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Show 526 MR. H. S A U N D E R S O N LAKio.i-. [June 6, under the name of L. cirrhocephalus, has included two other and perfectly distinct species. His no. 87 is really L. glaucodes, Meyen (as is also his no. 51, which is rightly named), a species with a black or dark brown hood (similar in that respect to our L. ridibundus), which ranges from the Falklands to the coast of Chili. On the other hand his nos. 68 and 69 are respectively young and adult of L. maculipennis, Licht., another dark-hooded Gull, very close to L. glaucodes, but from which it is distinguishable by the wing-pattern. Hitherto L. maculipennis, which is the common Argentine species, has not been known to occur beyond the Chuput valley, Eastern Patagonia, 43° S.; and this is the first time it has been obtained on the Pacific coast. It was already sufficiently remarkable that two such very closely allied and yet perfectly distinguishable species of Gull as L. maculipennis and L. glaucodes should be coexistent within so limited an area ; but now that their range is shown to intersect, it is stranger than ever. Reverting to L. cirrhocephalus, which has been so repeatedly confused with totally distinct species, it may be excusable to repeat that it has a pale grey or lavender hood, slightly darker on the neck, and that the only species with which it can be confounded is its South-African representative L. phaocephalus, Sw. LARUS BELCHERI, Vigors. Larus belcheri, Vigors, Zool. Journ. iv. p. 358; Scl. & Salv. P. Z. S. 1871, p. 575 ; Saund. op. cit. 1878, p. 182. [No. 4, San Lorenzo Island, Callao Bay, August 1881. Eyes brown, legs yellow. No. 7, Callao Bay, August 1881. No. 8, Coquimbo Bay, November 1881.] The first is an adult with pure white head and underparts ; the second is in the brown plumage of the first year ; the third is a bird of the second year which has already assumed the dark mantle of the adult, but still retains the brown hood and slightly mottled underparts indicative of immaturity. This stoutly builfspecies is a very remarkable Pacific form, uniting, as it does, all the main features in which the Gulls of the Pacific differ from those of the Atlantic. In the immature stage it has an exceedingly well-marked hood, which it afterwards loses; in the adult stage it still retains a very defiued black bar on the rectrices. Altogether it resembles L. crassirostris of Japan far more closely than any other ; but it is a coarser species, and has a more defined hood in the immature plumage than the Japanese bird. Larus^ modestus, a more slender but very characteristic species frequenting the coasts of Peru and Chili, but of the breeding-place of which no authentic accounts have yet appeared, is not represented in this collection Another and very rare Gull, hardly a dozen examples of which are known to exist, is Larus fuliginosus, a dark sooty bird with a hood at all seasons, restricted to the Galapagos |