J^ebraska Ornithologists' Union 79 



IDll, and probably remained in the region still later, after 

 I liad left the locality. The species is not so common as the 

 preceding- one, although its numbers may increase during 

 cold weather. 



57. Chordeiles virginiamis virginianus (Gmelin) — Nighthawk. 



A single female of the typical eastern Nighthawk was 

 taken September 3, 1912, a short distance out in the hills. 

 Evidently here, as probably elsewhere in the state, the 

 three native varieties of nighthawks overlap ranges during 

 migration and all forms are of equally probable occur- 

 rence during that time. 



58. Chordeiles virginiamis henryi Cassin — Western Night- 



hawk. 



On August 30 and 31, 1911, I saw several nighthawks 

 which were so conspicuously rufous that I am inclined to 

 think that they belonged to the form henryi, which breeds 

 to the north and west of the Reserve in the Pine Ridge re- 

 gion and spreads eastward during migrations. 



59. Chordeiles virginianus sennetti Coues — Sennett Nighthawk. 



The Sennett Nighthawk is the common form of night- 

 hawk breeding in the sandhillsi and is present throughout 

 the summer from May until September. It nests on tlie 

 hills, and there I have frequently flushed the birds from 

 sandy places, bare or sparsely dotted with vegetation 

 where I was certain that a nest, so called, was situated, 

 but it was almost impossible to find a nest unless the spot 

 from which the birds arose was accuratel}'^ 'marked down.* 

 A female Sennett Nighthawk collected as late as June 22 

 contained a fully developed egg in the ovary showing that 

 nesting was still in progress. 



In the evenings the nighthawks were common in the 

 river valley and about the nursery beds, but in the daytime 

 they were seldom to be seen except out in the hills. There 

 their characteristic "peent" could be heard very fre- 

 quently, often followed by the hollow, vibratory "whoo- 

 00-00- — " as a bird stopped itself suddenly in a headlong 

 descent and began to mount upward again. The white 

 patches on tlie wings rendered the birds moderately con- 

 spicuous even at dusk, when they accompanied the bats 

 through the air in their insect hunting. 



60. Chaefjira pclagica (Linnaeus) — Chimney Swift. 



On the evening of May 31, 1912, a lone Chimney Swift 



