Vol. xxiii] ENTOMOLOGICAL NEWS. 73 



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 species swarming nearby at the same time were Cliir- 

 onomtis hyperboreus, var. meridionaHs, Joh., and the may-flies. 

 Ephemerella excrucians Walsh, and SipJilonisca aerodromia 

 Ndrri. 



Notes on Florida Thysanoptera, with description of 



a new genus. 



By E. A. BACK, Virginia Agric. Exper. Sta., Blacksburg, Va. 



While in Orlando, Florida, engaged in a study of the Aley- 



rodid pests of Citrus, the writer collected several species of 



Thysanoptera upon which the following notes have been made. 



Leptothrips aspersus Hinds. 



This species previously recorded from Massachusetts, Cali- 

 fornia and Barbados Island, was frequently found at all times 

 of the year on both new and old Citrus foliage. 



Scolothrips 6-maculatus Pergande. 



The distribution of this species as given by Hinds is Mis- 

 souri, Iowa, Wisconsin and Nebraska. It has been recorded 

 by both Pergande and Bruner feeding on mites. Found feed- 

 ing on red spider on Citrus and several weeds during Spring 

 of 1909. 



Heliothrips hemorrhoidalis Bouche. 



This species, which has been spoken of as one of our worst 

 greenhouse pests, was found specially abundant during the 

 Fall of 1908 in colonies on the foliage of red maple (Acer 

 rnhniui} . 



Aleurodothrips fasciapennis Franklin. 



This species is of special interest from an economic stand- 

 point in that it preys upon both the citrus white-fly (Alcyrodcs 

 citri) and the cloudy-winged white-fly (A. nubifera'). It has 



