ALLIED TERN. 91 



black, varied with white; a crescent-shaped patch of 

 black in front of the eyes; the yellow of the beak 

 less lively. The interior border of the sixth, seventh, 

 and eighth primaries white, and very regularly defined. 



My figure is from a specimen sent to me by Mr. 

 Tristram, and is in the transition state between the 

 two plumages. Like all other birds figured from Mr. 

 Tristram's collection, no notice being given to the 

 contrary, this specimen was shot by Mr. T. himself. 



It has also been figured by Buffon, pi. enl. 987, in 

 summer plumage; Bouteille, Ornitli. du Dauph, pi. 60, 

 fig. 1; Riippell, Atlas, pi. 14; Gould, B. of E., pi. 417. 



The egg is (by permission of the editor) from Baron 

 Warthausen's plate in the "Ibis," vol. ii, p. 127. 



