32O ENTOMOLOGICAL NEWS. u* 9 



was kept for about fifteen days during which time this 

 Pemphigus was particularly numerous upon the wing. It was 

 found to be seeking the bark of elm (Ulmus americana) and 

 red ash (Fraxinus pennsylvanica Marsh). On the red ash 

 they were seeking also the ash clusters of a gall mite where 

 they deposited the true sexes as they did in the rough bark. 

 (Eriophycs fraxiniphila, Hodgkiss, Me. Agr. Exp. Sta., Bui. 

 162, p. 367). 



In all these situations on the bark of lilac, elm, and ash, and 

 in ash clusters, the minute apterous males and females molted, 

 mated, and the winter eggs were subsequently laid. 



On May 13, 1909, the newly hatched aphids were observed 

 to be crawling up the trunks of the lilac, and by May 20 they 

 were found to be numerous on both the lilacs and ash where 

 they had settled in the angles of the twigs or about the swell- 

 ing buds. They were feeding, growing and excreting honey- 

 dew normally on both these hosts. Fine long bluish-white 

 flocculent strands are secreted from six rows of abdominal 

 glands giving the aphids a very downy appearance. 



This is the first time in my observations of Pemphigus when 

 I have found the same species chosing widely different hosts 

 for the same stage. Whether the stem mothers of Pemphigus 

 venafuscus are also able to develop upon the elm it has not yet 

 been possible to ascertain. 



The fall migrants of 1908 were on the wing for more than 

 a month but the host plant which they had left was not lo- 

 cated. 



Reference to my Pemphigus records and mounted slides of 

 1906, however, showed specimens and notes of apterous vivi- 

 parous, winged viviparous, pupae, and young of the same 

 species which were found upon the twigs of ash June 21-29, 

 1906, at Orono. They did not occur on the leaves. 



By reference to the Maine Station collection and through 

 the kindness of other collectors of this genus I was enabled to 

 compare specimens of this new Pemphigus with authentic 

 specimens of thirteen named species of Pemphigus as well as 

 several undescribed species. This comparison emphasized the 



