152 LARID.li. 



n'. Ad. sk. Krusenstern Is., spring (O. Seebohm Coll. 



Snoic). 

 o',p. In alcohol. Ascension Id. H.M.S. ' Challenger ' 



Exped. 

 q, r'. Skeletons. Rodriguez Id. 



2. Gygis microrhyncha. 



Gygis microrhyucha, Saunders, P. Z. S. 1876, p. 668 and cut (Mar- 

 quesas) ; Tristr. Ibis, 1881, p. 252 (Marquesas); id. Cat. Coll. 

 B. p. 10 (1889) ; Wiglesworth, Abh. zool. Mus. Dresden, 1890-91, 

 no. vi. p. 78 (1892). 



Adidt in hretding-phnnage. Like the preceding species, but 

 smaller, and the shafts of the tail-feathers quite white ; bill black ; 

 tarsi and toes brown, the webs yellow. Total length 10-4 inches, 

 culmen 1-5, depth of the bill behind the nostril 0-25, wing 8-6, tail 

 3-2, tarsus 0*45, middle toe with claw 0-9. 



Not many specimens are known of this species ; but in the eight 

 which I have examined the peculiarities mentioned in the ' Key ' 

 appear to be constant. 



Hah. Marquesas Islands ; perhaps on only one island of that group. 

 The larger species is also found there. 



a. Ad. sk. Marquesas Islands. H. Saunders Coll. 



(Type of species.) 



b, c. Juv. St. Nukahiva, Marquesas Islands. Purchased. 



d. Ad. sk. Nukahiva, Marquesas Islands. J. Gould [C.]. 



Subfamily II. RHYNCHOPINiE. 



12. RHYNCHOPS. ^^ 



Type. 

 Kygchopsalia, Brisson, Orn. vi. p. 222 (1760 : ex Barrere, 



Orn. Sp. Nov. p. 20, 1745) ? R. nigi-a. 



Rhynchops *, Zwm?. Syst. Nat. i. p. 223 (1766) R. nigra. 



" Psalidoramphos and Anisoramphos, Dumont," Rayizani, 



Elementi Zool. iii. p. 62 (1826) ? R. nigra. 



Rhyncbopsalia, Gloger, Sand- u. Hilfsb. p. 463 (1842). 



Char. Bill with the mandibles much compressed, the lower con- 

 siderably the longer ; wings long ; tail short, slightly forked ; feet 

 small, the webs between the middle and inner toes deeply indented. 



Range. Temperate and tropical regions of Xorth and South 

 America ; tropical and juxta-tropical Africa, and India to Burma. 

 Eggs deposited on sand-banks. 



Key to the Sj-iecies. 



a. Bill yellow at the base only, the anterior 

 portion black. 

 a. Secondaries broadly (over 1'5 in.) edged 

 with pure white; under wing-coverts 

 white. 



* Originally Rynchops. 



