ENTOMOLOGICAL NEWS. 487 
ns little reason to doubt that these sporadic winged forms 
» leaves of the alder are the return migrants from the 
sple, and that Pemphigus acerifolii Riley is merely the maple 
1 for Pemphigus tessellata Fitch, the stem mother of which 
rates from the bark to the leaf upon hatching in the spring. 
Im accordance with my custom for five years, specimens of 
_ aphids have been saved, for every record made, either in 
balsam mounts or as alcoholic material, so that they are ready 
for reference at any time. During the winter of 1905-06 I 
____ made a careful comparison of all the winged species of Pem- 
phigus taken in Maine up to that time, and was particularly 
___ struck by the fact that mounted specimens of P. tessellata and 
____ P. acerifolii were indistinguishable and made the grumbling 
comment “If these are two species there is no structural basis 
for systematic work with Pemphiginae.” However, there 
_ seemed no place in the tessellata cycle for acerifolii, several at- 
to colonize maple with apterous forms of tessellata were 
‘a unsuccessful and for the next two falls the species was 
es ‘$0 scarce that the migrants were not much in evidence, and 
no clue was forthcoming until this fall. 
- The life cycle of the alder blight is by no means solved by 
_ the location of the sexual generation. The true association of 
_ P. tessellata and acerifolii yet remains to be established upon 
the alder. With the clues now at hand these species (two or 
one) can unquestionably be traced in time. The abundance of 
alder and maple at Orono and the usual presence in great num- 
bers of P. tessellata and acerifolii make it an ideal situation 
for work with these forms and favor my plans for thorough 
study of the Pemphigus upon the alder and maple. 
___ There is no need of crowding with further details from notes 
| now at hand this preliminary paper, the object of which is 
merely to place the sexual forms of P. tessellata for which the 
_ following brief description will suffice. 
a Oviparous female—A pale yellowish form, apterous and 
non-rostrated, measuring 1.33 mm. in length. Antennae of 
= 
