128 C. B. THOMPSON AND T. E. SNYDER. 



progeny. In one instance three queens of the third form and 

 one queen of the second form were found together in the same 

 colony, but both sexes of two different mature reproductive 

 castes have never been found in one and the same colony of 

 Reticulitermes . No experiments in crossing the different forms 

 have yet been made. 



The two authors hope to undertake a thorough investigation of 

 the termite castes, especially of the three reproductive types, 

 with an analysis of their breeding. This will be carried on by 

 means of field and laboratory observations and by breeding 

 experiments which will require several years to complete. 



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