73 ENTOMOLOGICAL NEWS. [Feb., 'l2 



swarm would often move away and return, a little later, 

 to the first place. It swarmed within four feet of the ground, 

 generally much lower, averaging, perhaps, two feet. The 

 flight is so irregular that it is difficult to describe. The num- 

 ber of individuals participating in the swarm was about twenty. 

 Other sjjecies swarming nearby at the same time were Cliir- 

 onomus hyperboreus, var. meridionalis, Joh., and the may-flies. 

 Ephemerella excrucians Walsh, and Siphlonisca aerodromia 

 Ndm. 



