(TRUDEAU'S TERN.)
+Sterna trudeauii+, _Scl. et Salv. Nomencl._ p. 147, _iid. P. Z. S._
1871, p. 570; _Durnford, Ibis_, 1877, p. 200 (Buenos Ayres);
_Saunders, P. Z. S._ 1876, p. 660. +Sterna frobeenii+, _Phil. et
Landb. Wiegm. Arch._ 1863, pt. i. p. 125 (Chili).
_Description._--Above light grey; head white, with a dark
transocular line on each side; rump white: beneath light grey; bill
black, base and tip yellow; feet yellow: whole length 12·5 inches,
wing 10·0. The young are pure white below, and have darker quills.
_Hab._ Coasts of S.E. Brazil, Argentina, and Chili.
This beautiful Tern, peculiar for its white head in the adult dress, was
observed by Durnford on Flores Island in the Rio de la Plata, and in
other places on the coast of the Argentine Republic. One was obtained
near Punta Lara, in October 1876; and many more since by Mr. E. Gibson,
Commander MacFarlane, and others.