91 



Genus— STERCORARIUS. — Centre pair of rectiices project 3 in. 



'662. S. crepidatllS, Banks (Lestris richardsoni), Richardson Skua. 



Light Form. -Breast, chin, and hind-neck dull white ; forehead, 

 crown, and abdomen brown. 



Dark Forni — Washed with sooty throughout ; neck pale yellow. 

 Total length, 20 in ; culmen, l"5in. ; wing, 13 in. ; tail, central 

 pair 8 in. (5 in. without central) ; tarsus, 1"7 in. ; middle toe with 

 claw, 1 7 in. 



Hab. : 4, 5, 6. 



663. S. pOlUatOrhillllS, Brisson, Pomarine Skua 



Wing over 14 in. ; central rectrices broad, rounded at the ends, 

 projecting 4 in. in the adult, and twisted vertically. 

 Hab. : 1, 2 (winter) ; Siberia in summer. 



ORDER— TUBIN ARES. 



External nostrils are produced into tubes. Palate schizognathous. Nasals 

 holorhinal. Anterior toes are fully webbed ; hallux small or absent 



FAMILY— PROOELLARIID^. 



Nostrils united exteriorly above culmen. Second primary the longest. 



Sub-family— OcEANiTiN^. 



Tarsus twice as long as femur. 



Genus — OCEANITES. — Basal phalanx of middle toe not much flattened, 

 less than the remaining joints and claw ; claws sharp, spatulate ; 

 scutellse of front of tarsus obsolete. 



664. O. OCeanicilS, Kuhl. (Thalassidroma wilsoni, Aucl.), Yellow- 



webbed Storm-Petrel (Wilson Storm-Petrel). 



Adult. — Sooty black, forehead and under surface rather paler ; 

 greater wing coverts greyish ; upper tail coverts white ; under wing 

 coverts sooty ; tail black ; shafts of lateral rectrices towards base, 

 and the portion of inner web adjoining, white ; bill and legs black. 



Total length, 6"8 in. ; bill, 0"7 in. ; wing, 6'1 in. ; tail, side 2"7 in., 

 centre 25 in. r ta.rsus, 14 in. ; middle toe, 11 in. 

 Hab. : 3. 4, 5. 6, 9. 



Genus— GARRODIA. — Basal phalanx of middle toe not much flattened, 

 less than the remaining joints and claw ; claws sharp, spatulate ; 

 scutellre of front of tarsus distinci 



665. Cr. nereis, Gld. (Procellaria nereis, Bparte. ; Thalassidroma nereis, 



Gld. ), Grey-backed Storm-Petrel. 



Head, neck, and chest sooty-grey; abdomen white; rump and 

 edges of wing coverts grey. 



Total length, 67 in. ; bill, 0'6 in. ; wing, 5'2 in. ; tail, 2*7 in. ; 

 tarsus, 12 in. ; middle toe, 1*2 in. 

 Hab. : 3, 4, 5, 6, 9. 



Genus — PELAGODROMA. — Basal phalanx of middle toe not much 

 flattened, less than remaining joints and claw ; claws flattened and 

 wide. 



666. P, marina, Lath. (Procellaria fregata, Linn. ; Thalassidroma 



marina. Leas.), White-faced Storm-Petrel. 



Face and under surface pure white ; behind the eye a line of 

 slate ; under surface grey and brown. 



Total length, 8 in. ; bill, 0'9 in. ; wing, 5'8 in. ; tail, centre 

 275 in., lateral 3"1 in. ; tarsus, 1"6 in. ; middle and outer toe, 1*3 in. 

 Hab. : 4, 5, 6, 9. 



