VISCOUNT WALDEN ON THE BIRDS OF CELEBES. 103 
male; Gorontalo, 27th May and 20th July, male and female; Ayer-pannas, 11th, 15th, 
17th August, males and females; Limbotto, 13th September, female ; Pagouat 29th 
July, a nestling (Von Rosenberg); Macassar, E. Timor (Wallace); Philippines (Cum- 
ing); Java (Diard); New Caledonia (Verreaux). Conf. Hartl. & Finsch, Centralpolyn. 
p. 212. 
According to Mr. Sclater (7. c.) there appear to be three races of this Tree-Duck— 
the Philippine, which is the type, the Australian (D. gouldi, Bp.), and the one inhabiting 
Celebes and Timor. It is true that at a later date (P. Z.S. 1866, p. 149) Mr. Sclater 
maintained that the three races are not separable. Professor Schlegel mentions that 
this species only occurs accidentally in Java. 
LARIDZ. 
STERNINA. 
HyprocHELIDON, Boie. 
184. HyprocHELipon niera (Linn.), Syst. Nat. ed. 12, i. p. 227 (1766); Schlegel, Mus. 
Pays-Bas, Sterne, p. 31. 
Hab. Northern Celebes (Forsten, fide Schlegel); Northern Africa ; Southern Europe ; 
Northern and Eastern Asia. 
I include this species on Professor Schlegel’s authority. It has not been recorded 
from any other island of the Malay archipelago, although found throughout China 
(Swinhoe). Its occurrence in India rests on the evidence of specimens collected by 
Dr. L. Stewart (Jerd. B. of India, iv. App. p. 875); in what part of India, is not 
mentioned. 
185. HyprocHELipon LEucopaREra (Natterer), Temm. Man. d’Orn. 2nd ed. ii. p. 746 
(1820), “Hungary ;” Verner, Atlas, pl. 
Sterna grisea, Horsf. Trans. Linn. Soc. xiii. p. 199, “ Java” (1822). 
hybrida, Pallas, Zoog. Rosso-Asiatica, ii. p. 838 (1831), “ Volga;” Schlegel, Mus. Pays-Bas, 
Sterne, p. 32. 
Viralva indica, Stephens, Shaw, Gen. Zool. Aves, xiii. p. 169, “ India” (1825), ex Lath. Gen. Hist. 
x. p. 103. no. 5. 
Sterna delamotta, Vieill. Ency. Méth. Orn. Add. i. p. 350, “ Europe” (1823). 
similis, J. E. Gray, Ilust. Ind. Zool. i. pl. 70. f. 2, ex India (1832). 
Hydrochelidon fluviatilis, Gould, P. Z. S. 1842, p. 140, “interior of New South Wales.” 
delalandii, Bp. Compt. Rend. xlii. p. 773, “ Cap. B. Spei”’ (1856). 
Hab. Lake of Gorontalo, 8th of October, female passing into winter plumage (orsten) 
Pontianac, in Borneo (Diard); abundant in India (Jerdon); Ceylon (mus. nostr.); S.-W. 
Formosa (Swinhoe); interior of Australia (Gould); Cape York (mus. nostr.); Java 
(Horsfield); South and South eastern Europe; Northern and Western Africa. 
