268 
AVES. 
Sterna Dougallii.— The Roseate Tern. 
' Plate LXIII. fig. 6. 
Front, crown, and back of the neck, black ; back, wings, and 
tail, silver-gray *, breast of a rosy hue; bill and legs orange ; 
two middle tail-feathers long, forked, and narrow. Sixteen 
inches long. Inhabits Europe. 
Genus 5.—LARUS.— Linnaeus. 
Generic Character .—Bill long, or medium size, strong, hard, 
compressed, somewhat inflated towards the point, and bent at 
the tip ; under mandible abruptly angulated near the point; 
nostrils lateral, longitudinally cleft, oblong, pervious, and 
situated near the middle of the bill; legs of medium length*, 
tibia partly naked ; tarsus long; three anterior toes connected 
by webs to their tips ; hallux short, articulated a little higher 
than the toes ; tail-feathers of equal length; wings long, first 
and second quills longest. 
Larus Sabini. — Salines Gull. 
Plate LXIII. fig. 7. 
Head, neck, throat, and lower half of the bill, lead-coloured 
gray; wings, back, and tail-coverts, silver-gray; under parts 
grayish-white ; gray of the neck with a band of black encircling 
the neck*, quills black, barred with white; irides black; tip of 
bill cream-yellow; legs dark gray. Fifteen inches long. Inha¬ 
bits Greenland. 
Genus 6.—LESTRIS.— Illiger. 
Generic Character .—Bill of medium size, hard, strong, 
cylindrical, somewhat tumid towards the point, and slightly 
hooked at tip ; upper mandible covered at its base by a cere; 
the lower one angulated; nostrils linear, lateral, situated in the 
middle of the bill; tibia partially naked ; tarsus long; the three 
anterior toes completely connected by webs ; hallux very short, 
and highly articulated on the tarsus ; claws considerably hooked; 
tail somewhat rounded; wings long, first and second quills longest. 
Lestris catarractes. —Brown Squa Gull. 
Plate LXIII. fig. 8. 
Deep brown above, edged with dull rusty ; under parts same 
