78 Zoology of Colorado 



tus) which has been taken in St. Charles Canon, Pueblo County. 

 The two remaining species are very much alike, the back black, 

 with an elongated white patch in the middle. The outer tail 

 feathers are barred with black, and the wing measures only about 

 four inches, in Batchelder's Woodpecker (D. pubescens homorus); 

 while the outer tail feathers are white, and the wing is over four 

 and one-half inches, in the Hairy Woodpecker (D. villosus). Nearly 

 all the specimens of the latter species found in Colorado belong to 

 the subspecies D. villosus monticola of Anthony, the type locality of 

 which is in Boulder County. It is larger than the eastern or 

 typical race, and has no spots on the wing coverts. 



MACROCHIRES 



The Caprimulgidae have recently been divided, on structural 

 grounds, into two families, the night-hawks being separated as a 

 family Chordeilidae. The Western Night-hawk (Chordeilcs minor 

 henry i) is a well known bird, regarded as a sign that spring has 

 surely come. Oberholser has recently separated a race howelli, 

 found in our region. The true Caprimulgidae, with long con- 

 spicuous rictal bristles below the mouth, include the Poor-will 

 (Phalacnoptilv s nuttalli of Audubon), which is not uncommon in 

 summer. The paler form nitidus of Brewster occurs with the 

 others, and is not a subspecies.* 



Of Cypselidae, or swifts, we have two species. The Black 

 Swift (Nephoecetes niger borcalis) is black without any light mark- 

 ings. The White-throated Swift (Aeronaules melanoleucus of 

 Baird) has the under parts white. 



The humming-birds (Trochilidae) are undoubtedly of South 

 American origin, but they invaded the temperate parts of North 

 America sufficiently long ago to have given rise to some very 

 distinct forms. The common species in Colorado is the Broad- 

 tailed Humming-bird (Selasphorus platycercus) ; it goes upward in 

 the mountains to 1 1 ,000 feet. Related to this, but with the back 

 mainly rufous in the male, the flanks and under tail-coverts 

 washed with rufous in the female, is the Rufous Humming-bird 

 («S. rufus). It is found principally in the southwest part of the 



*For the anatomy, see Margaret E. Marshall, Proc. Airier. Philosophical Society, XLIV. 

 (1905.) 



