BIRDS OK COLORADO. 
109 
where. Arrives about the middle of May and breeds about the 
first of June. Departs south in September. W. P. Lowe 
reports seeing several in the Wet Mountains at an altitude of 
10,000 feet. 
597a. Guiraca caeruiea eurhyncha. Western Blue Gros- 
beak. 
Summer resident; not uncommon, locally. A southern 
species, known from South Dakota, southwesterly across souths 
eastern Colorado to southern Utah. All the records for Colorado 
come from the Arkansas Valley, where it is reported by Aiken, 
Lowe and Beckham as not uncommon and breeding at Pueblo. 
Capt. P. M. Thorne also saw two at Fort Lyon. Arrives late 
in May. 
598. Passerina cyanea. Indigo Bunting. 
Summer visitant; rare, if not accidental. An eastern spe- 
cies, coming regularly only to eastern Kansas. Taken twice in 
Colorado; once by C. B. Aiken in B 1 Paso County, while the 
other specimen is in the Maxwell Collection, without any record 
as to when or where it was taken. 
599. Passerina amoena. Lazuli Bunting. 
Summer resident; abundant. From the plains to the 
lower foothills, an abundant and characteristic species, breeding 
everywhere. A few breed at 7,000 feet and occasionally wander 
a thousand feet higher. Taken by Capt. P. M. Thorne at Fort 
Lyon and breeds east to western Kansas. Arrives early in May 
and breeds about the middle of June. One was taken by Prof. 
C. P. Gillette July 7, 1896, on Little Beaver Creek, Larimer 
County, at an altitude of 9,100 feet. 
604. Spiza americana. Dickcissel. 
Summer resident; rare. Occurs only on the plains and at 
the foothills east of the Rocky Mountains. A few pairs spend 
the summer each year on the plains near Fort Collins and they 
have been noted at various places from there to Fort Lyon 
where Capt. P. M. Thorne saw six June 22, 1884. five years 
residence there, these were the only ones seen. Farther east in 
Kansas it becomes one of the commonest birds. 
605. Calamospiza melanocorys. Lark Bunting. 
Summer resident; abundant. The most common summer 
bird on the plains. Locally known as the “Bobolink.'’ Much 
more common east than west of the mountains. Breeds on the 
plains and in the foothills to about the limit of cultivated fields 
at 8,000 feet. Becomes rapidly less numerous after passing the 
lowest foothills. Arrives the first week in May spreading over 
