892 APPENDIX. 
COUES KEY, 1884. UNION LIST, 1886. 
771 bis. Add: Larus marinus schistisagus. Siaty-Backep GuLu. Adult: white; 
mantle dark slate-gray. First primary with a long white tip and a gray wedge on the inner 
web; second with a subapical white spot on the inner web only, and the gray wedge further 
down; third with the gray wedge reaching the subapical spot; no gray wedge on outer webs 
of first four primaries. [eet pinkish flesh-color. Bill yellow, with red spot on gonys. Iris 
yellowish cream-color. Nearly the size of the last, from which probably not distinct. N. 
Pacific and Arctic Oceans, coast of Alaska. Bull. U. 8S. Nat. Mus., No. 29, 1885, p. 67. 
772. Larus argentatus. 51. Larus argentatus. 
773. argentatus smithsonianus. 5la. ° argentatus smithsonianu’ 
774. occidentalis. 49. occidentalis. 
775. cachinnans. 52. cachinnans. 
776. affinis. [50. affinis. 
717. californicus. 53. californicus. 
778. delawarensis. 54. delawarensis. 
aera canus. [56.] canus. 
780. brachyrhynchus. 55 brachyrhynchus. 
781. heermanni. 57. heermanni. 
782. Rissa tridactyla. 40. Rissa tridactyla. 
783. tridactyla kotzebuii. 40a. tridactyla pollicaris. 
784. brevirostris. 41. brevirostis. 
785. Pagophila eburnea. 39. Gavia alba. 
786. Chroicocephalus atricilla. 58. Larus atricilla. 
787. franklini. 59. franklini. 
788. philadelphia. 60. philadelphia. 
789. Rhodostethia rosea. 61. Rhodostethia rosea. 
790. Xema sabinii. : 62. Xema sabinii. 
791. furcata. 4. furcata. 
792. Sterna anglica. 63. Gelochelidon nilotica. 
793. ' easpia. 64. Sterna tschegrava. 
794. maxima. 65. maxima. 
795. elegans. 66. elegans. 
796. cantiaca. 67. sandvicensis acuflavida. 
797. hirundo. 70. hirundo. 
798. forsteri. 69. forsteri. 
799. macrura. 71. paradisea. 
800. dougalli. 72, dougalli. 
801. superciliaris antillaram. 74. antillarum. 
802. trudeaui. [68.] ' trudeaui. 
803. aleutica. 73 aleutica. 
_ 804. fuliginosa. 75. fuliginosa. 
805. anezsthetica. .. (76.] anzthetus. 
806. Hydrochelidon lariformis. 77. Hydrochelidon nigra surinamensis. 
807. leucoptera. [78.] _  leucoptera. 
808. Anous stolidus 79. Anous stolidus. 
809. Rhynchops nigra. 80. Rynchops nigra. 
00. [Not admitted in the List.] 
809 bis. Add: Diomedea exulans. WANDERING ‘AcBatross. Adult: White, more 
or less tinged with yellowish, the flight-feathers dusky, the larger wing-coverts and the back 
usually barred with blackish. Bill very stout, with deeply concave culmen, and angulated 
