348 STEPHEN G. RICH 



Postscript 



Since this paper was completed, J. E. Tillyard's article, "A 

 study of the rectal breathing apparatus in the larvae of Anisop- 

 terid dragonflies," has appeared (Trans. Linn. Socy. London, 

 Zool., vol. 33, 1916). While the results obtained independently 

 by Tillyard and myself are similar, the forms studied are so 

 different, that there is no undesirable duplication. 



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