362 
Philippine Journal of Science 
1920 
Mariveles during a severe typhoon/ The last specimen lacks 
the tail, and the species has not been determined. It is possible 
that both petrels and shearwaters nest on some of the many, 
small, uninhabited islands of the Archipelago. The gannets and 
the man-of-war birds have been rarely collected in Philippine 
waters, yet they are abundant on their breeding grounds, the 
small islands of Sulu Sea.® Gannets are believed to nest also 
on Didicas Rocks, north of Luzon.® During typhoon weather 
man-of-war birds are seen near Manila, and there is a record of 
FregoM ariel (Gould) having been collected on the northern 
coast of Luzon.^ 
Larus ridibundus Linnaeus, a small species of gull, is fairly 
common in Manila Bay, but the genus is poorly represented in 
Philippine waters. The only other gull recorded is Lar'us vegse 
(Palmen). However, there are several species of terns. Hy- 
drochelidon leucoptera (Temminck) is rare, and H. hybrida 
(Pallas) is fairly abundant. A 710 US stolidus (Linnaeus) has been 
collected in Sulu Sea, and Mici'anous worcesteri McGregor, an 
endemic species, breeds in abundance on Cavilli Island, in Sulu 
Sea.® Seven species of Sterna have been recorded from various 
parts of the Islands. Sterna boreotis Bangs is a large and 
abundant species; the others are small and of irregular dis- 
tribution and occurrence, and very little is known about them. 
With the exception of Micranous worcesteri, all of these terns 
are of rather wide distribution in the world. Not much effort has 
been made to collect them, and the Philippine records are very 
sporadic. For example. Sterna sinensis (Gmelin) , which ranges 
from the Chinese and Indian seas to Australia, has been recorded 
in the Philippine Islands only from widely separated islands — 
Mindanao, Mindoro, Palawan, and Polillo. Siquijor was for a 
long time the only Philippine locality for Sterna fuscata Linnaeus, 
but this species is now known to breed on Maeander Reef.® 
Panay is the type locality of Sterna ansetheta Scopoli ; although 
this species is well known in many parts of the world, the records 
of it as a Philippine bird are surprisingly few. Sterna gracilis 
‘Idem, Bull. Philip. Mus. 4 (1904) 12. 
‘Worcester, D. C., Philip. Journ. Sci. § D 6 (1911) 167. 
‘Ibid. § A 2 (1907) 275. 
’Grant, W. R. 0., Ibis VII 2 (1896) 128. 
‘McGregor, R. C., Philip. Journ. Sci. § D 6 (1911) 184. Mathews 
places this species in the genus Megalopterus; see also Ridgway, Birds of 
North and Middle America 8 (1919) 553. 
‘McGregor, R. C., Philip. Journ. Sci. § D 13 (1918) 4. 
