ied. During the present season the following species have 
ound noticeably injurious to this crop in Illinois: 
Red-Legged Grasshoppers, Pezotettix femur-rubrum, DeG., and 
nis, Riley. The most evident injury to corn done by these species 
came to my knowledge, was that reported by Dr. F. W. 
y. In a letter dated August 29, he says: “For the first time 
r life I have this summer seen damage done to crops by 
?. The corn bordering on grass lands has been considerably 
i, causing the ear to be small and undeveloped. They ate 
ives, husks, tops and ends of the ears. The injury was done 
! femur-rubrum and atlanis; also many narrow winged ‘katydids’ 
vith them.” [Probably Orchelimum vulgare.'] 
dium americanum, Drury.—In Union and Perry Counties, in 
nber this great bird grasshopper (so closely related to the 
ian locust as to startle one as he notices its abundance in ex- 
Southern Illinois), was occasionally found doing considerable 
je in the borders of cornfields, sometimes completely stripping 
xlks of leaves. It never swarms, however, and has not the 
;d power of migration of its relative, and has hitherto done no 
3 injury. 
! >ptenus differentials, Thos.—This species, one of our most 
ant, was the commonest grasshopper in cornfields in Southern 
3 this fall, feeding not only on the leaves, but on the corn at 
) of the ears, and sometimes gnawing down the side of the 
I 
lelimum vulgare, Harris.—In some situations this common grass 
was about as abundant as Caloptenus differentials, and sim- 
injurious. 
Contribution to the Life History of the Corn Plant Louse. 
(Aphis maidis, Fitch.) 
Order Hemiptera. Family Aphiddle. 
By H. Garman. 
knowledge of this insect is made up of scattered contributions 
have been made from time to time since the year 1856, when 
sa Fitch, in his second report on the noxious, beneficial and 
i insects of the State of New York, named the insect and de- 
d the aerial form. At the time his report was written, Dr. 
had seen only the larva, wingless female, pupa and winged 
3 of the aerial form, and these were supposed by him to occur 
j ipon the peduncles of corn ears. 
B. D. Walsh next discovered the root form and described its 
apterous female, pupa and alate female (Proc. Ent. Soc. Phil., 
land Trans. Ill. State Ag. Soc., 1865). He mentions the fact 
bis form is attended by small ants. 
lis list of the plant-lice of the United States, published in 
in 2 of the Illinois State Laboratory of Natural History, 1877, 
^rus Thomas adds to our information the statement that the 
i form occurs on the corn silks as well as on the ear-stalks. 
