The following paper on the Aphididae of the Expedition, by Theo. 

 Pergande, was originally published in the Proceedings of the Wash- 

 ington Academy of Sciences, vol. n, pp. 513-517, Dec. 20, 1900. 

 It is here reprinted from the same electrotype plates, so that it may be 

 quoted exactly as if it were the original. The original pagination has 

 been preserved and transferred to the inner or hinge side of the page, 

 where it is enclosed in brackets, thus [514]; while the consecutive 

 pagination of the present volume has been added in the usual place. 

 The present headpiece and title have been substituted for the running 

 heading of the Academy's Proceedings and the original title, which 

 was : Papers from the Harriman Alaska Expedition. XVI, En- 

 tomological Results (10): Aphididce. No other alterations have 

 been made. 



Editor. 



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