53 
slight, so that the hill may be pulled up too easily. This con¬ 
dition of the plant is due to a loss of roots, usually to be 
attributed to one of the corn root worms, or, more rarely, 
to the white grubs. Sometimes, however, a similar appearance 
is given late in the season to a field infested by the chinch bug, 
which by abstracting sap from about the base of the stalk just 
beneath the surface of the ground will often prevent the shoot¬ 
ing forth of the so-called “brace roots,” which serve to anchor 
the top-heavy stalk more firmly in the earth. 
SYNOPSIS OF INJURIES TO THE ROOTS, AND ORDER OF 
DISCUSSION. 
1. Roots deadened, hardened, or dwarfed^, without apparent 
loss of substance. Page 55. 
a. Small brown or yellowish ants abundant in the hills, 
and bluish green or whitish root lice on the 
larger roots. Page 55. 
Plant Lice and Mealy Bugs: Page 55. 
Aphis maidiradicis (The Corn Root Aphis). (Plate 
VII., Fig. 5 and 6; and Plate VIII., Fig. 1-5.) 
Page 58. 
Schizoneura panicola (The Grass Root Louse). 
(Plate VIII., Fig. 6; and Plate IX., Fig. 1.) 
Page 85. 
Trama erigeronensis. (Plate IX., Fig. 2.) Page 93. 
Forda occidentalis. (Plate IX., Fig. 3.) Page 95. 
Tychea brevicornis. (Plate IX., Fig. 4.) Page 97. 
Geoica squamosa. (Plate IX., Fig. 5 and 6; and 
Plate X., Fig. 1, 2, and 3.) Page 98. 
Rhizobius spicatus (The Woolly Grass Root Louse). 
(Plate X., Fig. 4.) Page 104. 
Dactylopius sorghiellus (The Corn Mealy Bug). 
(Plate X., Fig. 7 ana 8.) Page 106. 
Ants: Pages 66 and 82. 
Solenopsis debilis. (Plate II., Fig. 2.) Page 66. 
Myrmica scabrinodis lobicornis. (Plate I. and Plate 
II., Fig. 1.) Page 66. 
Lasius niger. Page 82. 
Lasius niger alienus. (Plate X., Fig. 5 and 6; and 
Plate XI., Fig. 1.) Page 82. 
Lasius interject us. Page 66. 
Formica schaufussi. (Plate XI., Fig. 2.) Page 66. 
Formica fuse a. Page 66. 
