BIRDS OP COLORADO. 
181 
western Colorado, while the latter has been introduced and has 
become exceedingly abundant. Out among the greasewoods, 
where greasewood is about the only vegetation that can grow, 
these Quail vie with the lizards as to which shall be the most 
common animal life present. In the whole trip not a dis¬ 
tinctively southern or western species was observed, nor is there 
one in the list of sixty-one species of birds seen there by Miss 
Myra Eggleston during several years residence. The valley of 
the San Juan river serves as a great highway for southwestern 
forms into southwestern Colorado, and many extend along 
the Rio Grande into south central Colorado on the Atlantic slope, 
but apparently there is some conformation of land or condition 
of climate that keeps these forms away from west central Colo¬ 
rado. 
The present bulletin is paged in continuation of bulletins 
Nos. 37 and 44 , and references are to the pages of these bulletins. 
On page 3 the total number of species and varieties known to 
occur in Colorado should be changed to 387 , of which 243 are 
known to breed. Thus in the three years since the Colorado list 
was published, 27 additions have been made and 15 more species 
ascertained to breed in the state. There is good reason to believe 
that the list, even now, is far from complete. A single fact will 
show how great are the future probabilities. In a small collec¬ 
tion of beautifully mounted birds at Cheyenne, Wyoming, pre¬ 
pared by Mr. Frank Bond, are six species of birds taken by him 
at Cheyenne, less than ten miles from the Colorado line, that have 
not yet been found in this state. These species are Sterna hirundo, 
Pelecanus fuscus, Crymophilus fulicarius, JEgialitis meloda circum- 
cincta, Anthus spragueii and Cistothorus stellaris, and there is every 
reason to believe that each of these will eventually be added to 
the Colorado list. 
