BIRDS OF COLORADO. 
95 
507. icterus galbula. Baltimore Oriole. 
Summer resident; rare. The first record for Colorado is 
that by Allen, that it is rare westward to the base of the Rocky 
Mountains. Aiken afterwards found it in El Paso County and 
there was one specimen in the Maxwell Collection. Undoubt- 
edly breeds, though there is no record as yet of the nest having 
been found. 
508. Icterus bullocki. Bullock’s Oriole. 
Summer resident; abundant. More common at the west- 
ern edge of the plains than the Baltimore Oriole is in the east. 
Breeds abundantly on the plains and in all the mountain region 
below 10,000 feet. Arrives early in May and breeds late in 
June. Departs in September, though Beckham saw two at 
Pueblo as late as October 24. 
509. Scolecophagus carolinus. Rusty Blackbird. 
Migratory; rare, if not accidental. A pair were shot near 
Denver December 17, 1883. (H. G. Smith, Auk, III. 1886, 284.) 
Prof. Wm. Osburn took one at Loveland November, 1889. 
(Science XXII. 1893, 212.) These are the only authentic 
records for Colorado. It has been several other times reported, 
but was evidently mistaken for Brewer’s Blackbird. 
510. Scolecophagus cyanocephalus. Brewer’s Blackbird. 
Summer resident; abundant. Occurs throughout the 
State, breeding from the plains to 10,000 feet. Arrives on the 
plains the middle of April, and journeys upward as fast as open 
marshes appear. Nests the last of May. In August and Sep- 
tember large flocks ascend 3,000 feet above their breeding 
grounds and swarm over the country above timber-line to 
1 3,000 feet. Retire in October and are common on the plains for 
a month longer. A few remain through the winter in the lower 
portions of the State. 
511b. Quiscalus quiscula aeneus. Bronzed Grackle. 
Summer resident ; not uncommon locally. Only in east- 
ern Colorado to the base of the Rocky Mountains. Henshaw 
found it rather numerous at Denver; just about to build May 
14. The first arrived at Burlington, Colorado, May 9, 1896. 
Capt. P. M. Thorne writes that he has taken it at Fort Lyon 
and W. P. Lowe says that it breeds near Pueblo. There is no 
Colorado record of its breeding above 5,000 feet. 
514a. Coccothraustes vespertinus montanus. Western 
Evening Grosbeak. 
Winter visitant ; irregular and not uncommon. Is liable 
to occur anywhere in Colorado during the winter season. It has 
been seen at all times from early fall to late spring. Capt. P. 
