 that I wrongly interpreted the Rules of Nomenclature, and that the name 

 flavescens may be used. Moreover, I do not any longer believe that any sibilatrix 

 breeds in Africa, but consider flavescens (or erlangeri) a South European form, 

 merely differing very slightly by being more yellowish from P. sibilatrix sibilatrix. 



Of. NOVITATBS ZOOLOGICAE, XX. p. 49 (1913). 



580. Phylloscopus borealis ezaminandus Stres. = Phylloscopus borealis 



examinandus. 



Phylloscopus borealis examinandus Stresemann, Nov. Zool. xx. p. 353 (1913 — Bali, Sumbawa, Flores, 

 Alor, and Stuuba, in winter !). 



Type : (J ad., Bali, iii. 1896. William Doherty leg. 



This apparent subspecies is so far only known in winter quarters, on the 

 Lesser Sunda Islands to Alor, east of Bali. Observations in the breeding places 

 will have to confirm this form before it can be said to be finally established, but 

 it seems to be different. 



581. Phylloscopus collybita exsul Hart. = Phylloscopus collybita exsul. 

 Phylloscopus collybita exsul Hartert, Vog. pal. Fauna, i. p. 505 (1907 — ^Lanzarote). 

 Type: (J ad., Lanzarote, 22.xii.1903. Polatzek leg. No. 2,223. 



582. Sylvia deserticola maroccana Hart. = Sylvia deserticola maroccana. 

 Sylvia deserticola maroccana Hartert, Bull. B.O. Club, xxxviii. p. 6 (1917 — ^Western Atlas, in Marocco). 



Type : c? ad., Seksawa, Western Atlas, Marocco, 27 . iii. 1906. F. W. Riggen- 

 bach leg. No. 1,730. 



This is one of the most interesting discoveries of Mr. Riggenbach in Marocco. 

 The ".typical " S. deserticola deserticola, as we now well know, nests in the southern 

 or Saharan Atlas Ranges and mountains of the Haux Plateaux (near Batna, 

 Djelfa, etc.), in Algeria and Tunisia. Of 8. d. maroccana Riggenbach only sent 

 one male, but its differences are beautifully confirmed by a specimen collected 

 by Mr. Meade-Waldo near Tsauritz Entsagauz, where it was common. 



583. Sylvia undata toni Hart. = Sylvia undata toni. 



Sylvia undata toni Hartert, Vog. pal. Fauna, i. p. 602. 



Type : (J ad., south of Biskra, S. Algeria, 14. i. 1903. Ernst Fluckiger leg. 

 No. 327. 



