no BIRDS OF COLORADO. 



all the plains region in a few days. The females arrive about 

 a week later than the males. Begins to migrate south late in 

 August and disappears the latter part of September. 



607. Piranga ludoviciana. Louisiana Tanager. 



Summer resident; common. In migration occurs on the 

 plains for 50 to 75 miles east of the foothills. It is common at 

 Pueblo, but 80 miles east of there at Fort Lyon, Capt. P. M. 

 Thorne did not see one in five years' residence. It was taken 

 however at Finney County, southwest Kansas as a rare straggler, 

 May 20 and June i, 1893. During the breeding season it deserts 

 the plains and is common at 10,000 feet. Few breed below 

 7,500 but some as low as 6,000 feet. Arrives on the plains the 

 middle of May and moves into the mountains early in June. 

 Breeds the last of Jime and remains in the mountains until 

 September. The last leave the State late in October. 



[608. Piranga erythromelas. SCARLET Tanager. 



a male was taken by Mr. Bond at Cheyenne, Wyo., May 28, 1889. (Auk, 

 VI. 1889, 341.) The bird is common a little farther east, but has no Colorado 

 record. This individual may have crossed Colorado to reach Cheyenne, which 

 is just over the Colorado line, or it may have passed westward up the Platte]. 



6ioa. Piranga rubra cooperi. Cooper's Tanager. 



Summer visitant; rare or accidental. A southern species 

 common in New Mexico and Arizona, but scarcely coming north 

 to Colorado. Only one specimen known, taken by Henshaw at 

 Denver, May 10, 1873. (Henshaw, 1875, 239.) 



611. Progne subis. Purple Martin. 



Summer resident ; not common and local. Appears to be 

 almost entirely lacking along the eastern slope of the Rocky 

 Mountains and the plains at their base. As common in Utah 

 as in the east and not uncommon in the extreme western part 

 of Colorado. Again to the eastward, it is common in Kansas 

 and extends a little way across the border into Colorado. In 

 eastern Colorado, it arrives the last week of April and remains 

 to breed on the plains. In western Colorado it arrives about 

 the same time, but goes into the mountains for the summer, 

 breeding from 6,000 to 8,000 feet; farther west in Utah it 

 breeds both in towns on the plains and in the mountains. 



612. Petrochelidon lunifrons. Ci.iFF Swallow. 

 Summer resident; abundant. Breeds everywhere from the 



plains to 10,000 feet, nesting both on cliflFs and under eaves. 

 Arrives the last of April and first half of May. Breeds late in 

 June. There is so long a time between its arrival and the be- 

 ginning of nest building that breeding occurs at about the same 

 time on the plains and in the mountains over the whole of 

 Colorado. 



