SYLVIAD.E. 
107 
11. S. fruticola, Naumanii, (xiii., p. 453.) — Supposed 
to be the young of S. nigrifons, itself a not established 
species. It is with the last evidently a variety of S. 
arunclinacea or S. palustris. 
12. S. ruhricapilla, Landbeck, S. naumanni, Miiller. 
— Has been determined as a species by Muller, Avho 
refers it to the above figure in Nauinann’s work, xiii., 
p. 411. It is distinguished from atricapilla by the male 
having a red head like the female. The species has 
not been satisfactorily determined. 
13. S. ohscurocapilla — Calamoherpe ohsci(,rocapilla,T)\x- 
bois. — Is a species figured, with its nest and eggs, and 
described as new by Dubois, in his beautiful work, 
which he has kindly sent to me, the “Birds of Belgium.” 
It is quite possible that this species will prove distinct, 
though in the absence of specimens for examination I 
do not feel competent to give a stronger opinion. It 
appears to have been first discovered by M. le Vicomte 
de Spoelberg, in 1854. It is, says M. Dubois, closely 
allied to the Marsh Warbler, f S. palustris,) with which 
in fact it has long been confounded. From this however 
it differs in the male having a dark head, which is never 
observed in palustris. It appears to be a great mimic. 
The nest is similar to that of the Garden Warbler in 
form, and of the Grasshopper Warbler in construction. 
14. S. arigonis. Hypolais arigonis, A. Brehm, fils. 
Algemeinen deutsclien naturliistoriscJien Zeitung, No. 
161, p. 467, tome 3. — This is said to be a good species 
by M. Dubois. If it maintains this character I shall 
endeavour to give a notice of it in the Supplement. 
The above include all, I believe, of the real or sup- 
posed and doubtful species, which have been thought 
by various authors to have had more or less claim to 
admission into the European list of birds. 
