143 
INSECTIVOR.E. 
Family MOTACILLID2F. 
Genus Motacilla. f Latham. J 
GREY-HEADED A'ELLOW WAGTAIL. 
Motacilla Jlava, ( Lin. nec llay.) Var, cinereo-capilla. 
2IutacitJa cinereo-capilla, 
if 
i( it if 
it if if 
a f( it 
“ jlava cinereo-capilla, 
“ feJdegffi, 
“ dalmatica, 
Tdergeronnette de printems a tele 
Graukopfige gelhe Schafutelze, 
Savi; Orn. Tosc. iii, p. 216. 
Bonaparte; Icon. d. Faun. 
Ital., pi. 31, f. 2. 
Degland. Dpbots. 
Cabanis. 
Selys-Longchamps. 
ScHLEGEL; Eevue. 
Michaellis. 
Bruch. 
ise. Of the French. 
Of the Germans. 
Specijic Characters . — Feathers of the back and rump olive fijreen; 
throat white. No white or yellow stripe over the eye. All the 
rest as in M. jlava. Length about six inches. 
j'soTHi>"G can better illustrate the difficulties which at 
tend the determination of species w'hen slight alterations 
in colour are taken as sufficiently distinctive, than this and 
the following bird. As Dr. Zander has well remarked, 
we find the two ends of the series of varieties, and 
