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it from this genus. It is possible it belongs to Passerini’s genus 
Sip ha in which I have placed it provisionally; but I am inclined to 
believe it a true Aphis , notwithstanding the remarkable variation in 
the antennre. * 
Si ph a m a yd is. Pass. 'The Corn or Maize Sipha. 
I am not aware that this species is to be found in the United 
States; but as it is observed to infest our great staple, Indian corn, in 
Italy, it is possible that it may also infest it in the southern states. 
Wingless viviparous female. Ovate convex; above dusky and pale, 
and pilose; below dusky and red and smooth; antennre a little longer 
than the thorax, yellowish, fuscous at the base and apex. Legs dull 
yellowish; tarsi dusky. 
Winged viviparous female. White and black above; fuscous be¬ 
neath; wings opaque white, veins white. 
Occurs on the underside of the leaves of maize or Indian corn, and 
some other plants as sorghum, etc. 
Sub-kami i y PEMPHIGINuU. 
This sub-family differs from the preceding one in several important 
respects, both as to character and habits. It also contains within it 
several sub groups or sections, differing from each other as widely as 
do the divisions of the sub-family already considered, in fact each 
genus given in the preceding synoptical table forms a distinct sec¬ 
tion. 
Buckton, relying upon the wing characters as his guide in dividing 
the family, has separated this group into two sub-families; but I have 
preferred to follow, in the main, Passerini’s arrangement, modifying it 
by the introduction of a genus he has placed elsewhere, which neces¬ 
sitates the modification of the characters he has given. 
The characters of the group as now given will be as follows: Front 
wings with three discoidal veins; the third in some genera once fork¬ 
ed, in others simple: the hind wings in some genera with two branch 
veins, in others with but one. As a very general rule the wings are 
erect in repose, but in a few species they rest horizontally on the ab¬ 
domen. Some of the gall inhabiting species, when first taken ont of 
