. Handbook of birds of the western United States including the great plains, great basin, Pacific slope, and lower Rio Grande valley . Fig. 4. 1. Upper mandible with distinct basal saddle. Stercorariidae : Jaegers, etc., p. 17. ^^C^ 1. Upper mandible in one piece. ^^ ^ Laridae: Gulls and Terns, p. 19, Fig. 6. KEl^ TO FAMILIES OF WATER BIRDS ORDER TUBINARES: TUBE-NOSED SWIMMERS. 1. Nasal tubes separated and at sides of bill. Diomedeidse : Albatrosses, p. 32. r. Nasal tubes connected on top of : Fulmars, Shearwaters, and Petrels, p.

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