Egg Coloration in the Cuckoo, Cuculus, canorus. 101 
that in ege Cx there is a suggestion of a dark band at the broad end, it is 
impossible by ordinary observation to distinguish these eggs from each other. 
The nests of five foster species are represented by these six eggs. 
VII.—Hleven eggs, believed to be lard by the same bird, taken by the 
Museum Mark. 
River Ouse, Huntingdonshire. 
Foster. 
Date when taken. 
Ev Reed Warbler 18th June 1909 
Ke Reed Bunting 24th May 1910 
E 11 Sedge Warbler 4th June 1910 
13, Whitethroat : 4th June 1910 
E 5-1 Sedge Warbler . 6th June 1910 
Ew Whitethroat : 8th June 1910 
H/o Sedge Warbler 8th June 1910 
E v! Sedge Warbler 8th June 1910 
E ii Reed Bunting 11th June 1910 
Ex Reed Warbler 11th June 1910 
E o/ Reed Warbler 15th June 1910 
Notes on the individual Lqys of this Group. 
Hv. This egg resembles the Reed Warbler’s in appearance, but is lighter, 
the speckling is more uniform in size all over, not run into blotches but 
more thickly laid down at the broad end, forming an irregular ring not unlike 
a Blackbird’s egg. 
Ec. The above description holds good for this egg. 
E11. This egg cannot be distinguished from the foregoing. 
H°, On this egg are two end-spots sharply defined ; otherwise as above. 
H 5-1. Quite similar to the others already mentioned. The markings 
are not so intense as those of the Sedge Warbler in this nest, nor so greenish, 
but except for size the egg is remarkably like the foster eggs. 
Hw. A marked general resemblance to others of this set. 
L/o. Like the rest. The resemblance here to the foster eggs is remark- 
able. The Sedge Warbler’s eggs here are darker than those of H 17; they 
vary more amongst themselves than do the Cuckoos’ in this set. 
Ev'. This egg is slightly paler than the others on one side, towards the 
narrow end. 
H iii. Like the others generally. 
Hx, There are some larger spots towards the narrow end, but general 
appearance is as the others. 
FE o/. Like the others generally. 
