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Hirundo erythrogastra. Barn Swallow. 



Summer resident; not numerous. Usually arrives about 

 May 1 ; has been seen as early as April 20, 1899. Departs the 

 \ns\ of August or early in September. 



Found over much of the County, but not nearly as common 

 as the Cliff or Violet Green Swallows; perhaps the fourth in 

 abundance of our swallows. Like the others it wanders above 

 timberline in pursuit of insects. 



Iridoprocne bicolor. Tree Swallow. 



Summer resident ; rare. 



Allen noted a pair nesting in June on West Monument 

 Creek. One of the rarest of our swallows, only a few seen. 

 Aiken has noted a breeding colony at Divide Station, Teller 

 County. 



Tachycineta thalassina lepida. Violet-green Swallow. 



Summer resident ; common. Arrives about May 1 ; April 

 23, 1899, being the earliest date. Departs about September 

 1. Wetmore took two at Palmer Lake September 5, 1909. 



This is the most abundant of our swallows ; it seems to 

 breed mostly in the mountains and foothills, nesting in hollow 

 trees, and often using old woodpecker's holes. Allen noted it 

 breeding in holes in the rocks at the Garden of the Gods in 

 1871, and the birds still continue to breed abundantly there. 

 Like the other swallows in August the Violet-green begins to 

 gather in flocks preparatory to the departure for winter quar- 

 ters. For days we see them congregated on the telegraph and 

 telephone wires, then some day they are gone and not seen 

 again until the next spring. 



Riparia riparia. Bank Swallow. Sand Martin. 



Rare ; Aiken mentions seeing it April 26, 1872. There are 

 no records of its breeding in the County. 



