THE IBIS. 
EIGHTH SERIES. 
No. VI. APRIL 1902. 
XII. — On some rare Palcearctic Birds' Eggs. 
Bv H. E. Dresser, F.Z.S. 
(Plate VI.) 
During the past twelve months I have been experimenting 
upon the three-colour process for eggs_, with a view to the 
publication of a work on Palsearctic Oology illustrated by that 
method. Thanks to Mr. Geddes, of Messrs. Andre & Sleigh, 
Ltd., successful results seem now to have been attained. 
The plate accompanying my last paper (Ibis, 1901, plate ix.) 
was executed by this process from a water-colour drawing, 
but the figures in that accompanying the present paper 
have been photographed from the eggs direct, without the 
intervention of an artist, and, in fact, have not been touched 
by hand. I give these particulars because this is undoubtedly 
the first illustration of birds^ eggs executed by the new 
process which has been published. 
The Plate contains figures of the eggs of the following 
species : — 
(1) Chettusia leucura (Licht.). White-tailed Plover. 
(PI. VI. figs. 1 & 2.) 
Nothing appears to have been known respecting the 
nidification of this Plover until Mr. N. Zarudny found it 
breeding in Transcaspia, as stated below. It is a somewhat 
rare species in South-eastern Europe, but nests in Trans- 
SER. VIII. VOL. II. N 
