50 
REMEDIES. 
In respect to treatment it is too early to make any recommend* 
lions as effective measures can be taken against tins pest only whei 
ks “life history is fully understood. It is c ear as a resu. t ot n.au; 
observations made by us m all parts of the State during the las 
two years, that ground which has been previously in corn, or grass 
is far more liable to injury by the corn-louse than if it has been pie 
viously in small grain. There is, therefore, every probability that i 
judicious rotation of crops will be found to impose a-sufficient chec. 
upon the multiplication of this insect, when its life history is know] 
in full. 
Siphonophora, sp. 
In sorghum fields at Champaign, on the 25th of July, I notice 
upon the leaves of Panicum a few specimens of a p ant-lou s:einit 
I had not previously seen, being associated there with Chaitoplim 
Jlavus, and occurring upon the same plant. It was dearly a t 
phonophora, but although a. considerable numbe of pup® we 
obtained, I secured only a single winged specimen, the wings 
which had been crumpled by accident. I unfortunately neglected 
make notes of the colors while fresh, and am therefore unable 
determine definitely the species, but will give here only so much . 
a description of it as is necessary to distinguish it from the otto 
plant-lice occurring in these fields. It was again found upon tl 
leaves of sorghum, and likewise upon the tops of the same plan, 
on the 11th of August but all the specimens obtained at th 
time were wingless females and pupae. 
Wingless female.—The wingless female is regularly ovate m fori 
the body being 1.8 mm. long by .7 mm. wide. The antennae > 
not quite reach the tip of the abdomen, and measure 1.1 mm. 
length. The honey-tubes are black, long, prominent tapering Ire 
the base, minutely roughened, and extend beyond the tip of t 
abdomen, measuring 8 mm. in length. The tail is prominent, neai 
cylindrical in form, broadly rounded at the tip, one-lialf tlie leng 
of the honey-tubes, and about one-third as long as wide. Ihe lL | 
ment of the antennae is unusually long, measuring more than ore 
third the entire length of the antennae. 
Papa.—The body of the pupa is about 1.5 mm. long by .75 mj 
wide, and the antennae are .9 mm. long. The filament of the sn 
joint is more than twice as long as the third, the basal part or t; 
joint being about half the fifth. The fourth and fifth, ai_e neal 
equal, the latter a little the longer. The honey-tubes are similar 
those of the wingless female, and measure .17 mm. in length, 
terminal joints of the antennae are black, and the others pale, I 
thighs are dark, the tibiae pale, except at the tip, and the taj 
dusky. 
Winged female .—Of this form I can only say that the antenj 
are slightly longer than the body (nearly 1.5 mm. m length), at 
that the filament in the specimen measured was .6 mm. long. J 
wings have the structure of the genus Siphonophora, thiee dis| 
yeins, with the third twice forked. 
