216 LARID^E. 
Favier, but was once obtained by him in immature plumage 
near Tangier. 
Primaries white in adult^ greyish white in the immatm'e 
bird. 
Total length from 261 to 33 inches. 
Subfamily LESTRiDiN^f:. 
319. Stercorarius buffonii, Boie. Buffon^s Skua. 
This Skua is recorded by Favier as twice obtained neai- 
Tangier — in 1846, and in October 1858, the first being an im- 
mature specimen. This is the smallest of the four Europeaji 
Skuas, and according to Mr. Howard Saunders, who kindly 
gave me the distinguishing marks of the Lestridinse, has the 
shafts of only the first and second primaries white, the third 
dusky ; the general colour of the young is also duskier. 
320. Stercorarius parasiticus (Linn.). Richardson's 
Skua. 
Favier only mentions one specimen of this Skua, killed near 
Tangier in 1844. It is, however, not uncommon in winter. 
This species, according to Mr. Howard Saunders, has the 
shafts of the fii-st, second, third, and fourth primaries wliite 
in all stages. 
321. Stercorarius pomarikus, Temm. Pomarine Skua. 
Stated by Favier to be very rare near Tangier ; and he only 
mentions one specimen obtained, as far back as November 
1845. 
1 frequently saw Skuas flying about the Straits in winter, 
but could not succeed in shooting any. They usually appear 
after westerly gales, and are not seen when the weather is 
settled. The adult birds are very rare, and I never myself 
saw any. 
Length about 20 inches, wing 14-25. 
322. Stercorarius catarractes (Linn.). Common Skua. 
Favier records a single specimen obtained near Tangier, m 
