Range.--North America, breeding from United States northward. Winters south to Mexico. Gunners know this handsome little duck by the names of "Butter-ball," and "Dipper," a name also given to Grebes. It is also quite similar, but smaller (15 in. long), to the American Golden-eye but has a large white patch on the back of the head, from eye to eye. It is an active bird and, like the two preceding, is capable of diving to a great depth to get its food. Its nesting habits are like the preceding. Eggs eight to fourteen. Size 2 × 1.40. Data.--Alberta, Canada, June 6, 1899. Seven eggs. Nest in hole in tree stump, lined with down. Collector, Dr. George. 154. OLD-SQUAW. _Harelda hyemalis._ Range.--Northern Hemisphere, breeding in the Arctic regions; south in winter to New Jersey and Illinois. The Long-tailed Duck, as it is called, is especially noticeable because the breeding plumage of the male differs markedly from that in the winter. In summer their general plumage is blackish brown, with a white patch around the eye, and white belly. In winter they are largely white. The central tail feathers are much lengthened. They breed abundantly in Greenland, Alaska and the Hudson Bay Territory, placing their nests of grasses and weeds on the ground near the water. It is generally concealed in the long grass. The eggs number from six to twelve. Size 2. × 1.50. Data.--N. Iceland, June 10, 1900. Nest on ground, lined with down. Collector, S. H. Wallis. [Illustration 102: Dull buff.] [Illustration: Buffle-head. Old-squaw.] [Illustration: Buff.] [Illustration: left hand margin.] Page 101 155. HARLEQUIN DUCK. _Histrionicus histrionicus._ Range.--Northern Hemisphere in America, breeding from Newfoundland and the Rocky Mountains in Colorado, northward. South in winter to California and New England. A beautiful and most gorgeous bird, not in colors, but in the oddity of the markings, the colors only including black, white, gray and chestnut. Either sex can be recognized by the small short bill. They breed mostly in single pairs along swiftly running streams, placing their nest, which is woven of weeds and grasses, in the ground near the water. It is also claimed that they sometimes nest in hollow trees. They lay from five to eight eggs, yellowish or greenish buff in color. Size 2.30 × 1.60. Data.--Peel River, Alaska, June 13, 1898. Seven eggs in a hollow in river bank, lined with down. Collector, C. E. Whittaker. 156. LABRADOR DUCK. _Camptorhynchus labradorius._ This bird, whose range was from Labrador to New Jersey in the winter, has probably been extinct since 1875, when the last authentic capture was made. It is a strange fact that a bird of this character should have been completely exterminated, even though they were often sold in the markets. Only forty-one specimens are known to be preserved at present and nothing is known in regard to their nesting habits or eggs.