156 Dr. Horsfield's Systematic Arrangement 



Spec. 2. Motacilla flam Linn.* 

 Bessit Javanis. 



Gen. 20. Sylvia Latham. 



Spec. 1. Sylvia Javanica mihi. 



S. olivaceo-viridis, capite plumbeo griseo, fronte gulaque tenui- 



ter fulvescentibus, superciliis albidis, abdomine olivaceo-flavo. 



Opior-opior Javanis. 



Longitudo 4^ poll. 



Species S. Hippolai affinis. Remiges et rectrices externe oliva- 

 ceo-viridi marginatae. Axillae albidae. Humeri subtus flaves- 

 centes. 



Spec. 2. Sylvia montana mihi. 



S. olivaceo-fuscescens, alis caudaque pallide fuscis, subtus fus- 



cescente testacea. 



Chret Javanis* 



Longitudo 4| poll. 



* This bird belongs to Budytes, one of the subdivisions or sub-genera, formed by the 

 celebrated Cuvier, of the genus Motacilla of Linnaeus. In this instance I have, agree- 

 ably to the advice of this great naturalist, preserved the name of the genus (" le substan- 

 tif du grand genre, Regne Animal, preface, p. 17)> although in some cases, following 

 the example of Temminck and others, I have employed the sub-genera of M. Cuvier as 

 distinct genera. 



A comparison of Motacilla flaxa with Motacilla speciosa exhibits some remarkable 

 differences, which it may be proper to point out. As the former species is sufficiently 

 known, I shall notice chiefly the characters of the latter. In this the bill is long, broad at 

 the base, then suddenly compressed and attenuated or tapering almost equally to a point, 

 which is abruptly curved. The bill is thus much more compressed laterally than in 

 Motacilla fiaxa ; it has a rounded back, the terminal notch is more obvious, and the 

 point is proportionally blunt. The groove containing the nares is more depressed, and 

 the membrane covering the superior portion is larger and more prominent. In Mota- 

 cilla jlava the claw of the posterior toe is slender and greatly elongate, as in Larks ; in 

 Motdcilta speciosa it is robust, short and curved as in Thrushes : the tarsi of the latter 

 aie also blender and elevated, and it has a forked tail. 



Rostrum 



