THE AlERICAl^ ASbUUlAiiuiM 

 V&K THE AD^Al^CEMENT OF SCIERC 



PSYCHE. 



ORGAN OF THE CAMBRIDGE ENTOMOLOGICAL CLUB 



EDITED BY GEORGE DIMIMOCK AND B. PICKMAN MANN. 



Vol. II.] Cambridge, Mass., January, 1879. [No. 57. 



The Nervous System of Phylloxera. 



While engaged in studies on the anatomy of the Coccidae ^ 

 there were not at my command specimens of the grape-vine 

 pest — Phylloxera vastatrix Planch., so that, very naturally, my 

 first concern, on returning from Europe in the summer of 

 1876, was to submit the grape-vine louse to a hasty scrutiny, 

 principally with the view of ascertaining whether it agreed 

 with other plant-lice in the possession of salivary glands. 

 That question was soon settled in the affirmative, but, inas- 

 much as the glands did not present peculiarities strikingly dif- 

 ferent from those already described at length for Aspidiotus, 

 there seemed no reasonable grounds for publishing the results 

 of my short studies. Although some other points in the anat- 

 omy of Phylloxera seemed to me of interest, I hesitated to 

 make any aimouncement of them, thinking that the great 

 amount of attention recently bestowed upon these insects had 

 probably, at that time, already led to a very thorough acquaint- 

 ance with their anatomy. Being at the time without access to 

 the literature on Phylloxera, it therefore seemed best to defer 

 any statemevit till such time as I might have the opportunity to 

 learn what had already been written by others. 



Investigations of another sort have enticed me from the 

 further study of the plant-lice. But for an inquiry from Mr. J. 

 Duncan Putnam, of Daven])ort, Iowa, it is likely I should not 

 have ventured to oflPer anything on this subject to the readers 

 of Psyche. Late in January 1878, Mr. Putnam wrote to me : 



1 Mark: Beitriige zur Anatomic vinJ Histologie der Pflanzenlause, insbesondere der 

 Cocciden ; in Ai'chiv fiir mikroskopische Anatomie, Bd. 13, S. 31-86, Taf. 4-6. 



