INTRODUCTION. LUI) 7 
feed on insects, and go in small flocks, which are constantly 
in motion, chattering and piping as they go. They are found 
in Africa, India, and Australia. 
A much less extensive group is that of the Bulbuls, and the 
Madras Bulbul (Pycnonotus hemorrhous) may serve as an eXx- 
ample of them. They are Old-World Birds, and are very destruc- 
tive to fruit. There are about one hundred and eighty species 
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The Madras Buibul (Pycnonotus hemorrhous), 
in this family-group, and they are peculiar to the Indian and 
African regions. 
The Barred Woodhewer (Dendrocolaptes radiolatus) may be 
taken as the type of a large family-group of exclusively Tropical 
American Birds, numbering some two hundred and seventy-two 
