40 BIRDS OF NEW ZEALAND. 
Egg.—Pale brownish green, spotted, chiefly at the obtuse end, with 
large, indistinct pale purple and brown blotches ; length, 3; breadth, 
2-1 (Layard). 
South Island, both hemispheres outside the tropics. 
107. LESTRIS PARASITICUS. Temm. C.M. 
Skua Gull. 
Back and wing coverts, brownish cinereous ; top of the head, brown, 
varied with white ; neck and breast, white ; abdomen, dusky ; quills and 
tail, black ; two long narrow plumes from the tail. (Immature). 
ipl Well: B., 1:3; T., 1-65. 
Until specimens in the adult plumage have been obtained, it is im- 
possible to identify this bird satisfactorily. 
Cape of Good Hope, colder parts of northern hemisphere. 
Larus. J. 
Brut, arched at the tip, nostrils, near the middle ; tarsi, nearly as long 
as the middle toe. 
All parts of the world, except Polynesia. 
108. LARUS DOMINICANUS. Licht. C.M. 
Black-backed Gull. Karoro. 
L. antipodum. Gray. L. pacificus. LAYARD. 
Wuirte, with black back and wings, secondaries tipped with white. 
Young.—Brown, mottled with white ; over the tail, white, banded with 
brown. 
iow Lory 9B. 2°25 2, 2°25. ‘ 
Hyg.—Yellowish grey, marked with grey and dark brown blotches ; 
length, 2°85 ; breadth, 1°85. 
The whole southern hemisphere. 
109. LARUS SCOPULINUS. Forst. C.M. 
Mackerel Gull. Tarapunga. 
L. Jamesont. GouLtp nec WILS. 
Waite, with pale ash grey back and wings ; secondaries, ash ; first and 
second quills black, with a large spot of white near the tips, most of the 
others white, with a black band near the tips, all tipped with white ; 
