2o6 Bog-Trotting for Orchids 



about the third week in May, returning with their 

 broods the latter part of September. 



The Twilight-Hawk preys upon other birds and 

 moths. I have observed him at twilight, on a cloudy 

 day in autumn, circling and diving down among the 

 weeds about a potato field, where sparrows were feed- 

 ing in great numbers. The sparrows flew in fear to- 

 w^ard the house, one driving so forcefully against the 

 window-pane that he dropped to the ground with a 

 broken neck. This Night-Hawk gives forth a peculiar 

 moan or call, — '* Peent,"— accompanied by a booming, 

 buzzing sound in flight, as the wind passes through 

 the quills of its feathers. It whizzes swiftly through 

 the air, swooping down upon its prey about the fields 

 or garden. 



The leaves of the Pink Moccasins— sometimes called 

 Whippoorwill's-Shoes — were numerous about the place, 

 the flowers serving, near the ever-changing nests, to 

 attract the insects and moths upon which the birds 

 feed. 



I found another oven-bird's thatched nest in Witch 

 Hollow region, late in June, very near the colony of 

 Ram's-Head Cypripediums. On my return to secure 

 a photograph ot it, I found that some animal — perhaps 

 a dog or skunk — had torn the nest to pieces and de- 

 voured the birdlings. 



The Small Round-Leaved Orchis, which formerly I 

 observed in Chalk Pond region, has developed into the 

 varietal form of this species — producing oblong leaves 

 — known as Habenaria oblo7igifolia. This often occurs 



