270 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. XXXIII. 



haunts only a few hours during the day, absenting themselves almost 

 entirely one day, apparently ^\athout reason, to appear in undimin- 



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ished numbers on the succeeding day. A cloud passing before the sun, 

 where several males of Gom.phus are flying, may cause every dragonfly 



