(i. STEENA. 



Ill 



k". Ad.sk. 



I", m". J 2 "<J- 



sk. 

 n". Ad. sk. 



o", p". (S 2 ad. 



sk. 

 y''. c? ad. sk. 



r". Juv. sk. 



s". c? iniin. .sk. 



t". Ad.sk. 



m". Ad. sk. 



v". Ad. sk. 

 w". Ad. ; .x". 



Juv. sk. 

 y". c? ad. sk. 



£". Skeleton. 



a\ Sternum. 



Between Australia and New 



Zealand. 

 Lord Howe Island {Sydney 



Mus.). 

 Ilaine Island, N.E. Australia. 



Eaine Island, N.E. Australia. 



Levuka, Fiji Is., Pel). {E. L. 



Zayard). 

 Suva, Fiji Is. 



riiceuLs; Is., June. 



Starbuck I., Oct. {Comm. Mac- 



Farlane, R.N.). 

 Ilowland I. 

 Krusenstern Is. 

 Oahu, Sandwich Is. 



Bonin Islands, Aug. 1, 1890 



{P. A. Hoist). 

 I. of liodriguez {Rev. H. S. 



Slater). 

 Jamaica. 



E. Newman, Esq. 



[P.]. 

 Seebohm Coll. 



J. B. Jukes, Esq. 



[P.]. 

 II.M.S. ' Challenger 



Exp. 

 Tweeddale Coll. 



CM. Woodford, Esq. 



[P.]. _ 

 J. J. Lister, Esq. 



[P.]. 

 H. Saunders Coll. 



H. Saunders Coll. 

 H. Saunders Coll. 

 Sir E. Belcher [P.]. 



Seebohm Coll. 



Transit of Venus 



Expedition. 

 Gosse Coll. 



24. Sterna balsenarum. 



Sternula balffinarum, Strickl. Contr. Orn. 185:2, p. IGO; Chapman, 

 Trav. S. Aft: ii. p. 425 (1868 : Walvisch Bay) ; Gurney, in An- 

 dersson^s B. Damaraland, p. 363 (1872) ; ILeine ^' Reichenow, 

 Nomencl. Mm. Ilein. p. 355 (1890). 



Sterna balfenarum. Gray, Hand-l. B. iii. p. 121, no. 11064 (1871) ; 

 Saunders, P. Z. S. 1876, p. 664 (revision) ; Sharpe S,- Bouvier, 

 Bull. Soc. Zool. France, 1876, p. 314 (Massaba, Congo) ; Reichenoic, 

 J. f. 0. 1877, p. 11 (Loango) ; Saunders, Journ. Linn. Soc. xiv. 

 p. 403 (1878: distribution); Bocage, Orn. Angola,^. 490 (1881); 

 Sharpe, ed. Layard^s B. S. Afr. p. 705 (1884) ; Salvin, Cat. Strickl. 

 Coll. p. 625 (1882 : Damara-Iand ; type) ; Tristr. Cat. Coll. B. p. 8 

 (1889). 



Adult in hreeding-plumage. Forehead, lores, crown, and nape 

 black ; mantle and rump pearl-grey ; shafts of primaries white ; 

 outer webs and inner webs next the shafts on the two outer quills 

 dark grey, in the others paler grey, the inner margins of all chiefly 

 white ; tail-feathers grey on the terminal portions and whitish 

 towards their bases, the outer pairs chiefly white ; uuderparts white : 

 bill black, acute, the maxilla nearly straight ; tarsi and toes ochre- 

 yellow. Total length 9 inches, culmen 1-35, wing 6-7, tail 3, depth 

 of fork 1, tarsus U*55, middle toe and its long curved claw 0'65. 

 The sexes are alike in plumage. 



Adult in luinter. Similar to the above, but lores, forehead, and 

 crown flecked and mottled with white. 



Immature. Like the above, but the upper wing-coverts slightly 



