Kansas University Science Bulletin. 



Vol. Ill, No. 1. JULY, 1904. )^'orxifrNo,\ 



KANSAS APHIDIDiE. 



WITH CATALOGUE OF NORTH AMERICAN APHIDIDJ; AND 

 HOST-PLANT AND PLANT-HOST LIST. 



With plates I to XXII. 



BY CHARLES EMERSON SANBORN. 



PREFACE. 



TN securing material for ontogenetic study, I became im- 

 pressed with the number of species of Aphididse existing 

 in Kansas. Accordingly, in the following pages appears the 

 first part of the taxonomic discussion. It is the intention to 

 complete this phase of the subject as soon as some other forms 

 can be obtained. 



The species discussed, whether new or old, have been de- 

 scribed, in order to make them more easily recognized and 

 understood by those interested but who have no access to lit- 

 erature. In doing this, not only have careful measurements 

 been made with the eyepiece micrometer, but an illustration 

 is presented with each specimen described, in order to empha- 

 size characteristics not easily conveyed in words. 



Yet however accurate some characteristics may be given they 

 cannot always be depended upon. For instance, in coloration, 

 variance of color depends not only upon age but also upon the 

 season of the year. The same color may not prevail through- 

 out the growth of an individual. The color present is not al- 

 ways constant in a species, because a change of temperature or 

 a change of food-plant often gives a different tinge to the gen- 

 eral color. Therefore, having these things to deal with, it has 

 been very difhcult to decide definitely in many cases the specific 

 location of forms found. 



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