BURHINID^. 
is much heavier, the culmen slightly decurved, not so much laterally 
compressed, and much deeper. Cuts showing the nature of these two bills 
will be given in connection with the latter genus. 
The peculiar, enormous development of the bill in these two genera, while 
in BurJiinus no such change has taken place, is of great interest ; moreover 
the difference in formation of the bill in these two is extraordinary. The fact 
that Esacus and OrihorhampTius generally agree in absolute coloration while 
differing as forcibly in bill-formation, would induce speculation — especially 
as Burhinus has much the same coloration as (Edicnemus : though it has become 
larger than Esacus, yet the bill has scarcely developed at aU. 
