MOTACILLID Al. 151 
Motacilla. 
Tail longer than the wings; hind claw comparatively short, 
and considerably curved. Feathers of back without lighter 
edges ; no spots nor streaks on breast. Tail doubly forked, or 
the central feathers nearly equal to the lateral, and longer 
than intermediate ones. Tip of wing formed by outer three 
primaries ; the distance between the 3d and4th about one- 
third that between the 4th and 5th. Tarsi lengthened ; 
claw small; hind toe and claw shorter than the middle, its 
claw short, considerably curved, less than the toe alone; 
lateral toes nearly equal. : : . : : . Motacilla. 
Anthus. 
Tail decidedly shorter than the wings; less than half the whole 
length of bird; simply emarginate and rounded. Hind claw 
lengthened; only slightly curved. Feathers of back with 
paler edges ; breast streaked with dusky. 
a. Wings much pointed, and lengthened. 
Point of wing formed by four outer primaries, of which the 
4th sometimes a little shorter than 3d. Hind toe and claw 
as long as middle, shorter than tarsus, the claw alone 
usually a little longer than the toe itself, and slightly 
curved ; inner toe and claw longer than the outer; out- 
stretched toes falling short of the tip of tail; hind toe and 
claw shorter than tarsus “ 2 6 = 3 - Anthus. 
Point of wings formed by four outer primaries, the 1st 
longest, or as long as others. Legs stout, the outstretched 
toes reaching almost to tip of tail. Hind toe and claw 
longer than tarsus, the claw very long, but equal to the 
toe proper . . . : : : . . . Neocorys. 
b. Wings short, rounded. 
Point of wings formed by four outer primaries of nearly 
equal length . - - F : : = : - Notiocorys. 
Point of wings formed by five outer primaries, the 1st shorter 
than 3d . 4 C : - : - < - - Pediocorys. 
MOTACILLA, Linn. 
Motacilla, Linn. 8. N. 1735. (Type Motacilla alba.) 
The first mentioned species under Motacilla, in the 10th edition 
of the Systema Nature of Linneus, is luscinia, or the European 
Nightingale. If this work be taken as the starting point of the 
Linnean binomial nomenclature, it will be necessary to find some 
other name for the genus, perhaps Pallenura, Pauuas (fide Gray). 
