H. F. WILSON 85 



MISCELLANEOUS APHID NOTES, CHIEFLY FROM 



OREGON 



BY H. F. WILSON 



Unless otherwise stated, the types of the new species described 

 in these Notes are in the private collection of the author. 



I. LIFE HISTORY NOTES ON PROCIPHILUS FRAXINI- 

 DIPETALAE Essig^ 



That the Pemphiginids in the genus Prociphilus and feeding 

 on ash have the conifers for their alternate food plants, was 

 demonstrated in Europe a number of years ago. In the fall of 

 1909, the writer, in an attempt to trace a winged aphid which 

 was flying through the air in great numbers at Washington, D. C, 

 located them on the roots of the white pine, Pinus strobus, and 

 as this species was later found to develop on Fraxinus sp.,^ the 

 writer was able to work out the relationship of the present species 

 on Fraxinus oregona Nuttall and Pseudotsuga taxifolia (Poir) 

 Brit., in Oregon. 



Each spring there appears on the leaves of the ash a purphsh 

 globose aphid which causes the leaves to curl and assume a gall-like 

 formation. Inside the curled leaves these early spring forms, the 

 stem mothers, produce alive a number of young greenish aphids 

 which become mature pupae about the last of May, and attain- 

 ing wings, usually disappear about the first week in June. These 

 winged forms supposedly^ go to the roots of Douglas fir and 



1 In Europe there are two similar Pemphiginids on ash; owing to a lack of 

 sufficient material, the author is unable at this time to compare the American 

 species with European forms; but as there seems to be practically no distin- 

 guishing characters between them, the American species may prove to be the 

 same as those in Europe. 



2 This species was later described as P. venafuscus by Dr. Edith M. Patch, 

 Entomologist of the Maine Experiment Station. 



3 The writer has tried for three years to colonize the alate form from the ash 

 on Douglas fir for seedlings, but without success. The migi-atory forms from 

 this latter plant have been transferred to ash seedlings with the successful 

 production of eggs and the stem mothers the following sjjring. 



TRANS. AM. ENT. SOC, XH. ^y^^m'': ' 1* 



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