Larus barrovianus

Larus barrovianus Ridgw. The Auk. 1886, vol. III, n. 3, p. 330. — Nelson, Rep. Nat. H. Coll. Alasea, p. 51.

Larus glaucus Palmén, Bidr. Sibirisk Ishafsk. Fogelf. Vega-Exped. p. 365 (partim.).

«In plumage ressembling L. glaucus and L. leucopterus, and in size intermediate between these two species; very different from the former, however, in shape of the bill, which bas the dept through the angle never less, and usually decidedly greater, than through the base, instead of exactly the reverse; mantle averaging somewhat darker than in glaucus with an obvions or tolerably abrupt line of démarcation between the white tips on the primaries and the pearl blue of their basal portion».

«Males (four specimens): wing 17,00 — 18,00 (average 17,44); tail 7,30 7,50

(7,45); culmen 2,00 — 2,30 (2,19); deptli of bill through angle 0,80—0,85 (0,82); through base 0,75—0,80 (0,79); tarsus 2,55 — 2,78(2,64); middle toe with claw 2,53—2,75(2,64).

«Females (four specimens) wing 16,25 — 17,25 (16,81); tail 7,00 7,20 (7,11);

culmen 1,88—2,05 (1,98); depth of bill through angle 0,72—0,80 (0,75); through base 0,70—0,75 (0,72); tarsus 2,40—2,50 (2,45); middle toe with claw 2,35—2,50 (2,42) «Habitat. Behring Sea and contigous waters, northeastward to Point Barrow, southwestward to Japan (in winter). Type JV?. 88,912 Ü.S. Nat Mus. S ad. Point Barrow, Alasea August 4, 1882; Middleton Smith collecter.

«There is apparently no différence in plumage between the two species in the immature plumages, of which the National Muséum collection possesses a good sériés in ail stages; but they may be very readily distinguished by the size and shape of the bill as pointed out above».

Ne connaissant pas l’oiseau des mers de Behring nous nous bornons à citer la récente description de M. Ridgway, qui a comparé une riche série des oiseaux de l’Alasca et des mers voisines avec une série également nombreuse des différentes localités du nord de l’Atlantique.