224 
L. Glauert. 
others liave been S(;en since that date. Tlie ^luseimi has a specimen A2754 
shot at (lin^'in and a second A5092 cau^'ht whilst incubating its eggs on the 
beach at Busselton. I have also had a repovt tliat a bird had been seen dying 
low at Albany “live or six velars ago.” 
Morus serrator serrator (Gray). Australian gannet. 
A few individuals make their appearance in Gage Road and Cockburn 
Sound every winter. The local specimens in the collection are A41G8 found 
on the Fremantle Railway Bridge in June, 1932, and A48ol fi’om North 
Fremantle, July, 1937. There is also a mounted specimen C461 found at 
Cottesloe in 1896. 
Fregata minor minor ((tmelin). Greater Frigate Bird. 
A specimeiij A1252 caught alive on -Mount's Bay Road on May 4th, 
1917, is lh(‘ only evidence' of tlu' presence' of the species as a wanderer near 
l\'rth. 
Catharacta skua lonnbergi (Math.). Brown Skua. 
Two or three birds can usually be seen off Fremantle in the winter 
months. The bird might be mistaken for a large mutton bird but can 
always be distinguished by its heavy body and more laboured flight. When 
closer the white jtatch on the Avings ads as a good identification mark. It 
is a scavenger and usually hunts its own food though it may liarass other 
sea birds but not to the same extent as the Arctic or Barasitic Skua. The 
!^^UKeuln ])ossess(^ a single specimen A2366 secured out at sea. 
Stercorarius parasiticus (Linne). Arctic Skua. 
The Ardic or Ibn’asitic Skua wliich breeds in the northern hemisphere 
is a regidar summer Ausitor to our short's and can often be seen pursuing 
the twisting and turning Sih'ergull or Tern until the rt'ct'utly caught fish is 
disgorged. Both light and dark phases are represented every year. A 
character of the species is the somcAvhat elongated not twisted central tail 
feathers. F. Lawson Whitlock records that on one oct-asion he found an 
exhausted l>ird on the beach at Cottesloe, Avhich, however, managed to elude 
captiu'e. 
Stercorarius pomarinus (Temminck). Pomarine Skua. 
The Pomarine Skua is another northern visitor to Gage Roads in sum- 
mer time. It is smaller than the Brown Skua and somewliat larger than the 
Arctic Skua from which it can be distinguished at close quarters by the 
curious twist in the someAvhat elongated central tail feathers. Light and 
dark phases occur. 
Observations made from the “Zephyr'^ when travelling to or from 
Rottnest indicate that it is rarer than the Parasitic Skua. 
