43 
but if this character be insisted on, the present species must be ex- 
cluded from this genus, and placed in a new one to be erected for 
its benefit, distinguished by antenne with but ‘‘six” joints (pro- 
perly but five). 
Wingless viviparous female. (Plate III, Fig. 2.) The wingless 
forms of ths species are bright lemon-yellow throughout, varied 
only by four curved longitudinal rows of black points on the back, 
two on each. side the middle line. They are of a regularly ovate 
form, with antenne and legs of medium length; but are especially 
distinguished from our other common plant-lice by the longitudinal 
rows of stout, erect bristles upon the head, and upon the back of 
both thorax and abdomen. ‘These rows of bristles are ten in num- 
ber, each bristle arising singly from a small, pointed tubercle. They 
are also placed in rows transversely, one row to each segment of 
the abdomen. Six additional bristles, rather stouter than the 
others, project conspicuously forward from the front of the head, 
between the bases of the antenne. 
The latter are five-jointed, about two-thirds as long as the body, 
and sparsely hairy or spinose, bearing two stout hairs upon each of 
the two basal joints, four on the third, and one on the fourth. The 
fourth joint is about two-thirds as long as the third, the scape of 
the fifth a little shorter than the fourth, and the filament about 
equal in length to the third. . 
The beak is very short, barely reaching the cox of the second 
pair of legs. 
The honey-tubes have the form of low, truncated cones, not more 
than two-thirds as high as broad; and the tail is prominent and 
stout, about as long as wide. The legs are conspicuously hairy 
throughout, and the ventral segments are also provided with fine 
short hairs. 
The head and body are 1.5 mm. long by .6 mm. wide; the an- 
tenne are 1.5 mm. long, the honey-tubes .1 mm. wide at base, and 
the tail .15 mm. long. 
Pupa. (Plate III, Figs. 3 and 4). This is colored throughout like 
the wingless female; is 1.7 mm. long by .75 mm. wide, the antennz 
being .75 mm. long, and similar in other respects to those of the 
form just described. The body is ornamented with rows of spines, 
as in the wingless female, from which the pupa differs little save 
in the presence of wing-pads. 
Winged female. (Plate III, Fig. 1). This form is of materially 
different shape from those just described ; the thorax being well distin- 
guished from head and abdomen, and of a rounded outline, while 
the abdomen is contracted at base and pointed behind. 
The general color is a pale lemon-yellow, with mesothorax and 
metathorax darker, verging upon brownish-orange. Upon the abdo- 
men are eight longitudinal rows of black spots, and a row of black 
* Aphidide Italice Hucusje Ooservate, pp. 7 and 9. 
+ Monograph of the British Aphides, Vol. IT, p. 8. 
t Eighth Report of the State Entomologist on the Noxious and Beneficial Insects of 
the State of Illinois, p. 103. 
