142 THE ZOOLOGIST. 
POLAR BASIN. 
(ANCESTRAL CURLEWS.) 
New World and East Asia Old World, from 40° W. 
4 Oo 
from 140° E. to 40° W. to 140° E. 
(Dark rumps.) (Pale rumps.) 
eS o 2 w et 
5 ie ai Ses: S S 
rs) go a 9 5 = 
=} Sc [sa 0Q (ole) 
(ofe) 09 02 les + 
5B 2 45 Ss ae 
~ ~ oO 
S S wa a) 
pie = 9 = 'S Ua ss 
Se: m , 2B 24 LB 
Siac = : SUS =o 
So S09 =? 8 Sd 
= >= =W So Se 
ces S.P S:p =e2 a 2 
eo Ss & S <4 Se =e 
> ~~ oS s 
y= ee kh ee ar 
ao arn ie ey = a B 
= = BSS (=e Ch ae 
Qe Stic Sas aes Se 
=B & by a i nam Oo 
30 = © = 9 Sa ce 
Sp geet So Sf 8 
e © 2. m7 aoe & 99 5 
Si Ss aS ~p5 2, 
mn > & —- =e 
=a ae T! = 
iS a5 = ° < 
Lac} =H >. ra) he 
> : 
S © 
° = 
ER = 
SS 
The reason for assigning the various routes to the subgeneric 
groups of species placed below them are as follows :— 
Of the two species with dark rumps and plain primaries, one 
breeds in Kast Arctic Siberia and the other in Arctic America. 
As the latter is unknown on the Pacific Coast, it is most probable 
that it did not emigrate along the American shores of the 
Pacific, but is the result of a later emigration across Behring 
Straits to Arctic America. 
