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Fam. STUENIDJE. 
Genus HETERALOCHA. (Peculiar to New Zealand.) 
Maoris. (Case II. Nos. 33, 43, and 46.) 
This species is confined to the wooded ranges in the most 
southern part of the North Island. It differs from all other 
birds in this respect, that the two sexes have differently 
formed bills. This bird subsists chiefly on a grub which in¬ 
fests decayed trees ; and the different development of the 
mandibles in the two sexes enables them to perform separate 
offices. The male attacks the infested tree, chiselling out his 
prey by sheer strength, while the female probes with her 
long pliant bill the deeper cells, where the hardness of the 
surrounding wood resists the chisel of her mate. 
Genus CREADION. (Peculiar to New Zealand.) 
1. Creadion carunculatus, Gruel. Saddle-back. tfc Pu- 
rourou. ;j? (Case II. Nos. 6 and 22.) 
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