This species is like the last, but the back is greenish, only the tail being reddish brown. These birds generally locate their nests at low elevations near the end of overhanging branches, on vines, weed stalks, or bushes, but have been found as high as 90 feet above ground. The nests of this species are made of plant fibres and cobwebs, generally decorated with lichens. The two white eggs measure .50 × .32. Data.--Santa Monica, Cal., May 29, 1896. Nest two feet from the ground in a sage bush. Collector, W. Lee Chambers. [Illustration 279.] [Illustration: E. L. Bickford. ANNA'S HUMMINGBIRD.] [Illustration: right hand margin.] Page 278 435. MORCOM'S HUMMINGBIRD. _Atthis morcomi._ Range.--This species is known only from a single specimen, taken in the Huachuca Mountains, Arizona, in 1896. 436. CALLIOPE HUMMINGBIRD. _Stellula calliope._ Range.--Western United States from British Columbia southward, and from the Rocky Mountains west to eastern Oregon and California. This is the smallest of North American Hummers, being but 3 inches in length. It is greenish above and has a violet gorget showing the white bases of the feathers. They build their nests in all manner of locations from high up in tall pines to within a foot of the ground in slender bushes. The nests are made interiorly with plant down, but the outside is generally grayish colored shreds and lichens. The eggs average but a trifle smaller than those of _colubris_, .45 × .30. 437. LUCIFER'S HUMMINGBIRD. _Calothorax lucifer._ Range.--Mexico, north to southwestern Texas and Arizona. This species, which is common in parts of Central Mexico, occurs only casually north to our borders and has not yet been found nesting there. They build small compact nests of plant down attached to the stalks or leaves of plants or weeds. 438. REIFFER'S HUMMINGBIRD. _Amizilis tzacatl._ Range.--Abundant in southern Mexico; casual in southern Texas. This species is greenish above, with a bronzy lustre; the tail is reddish brown, and the throat and breast are metallic green. They breed abundantly about houses and nest apparently at all seasons of the year in Central America, where they are the most common species of Hummers. [Illustration 280: 436--437--438.] [Illustration: deco.] [Illustration: left hand margin.] Page 279 439. BUFF-BELLIED HUMMINGBIRD. _Amizilis cerviniventris chalconota._ Range.--Lower Rio Grande Valley in Texas and southward through Mexico. These birds are like the last but have the underparts a pale brownish buff color. They are quite common in their summer range in the United States, nesting at a low elevation in bushes and low trees. The two eggs are white, .50 × .35. Data.--Brownsville, Texas, May 5, 1892. Nest of fine bark-like fibre on the outside, lined with lint from thistle plant; located on limb of small hackberry. Collector, Frank G. Armstrong. 440. XANTUS' HUMMINGBIRD. _Basilinna xantusi._ Range.--Southern Lower California.