ENTOMOLOGICAL NEWS. 485 
TC flsignsous. géueration-is matarkig and) tekighne 
rt ae excessively numerous progeny which winter among the . 
s on the ground, a generation of large winged forms ap- 
ear 5 upon the alder stem in flocculent masses containing some- 
mes a few apterous forms and sometimes in clusters where the 
apterous forms are the more numerous. 
wT winged forms take flight without producing young 
upon the alder, and early in September in those seasons when 
decies is'particularly numerous the flight of this Pemphigus 
SUE Misiderable a6 t0 give the appearance of a slight now 
_ $torm in the air. The bodies of the migrants are dark but the 
SE ate whitish and powdered and much of the flocculent wax 
A aaa anettod abe age 
oe such flight was noticed September 1, 1905 and several in 
I August and early September, 1908. On account of the ex- 
__ essive numbers of syrphus maggots and the larvae of the wan- 
__ derer butterfly, Feniseca tarquinius* in 1906 the alder blight 
Be _ Was nearly exterminated in the vicinity of Orono that season 
and during 1907 the colonies were not plentiful. This present 
___ Season, however, they are again numerous and at the time of 
| BEE 8 winged Pemphigus wes seen to be congreghting 
4 (tcl numbers upon the trunks of maple on the cam- 
puis, particularly Acer dasycarpum Ehrh. and the ornamental 
suit leaved maples. Microscopic examination showed no distinc- 
tion between the Pemphigus newly alighting upon the maple 
trunks and these taking flight from the alder and it was with 
intense interest that the following observations were made. 
August 27, 1908. Winged viviparous Pemphigus covering 
= . of cut leaved maple. They are seeking the crevices 
Seer s- 
August 28, Pieces of bark torn back from maple trunk show 
te winged viviparous Pemphigus and their numerous progeny, 
minute forms which under a lens prove to be the sexual forms, 
_many of them being in copulation. 
7 August 28. Winged Pemphigus tessellata removed from 
¥ ‘alder before flight and placed in cage upon twigs of maple 
 * Me. Agr. Exp. Sta, } Bul. No. 134, pp. 216-217. 
> 
it 2 c 
os 
