8. PROCF.LSTEKNA. 



133 



Immature. Similar tu the prcoeding, but with a much browner 

 tinge throughout, the moustaches less developed and mixed with ash- 

 browu : bill and feet paler in colour. 



Young. Lower forehead and lores ash-brown, crown and nape 

 rather lighter, orbital region darker ; below the eye a faint grey 

 line indicating the moustache, the detached feathers of which 

 are grey with white lower edges and only about 1^3 inch long ; 

 rest of plumage brownish grey, paler on the throat and chin : bill 

 reddish brown, brighter towards the tip ; tarsi and toes livid. 



Hah. Coasts of Peru and Chile. Xidification unknown and 

 probably peculiar, as the shores frequented are high, rocky and 

 caverned. 



Capt. Lord Byion, 



R.N. fP.]. 

 Salvin-Godman Coll. 

 Capt. W. S. Brett 



(v.\ 



Chincba Islands, Peru, ^Lar.- H. Saunders Coll. 

 Apr. (H. S.). 

 h. S ad. ; i. J Callao Bay, Peru, Aug. (Acbnl. H. Saunders Coll. 



imni. sk. Markham). 



A-. Ad. sk. Guavaquil. Capt. Kellett& Lieut. 



Wood, R.N. [P.]. 



a. Ad. st, ; b. Ad. Chile coast. 



sk. 



e. cT ad. .sk. Chile. 



(I, e. Ad. sk. Valpai'aiso, Chile. 



f,9. Ad. sk. 



8. PROCELSTERNA. 



Type. 



Procelsterna, Lafresn. Mag. de Zool. (2), Ois. pi. 29, cum 



descrip. (1842) , P. Cferulea. 



Range. Pacific, from San Ambrosio to Australia, and northwards 

 to the Fanning group. 



Key to the Species. 



a. Smaller, darker grey above, underparts pale grey . . carulea, p. 133. 



b. Larger, paler grey above, white below cinerea, p. 135. 



1. Procelsterna caerulea. 



Sterna cffirulea, F. D. Bennett, Narr. Jllialinff-Vtii/. i. p. 385, aud ii. 



p. 248 (1840: Christmas L, Fanning group). 

 " Sterne cendre," Nihoux, Rev. Zool. 1840, p. 291 . 

 Sterna teretirostris, Lafresnaye, Rev. Zool. 1841, p. 242. 

 Procelsterna tereticollis, Lafresnaye, Ma;i. de Zool. (2), Ois. pi. 29, 



cum descrip. (1842: type oi FroceUtvnia). 

 Stolida cinerea, Nebou.v, Voy. ' V^nus,' Atlas, pi. 9 (1846 : Pacific, 



N. of Equator). 

 Anous parvulus, Gould, P. Z. S. 1845, p. 104 (Christmas Island, 



Bennett) ; Hartl. Wiegm. Arch. 1852, i. p. 127 ; id. J.f. O. 1854, 



p. 170; Cassin, U.S. E.vpl. E.xp., Birds, p. 393 (1858: Honden 



Island, Low Archipelago) ; Gray, Cat B. Trop Is. Pacijic, p. (iO 



(1859). 

 Anous tereticoUis, Gray, Gen. B. iii. p. 661 (1846). 

 Meffaloptevu.s plnmbeus, Peale, U.S. Erpl. Erp. p. 285 (1848: 



llonden Island). 



