566 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 9 



Micro-photographs taken of samples 1, 3, and 6 indicate that the 

 particles of the frozen arsenates are uniformly larger than those of 

 the unfrozen arsenates. Figures 5 and 6 of Plate 46 show samples 

 1 N. F, and 1 F. as they appeared when sampled with a tube during 

 agitation of the solution. The particles of frozen arsenate are much 

 larger and because of this it is difficult to get an even "spread" of 

 suspended material. 



Figures 7 and 8 representing samples 3 N. F. and 3 F. (stearated) 

 also show the increase in size of particles after freezing. 



Figures 9 and 10 representing samples 6 N. F. and 6 F. also indi- 

 cate that although the settling properties of the arsenates are unaffected 

 b}^ freezing, the physical properties of the particles are greatly altered. 

 What effect this change will have upon the adhesive properties of the 

 arsenates of lead when sprayed under ordinary conditions is not known. 

 The chemical and physical properties of the unfrozen and frozen lead 

 arsenate pastes will be studied in this laboratory and their insecticidal 

 efficiencies will also be compared. 



In conclusion the writer wishes to acknowledge his indebtedness to 

 Professor A. L. Lovett who obtained the opinions of specialists in this 

 field, and also to Professor John Fulton and Professor S. H. Graf for 

 assistance in photographic work. 



Conclusions 



1. The settling properties of some commercial samples of lead 

 arsenate paste are affected by freezing while others are not. 



2. The microscopical appearance of all lead arsenate pastes ex- 

 amined were altered. 



3. The adhesive properties of lead arsenate pastes may be affected 

 by freezing. 



AN INDIAN ANT INTRODUCED INTO THE UNITED 



STATES 



By William Morton Wheeler 



During the past summer while helping Mr. S. A. Rohwer to ar- 

 range the Pergande collection of ants recently acquired by the United 

 States National Museum, I found a series of workers of a common 

 Indian ant, Triglyphothrix striatidens Emery, that had been taken 

 August 14, 1913, by Mr. E. R. Barber at Audubon Park, Louisiana. 

 As this interesting insect has only recenth' spread from its original 

 home in Southern Asia and has not been previously recorded from the 

 United States, it seems advisable to publish a description and simple 

 drawing of it and to trace its history in myrmecological literature. 



