COLLECTING. 
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found in similar localities in winter, but migrates 
northward during the summer, breeding in the 
interior, from Utah to the Arctic regions. 
Graculid^e : Cormorants. — Occur on sand- 
bars in the south, or on rocky cliffs in the north, 
and on the Pacific coast. During migrations they 
keep well out to sea. They have the habit, in 
common with the gannets and pelicans, of alight- 
ing on barren sand-spits which rise out of the 
water. 
Plotid.e : Darters. — The snake-bird of the 
south occurs on bodies of fresh water, and may be 
seen perched on trees or flying high in air. They 
are exceedingly difficult to kill, being, as a rule, 
shy, and very tenacious of life. 
Tachypetid^e : Frigate Birds. — The frigate 
bird is found with us only on the Gulf of Mexico 
and among the Florida Keys. They are usually 
seen upon wing, but I have observed thousands 
perched on the mangroves on the Keys. They 
roost on the trees on lonely islets at night, at 
which time they appear so stupid that they may 
be approached quite readily. 
Piletontid^e : Tropic Birds. — These fine 
birds occur only in tropical waters unless they 
are accidentally blown out of their latitude by 
