418. Poor-will. Phalænoptilus nuttallii. Common summer resident; breeds from plains to 8,000 feet; has been noted up to 10,000 feet.
418a. Frosted poor-will. Phalænoptilus nuttallii nitidus. Rare summer resident; few typical nitidus taken; a more southern variety.
420a. Western nighthawk. Chordeiles virginianus henryi. Abundant summer resident; breeds on the plains and up to about 11,000 feet; in fall ranges up to 12,000 feet; most common on plains and in foothills.
422. Black swift. Cypseloides niger borealis. Summer resident; abundant locally; southwestern part of the State; breeds from 10,000 to 12,000 feet, and ranges up to 13,000 feet.
425. White-throated swift. Aeronautes melanoleucus. Summer resident; not uncommon locally; breeds in inaccessible rocks from 6,000 to 12,000 feet, if not higher; most common in southern part of the State.
429. Black-chinned humming-bird. Trochilus alexandri. Summer resident; local; only in southwestern part of the State, and below 6,000 feet.
432. Broad-tailed humming-bird. Selasphorus platycercus. Common summer resident; Colorado's most common hummer; breeds from foothills to 11,000 feet; ranges 2,000 feet above timber-line in summer.
433. Rufous humming-bird. Selasphorus rufus. Summer resident; local; a western species, coming into southwestern Colorado, where it breeds from 7,000 to 10,000 feet, and ranges in summer several thousand feet higher; a few records east of the range.
436. Calliope humming-bird. Stellula calliope. Summer visitor; rare or accidental; but two records, one near Breckenridge at an altitude of 9,500 feet; western species.
443. Scissor-tailed flycatcher. Milvulus forficatus. Summer visitor; rare or accidental; but one record; southern range, and more eastern.