44 
dashes between the third and fourth rows of spots on each side 
and alternating with them. Beneath, the whole body is immaculate. 
The eyes are red, and the antenne fuscous-yellowish, with darker 
tips to the joints. The wings are hyaline, with the cubitus yellow, 
and the other veins dusky. The legs are yellow, except the tips of 
the tarsi, which are slightly darkened. The body of this form 
averages 1.8 mm. in length by .7 mm. in greatest width. The wing 
is 2.3 mm. in length. ‘The anterine are a little shorter than the 
body, measuring a trifle over 1 mm. in length, and the joints are 
proportioned as in the wingless female. The antennal hairs are 
also similarly distributed, but are very much less conspicuous, the 
antenne appearing naked unless examined under a rather high 
magnifying power. The head, thorax and abdomen are ornamented 
with spinous tubercles much as in the wingless female, the head 
and thorax bearing six rows, and the abdomen ten. The body 
beneath is slightly pubescent, and the beak is very short, hardly 
reaching to the cox of the second pair of legs. 
LIFE HiSTORY. 
The original discovery of this species in sorghum fields, in July, 
at Champaign, has already been mentioned, together with the stages 
in which it occurred at this season. On the 31st of July, it was 
still in the same condition on the sorghum, and was also noticed 
sparingly on broom-corn. On the 11th of the following month, in 
McLean county, it was found in all stages on the lower leaves of 
the sorghum; but in October a protracted search in the fields at - 
Champaign, which had previously been infested by it, failed to dis- 
cover a single specimen, and it has not been seen since in any situ- 
ation. Its life history in autumn, winter and early spring is, there- 
fore, unknown. 
INJURIES. 
In both sorghum and broom-corn fields visited at Champaign, the 
principal damage from which the plants were suffering had evi- 
dently been done earlier in the season, and it was consequently 
impossible to tell precisely how much of this injury might be due 
to the plant-lice which were then on the leaves, and how much to 
some cause not then apparent. The deadening of the lower leaves, 
however, must, without doubt, be charged to this insect, as it was 
strictly coincident with the presence of the lice. From two or three 
to six or eight of the largest leaves were brown and shriveled where 
the Chaitophorus was most abundant, and one or two more were 
often reddened and partly dead. HKven upon those leaves which 
had been almost completely killed, patches of these plant-lice were 
still to be seen, as if reluctant to quit their hold until the last drop 
of sap had been extracted. 
In these same fields the corn plant-louse was commonly present, 
but this was as closely confined to the upper part of the stalk, 
being, usually concealed within the rolled bases of the topmost 
leaves. 
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