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DOUBLE-CRESTED PIGEON. 
that eminent naturalist ; for, although an approach 
from the Fruit-eating Pigeons or Carpophaga, to 
the true Pigeons, is made by C. spadicea and diiopha, 
still the form of their feet, evidently better adapted 
for arboreal than terrene habits, and their general as- 
pect, are such as to shew that some intermediate form 
is wanting to bring them into that immediate con- 
nexion with the group represented by the European 
Ring Pigeon, which M. Temminck seems to inti- 
mate.* 
In size the Diiopha nearly equals the Chestnut- 
shouldered Pigeon, some specimens measuring near- 
ly eighteen inches in length. The wings are long 
and powerful, reaching, when closed, beyond the 
middle of the tail, the second, third, and fourth fea- 
thers, are the longest, and nearly equal to each other, 
the fifth is shorter than the first. The bill is of a 
rich orange colour, the tip of the under mandible 
obliquely truncated, that of the upper compressed and 
moderately arched, with a rounded culraen. The 
frontal crest originates on the upper part of the bill, 
immediately behind the horny tip, and above the 
nostrils, and is composed of long arched feathers 
pointing backwards, of a soft and loose texture, their 
colour bluish-grey, tinged with rufous or reddish- 
brown. The occipital crest is also decumbent or 
falls backwards, and is likewise composed of long 
• The Columba Trocaz of the Illustrations of Ornitho- 
logy, appears to be one of these intermediate forms. 
