1872.J FROM THE PELEW AND MACKENZIE ISLANDS. 113 



The specific differences of St. frontalis, Gray, from New Zealand, 

 which we formerly erroneously confounded with this species, have 

 been pointed out already (Journ. f. Orn. 1870, p. 365). 



The Pelew Islands are a new locality for St. longipennis. 



47. Sterna melanauchen, Temm. ; F. & H. Centr. Polyn. 

 p. 224. 



Two adult specimens, one from the Pelews (Capt. Heinsohn), the 

 other from Uap (Kubary). Both localities are new for this species. 



48. Sterna ltjnata, Peale ; Hartl. P. Z. S. 1867, p. 331 ; H. & 

 F. ib. 1868, pp. 9 & 118. 



One specimen from Pelew (Capt. Peters). 



49. Anous stolidus (L.) ; H. & F., P. Z. S. 1868, p. 9 (Pelew). 



Seven specimens from the Pelews (Capis. Heinsohn and Peters). 

 They agree exactly with specimens from N. America and Africa, but 

 vary in the intensity of the dark colouring, and especially as regards 

 the coloration of the head. In some the front and forehead are 

 greyish white, changing into pale grey on the occiput and nape, 

 and into pale ashy grey on the hind neck ; in others the whole sur- 

 face of the head is pale brownish grey. In one paler-coloured, 

 apparently younger, specimen the head is uniform sooty brown like 

 the neck, but mixed with single white feathers, which, above the 

 black loreal regions, form an indistinct white supercilium. In all the 

 specimens the lower half of the eye is margined narrowly with white ; 

 the legs and toes are blackish, the membranes lighter. 



As regards the variation in size in this species, we must remark 

 that the specimen from North America spoken of in Ornith. Centr. 

 Polyn. p. 236, has not full-grown remiges, the first being just deve- 

 loping ; from this cause the wing is much shorter. 



We append the measurements of the Pelew specimens, to show 

 the individual variation amongst specimens from the same locality. 



50. Anous tenuirostris (Temm.). 



1 Sterna senex, Cranch in Tuckey's Voy. Zaire (1818), App. 

 p. 407. 



Sterna tenuirostris, Temm. (nee Riipp., nee Heugl.) PI. Col. 202 ; 

 (Temm.) Kittl. Kupfert. Heft iii. (1833), p. 28, f. 2, tab. 36. f. 1 

 (opt.). 



Proc. Zool. Soc— 1872, No. VIII. 



