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 

 13,000 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. lyowe 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. 



