THE BIRDS OF ALGERIA. 69 



305. THE WESTERN OLIVACEOUS WARBLER Hypo- 

 lais opaca (Lichtenstein), is a resident in Algeria, 

 its numbers being increased in winter. I shot two 

 examples in the oasis of Biskra. 



306. THE OLIVACEOUS WARBLER Hypolais pallida 

 (Ehrenberg), is a resident in Algeria, resorting in 

 winter to the southern oases. 



307. THE RUFOUS WARBLER s/edon galactodes 

 (Temminck), appears to be a resident in Algeria. 

 I only met with this species in the oases of El 

 Kantara and Biskra, where it frequented the Arab 

 gardens, and was very fond of perching on the mud 

 wells and flicking its tail in a very peculiar manner. 



308. BONELLI'S WILLOW WARBLER Phylloscopus 

 bonelli (Vieiliot), is a resident in Algeria, frequenting 

 the mountain forests and the Tell in summer, and 

 retiring to the oases in winter. Its numbers are 

 also increased at the latter season by migrants from 

 Europe. 



309. THE WOOD WREN Phylloscopus sibilatrix 

 (Bechstein), is a winter visitor to Algeria, but 

 remains to breed in small numbers in the mountain 

 forests of the Atlas. 



310. THE WILLOW WREN Phylloscopus trochilus 

 (Linnaeus), is a very common winter visitor to 

 Algeria, frequenting the oases in enormous numbers. 



