226 PHYLLOSCOPIN. 
Hypolais obsoleta, Severéz. 
Murray’s Vertebrate Zoology of Sind, p. 158. 
THE DESERT TREE WARBLER. 
Wing, 2°4; tail, 2; culmen, 0°8. 
The general color of the upper parts is a sandy-brown or pale 
isabelline-brown ; in other respects the coloration is that of 
the two or three preceding species or sub-species ; third and fourth 
primaries nearly equal and longest; second primary, in a skin 
from Turkestan, intermediate in length between the sixth and 
seventh, and in one from Sind between the seventh and eighth; 
the bastard primary exceeds the primary-coverts by 0°35 mches 
in both skins. 
This Warbler has been procured in Sind, but is very rare. 
The following key, originally published im Vol. V, Cat. Br. 
Mus., may prove useful in discriminating the foregoing :— 
A. General color of the upper parts brown or grey; under 
parts white or pale brown; outside tail-feathers 0°15 
to 0'2 inches shorter than the longest. 
(a) Second primary intermediate between the fifth and 
sixth ; bastard primary falling short of the primary- 
covert by 0:1 inches, or extending 005 beyond 
them. Lengths of wing, 2°8 to 3:05 ches. 
H. LANGUIDA. 
B. Bastard primary exceeding the primary coverts by at least 
0°1 inch. 
(a) General color of the upper parts sandy or isabelline- 
brown. 
H. OBSOLETA. 
C. General color of the upper parts darkish rufous-brown 
or grey. 
(a) Second primary generally intermediate between the 
fifth and sixth ; bastard primary exceeding the pri- 
mary coverts from 0:1 to 03 inches. Length of 
wing, 2°75 to 2°5 inches. 
H. PALLIDA. 
(b) Second primary generally intermediate between the 
seventh and eighth, oreighth and ninth ; bastard 
primary exceeding the primary-coverts from 0:2 to 
0-4 inches. Length of wing, 2°53 to 2°3 inches ; 
culmen, 0°6 to 0°53. 
H. RAMA. 
(c) Second primary generally intermediate between the 
sixth and seventh; bastard primary exceeding the 
primarycoverts 0°15 to 0:26. Length of wing, 2°38 to 
2°28 inches ; culmen, 0°51 to 0°5. 
7 H. CALIGATA. 
Genus, Phylloscopus, Bodd. 
Bill very slender, small, straight, shallow, barely deflected at 
