A typical nest of this species is somewhat irregular in shape, and rather coarsely and rudely built. It is composed of stubble and broad grasses variously intermingled, and lined with soft meadow grass. The dimensions vary according to locality. Several nests before us, from New Jersey, Pennsylvania, and the South and West, have an average external diameter of five inches, and a height of three. The cavities, however, are more uniform, and generally measure three inches in width, and one and a half in depth. But when a nest is built in a bush, the outer basketlike frame is carefully interwoven with, and strongly secured to, adjacent twigs. Though somewhat rudely put together, it is nevertheless firmly and compactly woven. The outer framework is usually made of rushes, strong leaves of the iris, and, in some instances, of an additional article apparently similar to mud. Within is packed a mass of coarse materials, over which is placed a thick lining of grasses and sedges. These nests, in the matter of size, differ from the former chiefly in the particulars of length and thickness. The internal dimensions offer no very striking exceptions.
The nest represented in the Plate is three-fourths of the natural size, and was obtained by the writer in the summer of 1879, by purchase, from Mr. Alexander M. Reynolds, of Philadelphia. It was built in a field of grass, many of the stalks of which being wrought in its composition. In figure it resembles an inverted cone, and is beautifully, symmetrically and compactly put together. The outside is formed of grasses and rushes, very neatly and intricately interwoven, and shows here and there a head of dried pappus plucked from some species of hawkweed. The inside is lined with sedges and fine blades of grass. As shown in the drawing, the nest occupies a rather conspicuous position. This was not the case in its natural location. Being found in the centre of a large field, it is at once evident that the authors had spared no pains to make the concealment as complete as possible. In height, this fabric measures nine inches. Its external diameters above, below, and in the middle, are, respectively, six, two, and four and a half inches. The width of the cavity is three inches, and the depth three.
The eggs are oval in contour, of a light bluish ground-color, and are marbled, blotched and streaked with light and dark purple, chiefly about the greater extremity. In size, they vary considerably; the average length of a large number of specimens from different regions being 1.01 inches, and breadth .76. In the Middle, New England and Western sections of our country, this species is single-brooded; but further south, three, and even a larger number of broods, are annually raised.
[Original Size]
Plate VII.—TROCHILUS COLUBRIS, Linaeus.—Ruby-throated Humming-bird.
The Ruby-throated Humming Bird is found throughout Eastern North America as far west as the Missouri Valley, and thence northward to the 57th parallel. It breeds from Florida and Western Texas to the plains of the Saskatchewan and the head-waters of the Elk River.
From its winter-quarters in Guatemala and Mexico, it takes up its line of flight when the season has fairly opened, reaching our southern frontiers late in March. Thence it slowly advances northward in its migration, arriving in Upper Georgia about the 10th of April; in Pennsylvania, from the last of April to the Middle of May, and in its northern habitats, during the last of May, or the beginning of June.