322 WESTERN GULL. 



and wings light greyish-blue, of a deeper tint than in L. argentatus ; 

 the edges of the wing and the extremities of all the quills are white ; 

 the first seven quills are greyish-black toward the end, that colour in- 

 cluding the outer webs and the greater part of the inner of the two 

 first, and on the rest gradually diminishing, so as on the seventh merely 

 to form a subterminal bar ; the first quill with a patch of white on both 

 webs near the end ; the tips of all being white. 



Length to end of tail 25 inches (but the tail is not full grown) ; 

 bill along the ridge 2^^, along the edge of lower mandible 3\, its depth 

 at the base ^l, at the angle H ; tarsus 2\^ ; hind toe |^, its claw || ; 

 second toe lj%, its claw i^g ; third toe 212, its claw |^; fourth toe 2^|, 

 its claw x'g. 



Young Male. 



Bill flesh-coloured, beyond the nostrils and angle black, with the 

 tips horn-coloured. Feet flesh-coloured ; claws brownish-black. The 

 upper part and sides of the head, the hind part and sides of the neck 

 light brownish-grey, mottled and streaked with white ; on the back the 

 colour is light greyish- blue, some of the feathers mottled with brown, 

 the adult plumage having been partially assumed ; the wing-coverts 

 are chiefly of a greyish-brown colour ; the primary quills greyish-black, 

 without white at the end ; the secondary blackish-grey, margined and 

 tipped with white, finely undulated with brown. The rump is white ; 

 the tail greyish-black, tipped with white ; the whole outer web of the 

 outer, and the basal half of that of the next feather white ; the lower 

 wing-coverts dusky grey. All the lower parts are greyish-white, ob- 

 scurely mottled with pale brownish-grey. 



Length to end of tail 27 inches ; bill along the ridge 2|, along the 

 edge of lower mandible 3y^j, its height at the base ^§, at the angle xl ; 

 wing from flexure 17i ; tail 7^ ; tarsus 2tI ; middle toe 2|, its 

 claw 1^. 



From the above description, it will be seen that in proportions and 

 colouring this species does not difiPer much from L. argentatus. It is 

 much larger, however ; its bill is deeper and stronger in a very con- 

 spicuous degree, and its tarsi and toes are considerably longer. 



