242 PHILOSOPHY OF ZOOLOGY. 



2. JBiil subulate, slender, slightly depressed at the base. 

 Bill a little enlarged at the base. Legs long. 



80. SAXICOLA. Motadlla rubicola. 



81. SYLVIA. Motacilla plwenicurus- These two ge- 

 nera depend on the difference in size of the enlargement at 

 the base of the bill, which is greatest in the first. 



Bill slender throughout. 

 Claw of the hind-toe produced. 



8%. ANTHUS. The species of this genus were formerly 

 confounded w iththe larks. Alauda pratensis. 



Hind claw common. 



Tail and scapulars produced. The former frequently in 

 motion. 



83. MOTACILLA. Wagtail. Hind toe curved. Mota- 

 cilla alba. 



84. BERDYTES. Hind toe nearly straight. Motacilla 

 flava. 



Tail and scapulars common. 



Bill approaching to concave at the sides. 



85. REGULUS. Bill straight. Motacilla rcgulus. 



86. TROGLODYTES. Bill slightly bent. Motacilla tro- 

 glodytes. 



Bill uniformly conical at the sides. 



CUKRUCA. Nightingale. In this genus there is a slight 

 compression at the tip of the bill, and the upper ridge is a 

 little arched. Motacilla luscina. 



87. ACCENTOR. Edges of the bill inflected. Motacil- 

 la modularis. 



(6.) Bill destitute of the terminal notch. This character, 

 in point of fact, is not absolutely negative, there being few 

 birds of this, or any of the divisions in which vestiges of a 



