36 CALIFORNIA ACADEMY OF SCIENCES [P»oc. 4th Ser. 



Introduction 



The following paper on "Some Japanese Aphididse" has been 

 prepared jointly by the authors as a small beginning to the 

 study of this very interesting family in Japan. To the junior 

 author belongs the part of collecting and preserving the ma- 

 terial, taking full notes on color, localities, host plants, and 

 dates of collection, as well as the packing and shipping of the 

 material. The senior author is responsible for mounting the 

 specimens on slides, determining the species, writing up the 

 descriptions of new species, and making the drawings. It is 

 to be regretted that distance and lack of time prevented sending 

 the final manuscript to Dr. Kuwana for revision and correction. 

 As the specimens were placed loosely in small vials of alcohol 

 and were subjected to a long journey, many were entirely 

 ruined, while others lost the legs, antennae, wings, or other 

 body parts. Every original lot. of which there were some 107, 

 was given a collection number and accompanied with full field 

 notes. All of the material was collected at or in the vicinity of 

 Tokyo during the year 1913, and was received in several send- 

 ings during the latter part of that year and the first part of 

 1914. Because of the press of other duties, however, it was 

 impossible to do anything with it until this late date. The 

 Japanese, English and scientific names of the host plants are 

 given wherever possible, the scientific names being revised ac- 

 cording to the latest editions of the "Index Kewensis" by 

 Hooker and Jackson and the "Encyclopedia of Horticulture" 

 by Bailey. 



Because the material represents such a very small part of the 

 Japanese Aphid fauna, no attempt has been made to work out 

 a scheme of classification and keys, but rather to give simply 

 the notes and descriptions as clearly and briefly as possible. 

 Drawings have been made to illustrate the more important 

 characters and to supplement the descriptions. They are fully 

 labeled so as to avoid lengthy explanations. The use of the 

 camera lucida has made it possible to enlarge all to a common 

 scale and they are so reproduced in the plates. Transferring 

 the drawings by tracing paper has rectified the objects to their 

 actual position on the slides. 



In describing a new species it was thought best to set aside, 

 wherever possible, a single representative individual as the type. 



