Egg Coloration in the Cuckoo, Cueulus canorus. 108 
These are grey eggs with a moderate amount of brownish speckling. The 
small brown dots are fairly numerous and quite noticeable upon these eggs. 
A comparison of the eggs of this set with those in the previous one reveals a 
difference in ground colour and in size and amount of superimposed blotch- 
ing. Although the two sets are from the same area, they are probably the 
product of two different Cuckoos. Again, three foster species are involved. 
X.—Seven eggs, taken in the same district as the two preceding sets. 
Museum No. Foster. Date when taken. 
H7 ; j Reed Warbler 5 : . ord June 1913 
H 8 ; ; Lesser Whitethroat : . Oth June 1913 
1 a ae d Reed Warbler 3 : . 12th June 1913 
Jc fake Pie : Reed Warbler : : . 16th June 1913 
ee, : Sedge Warbler. . 23rd June 1913 
AAT). E Reed Warbler i F . 24th June 1913 
Has 5. : Whitethroat . ; f . 29th June 1913 
These eggs again differ from the two previous sets, but amongst them- 
selves constitute a very uniform group. The ground colour is a pale bluish- 
green of a deeper tint than set K. The latter is a yellowish-green ; this set, 
when placed alongside, looks quite different. The grain of brown speckling 
is finer and does not run into large blotches as in set K. Four foster species 
are involved. 
XL—Two eggs, taken at West Clitheroe. 
Museum No. Foster. Date when taken. 
JL 7G ; Meadow Pipit . ; . 19th May 1913 
il 4/10 : ; Tree Pipit . i , . 22nd May 1913 
This is a pair of beautiful eggs of a general pale reddish hue, with 
reddish-brown speckling thickly distributed, especially at the broad end. 
The eggs are quite different in appearance from any of the other sets 
described in this paper, whilst they are practically indistinguishable from 
each other. There are two fosters in this case. 
- XII.—Three eggs, taken near Huntingdon. 
Museum No. Foster, Date when taken. 
5 : . Hedge Sparrow . . 28th May 1913 
9 : é . Whitethroat ; ; . 5th June 1913 
16 ; : . Reed Warbler. i . Ist July 1913 
