96 



/>'. c? ad. ; q". 2 Tonoratabii, Friendly Is., 

 vix ad. sk. Nov. (Dr. Cojjjnnger). 



r^. Imm. sk. Society Islands. 



s', i'. 2 vix ad. et Eaiatea, Society Islands, 

 imm. sk. Nov. (•/. Young). 



««% v\ (S 5 ad. sk. Hualieine, Society Islands, 

 Xov._ (J. Y.). 



vf . Ad. sk. Huaheiue. 



a*. Skeleton. 

 y^, s\ Skulls. 



Australia. 



Australia {Macgillivray). 



Voy. H.M.S. 'Alert.' 



Hume Coll. 



H. Saunders Coll. 



H. Saunders Coll. 



J. H. Gurney, Esq, 



lP-I: 



Warwick [Pur- 

 ckased]. 



Voy. H.M.S. 'Rattle- 

 snake.' 



18. Sterna bernsteini. 



Sterna bernsteini, Schleg. Mns. P.-Bas, Sternte, p. 9 (186.3 : Halma- 



hera)*; Fimcli, Neu-Guin. p. 18-4 (180.5) ; Grai/, Hand-l. B. iii. 



p. 120, no. 11060 (1871) ; Saunders, P. Z. 8. 1876, p. 657 (revision 



Steminse) : Hartl. Vog. Madag. p. 380 (1877) : Sharpe, Phil. Tr. 



clxviii. p. 4(53, Rep. Trans. Venus (1879 : Rodriguez) ; Salvad. 



Ann. Mns. Civ. Gen. xviii. p. 407 (1882) : id. Orn. Papuasia S/'c. 



iii. p. 435 (1882) ; Saunders, P. Z. S. 1886, p. 336 (Diego Garcia) ; 



JE. Newton, Tr. Norw. Soc. iv. p. 553 (1888 : Mascarene Is.). 

 Thalasseus bernsteini. Bias. J.f. O. 1866, pp. 81 & 86. 

 Sterna maxima, Milne- Edwards S; Grandidier, H. N. Madaqasc, Ois. 



p. 656 (1882). 



Adult in ivinter plumage. Forehead and lores white ; crowu, nape, 

 and long acuminate crest-feathers black mixed with white ; mantLj 

 very pale grey, even lighter than in S. maxima : primaries similar 

 in pattern to those of that species, but paler on the outer webs and 

 with a larger extent of white on the inner webs ; rump and tail- 

 feathers palest grey ; underparts white : bill olivaceous at the base, 

 yellower towards the tip ; tarsi and toes black, with a reddish 

 tinge. Total length 17 inches, culmen 2-6, wing 12'9, tail 5-8, 

 depth of fork 2-2.5, tarsus 1*2, middle toe with claw 1-3. 



Immature. Similar, slightly darker on the upper parts, especially 

 the centres of the inner secondaries and the webs of the primaries. 



The adult in hreeding-plumage is not yet known with certaint}-, 

 but from the abrupt termination of the black on the forehead in all 

 the specimens I have examined, there can be little doubt that 

 Schlegel was right in assuming that this species belongs to the 

 group with the white frontal band. 



Hah. Island of Halmahera (Gilolo) ; Diego Garcia, Chagos 

 group ; the Seychelles ; the Island of Rodriguez, and probably the 

 rest of the Mascarene Islands. 



a, b. Ad. sk. 



c. 5 imm. sk. 



d. (S sternum. 



Goilon, Island of Rodriguez 



{Rev. H. H. Slater). 

 Seychelles. 

 I. of Rodriguez. 



Transit of Venus Expe- 

 dition. 

 SheUey Coll. 

 Transit of Venus Exped. 



Type in Leyden Museum examined. 



