VoLXiii."] Gilbert and Keank, Black-eared Cuckoo. 8l 



19/8/11. — One Black-eared Cuckoo's egg and two eggs Little Field- 

 Wren, Flemington, N.S.W. 



14/9/11. — One Black-eared Cuckoo's egg and two eggs Little Field- 

 Wren, Flemington, N.S.W. 



16/9/11. — One Black-eared Cuckoo's egg and two eggs Little Field- 

 Wren, Flemington, N.S.W. 



26/1 i/ii. — One Black-eared Cuckoo's egg and two eggs Little Field- 

 Wren, Blacktown, N.S.W. 



14/9/12. — One Black-eared Cuckoo's egg and two eggs Little Field- 

 Wren, Blacktown, N.S.W. 



14/10/12. — One Black-eared Cuckoo's egg and two eggs Little Field- 

 Wren, Blacktown, N.S.W. 



3/11/12. — One Black-eared Cuckoo's egg and two eggs Little Field- 

 Wren, Blacktown, N.S.W. 



17/11/12. — Found fledgling in nest of Little Field- Wren, Blacktown, 

 N.S.W. 



6/12/12. — Saw young one being fed bv t.ittle Field-Wren, Blacktown 

 N.S.W. 



Eggs of Mesocalius palliolatus (top row). 

 Eggs of Chthonicola sagittata (bottom row).* 



FHOM A PHOTO. BY P. A. GILBERT. 



On 24/12/12 an adult Black-eared Cuckoo was seen flying 

 from the direction of a nest under observation. Closer examina- 

 tion revealed that an egg of the Little Field-Wren had been 

 ejected, and was lying 4 inches from the entrance. Two eggs of 

 the foster-parent and one of the Cuckoo were found in the nest, 

 thus showing, as in common with other Cuckoos, that where a 

 full set already exists one is thrown out and replaced by a Cuckoo's 

 egg. The data here collated demonstrates that the Black-eared 

 Cuckoo evinces a decided preference for the nest of the Little 

 Field-Wren {C. sac^ittata) in Eastern Australia. In Western 

 Australia the nest of the Redthroat (Pvrrholcrmus h)i:nu:'a) is 

 frequently chosen. 



* For natural colour see pi. xiii., fig. 17. 



