February, '09] JOURNAL OF ECONOMIC ENTOMOLOGY 35 



in our field, some of them, indeed, as old as agriculture in America ; 

 and new ones seem to rise faster than the old are solved. By reason 

 of our past achievements, the country is coming to expect more and 

 more of us, and is yearly more willing to enlarge our opportunities 

 and support our undertakings. Whoever is privileged to look back, 

 from this place, on the work which this Association is to do during 

 the coming fifteen years, Avill certainly have a most interesting and 

 inspiring retrospect; and, speaking in the spirit of this season of 

 ^ood-will to all, I wish to each and all of you joy in your work, 

 and a large and important share in the investigations and achieve- 

 ments of this coming time. 



Afternoon Session, Monday, December 28, 1908 



The meeting was called to order by President Forbes at 1.20 p. m. 

 The following paper was presented : 



PEMPHIGUS TESSELLATA FITCH 

 By Edith M. Patch, Orono, Me. 



The life cycle for comparatively few of the genus Pemphigus is 

 known. Because the egg stage has not been found for many of 

 this genus a tradition has sprung up that the true sexes and egg 

 stage are commonly lacking for Pemphigus. 



For several years the common Alder Blight has attracted me for 

 various reasons, and has held my curiosity both because the migrants 

 from the alder in September are indistinguishable from the migrant 

 of Pemphigus acerifolii Riley, in July, and because there seemed 

 to be no place in the life cycle of Pempliigus tessellata for a mi- 

 gratory generation. The apparent purposelessness of the September 

 migrants from the alder seemed especially strange. 



Perhaps a brief statement of the life cycle of P. tessellata upon 

 the alder will emphasize this. We have with the first warm days 

 in spring the hibernating generation, hardy, little, partly grown 

 forms, coming up from under the leaves at the base of the alder 

 where they have wintered, and establishing themselves at the alder 

 tips in time for the first sap of the season. These, when mature, 

 become the first of several similar successive generations of apterous 

 viviparous forms. The last of these apterous viviparous generations 

 in the late fall give birth to the hibernating young which completes 

 an apparently sexless cycle for this species. 



