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 shooting forth of the so-called 
“brace-roots,” which serve to anchor the top-heavy stalk more firmly in _ 
the earth. 
a 
2 
‘ ha 
SYNOPSIS OF INJURIES TO THE ROOTS, AND ORDER OF a 
DISCUSSION. 
1. Roots deadened, hardened, or dwarfed, without apparent loss of | 
substance. Page 48. 
a. Small brown or yellowish ants abundant in the hills, and 
bluish green or whitish root lice on the larger roots. 
Page 48. 
Plant Lice and Mealy Bugs: Page 48. 
Aphis maidiradicis (‘The Corn Root Aphis). (Plate 
VIL, Fig. 5 and 6; and Plate VIIL., Fig. 1-5.) 
Page 50, 
Schizoneura panicola (‘The Grass Root Louse). (Plate 
VIN., Fig. 6; and Plate 1X., Fig. 1:) — Page Ya: 
Trama erigeronensis. (Plate IX., Fig. 2.) Page 82. 
Forda occidentalis. (Plate IX., Fig. 3.) Page 84. 
Tychea brevicorns. (Plate IX., Fig. 4.) Page 86. 
Geovca eee (Plate IX., Fig. 5 and 6; and Plate 
X., Fig. 1, 2, and 3;) Page 87 
Rhizobius spicatus (The W oolly Grass Root Louse). 
(Plate X.,. Fig. 4.) Page 92. 
Dactylopius ‘sorghiellus (‘The Corn Mealy Bug). (Plate 
X., Fig. Y-and:8.) Page 94. 
Ants: Pages 57 and 72. 
Solenopsis debilts. (Plate II., Fig. 2.) Page 57. 
Myrmica scabrinodis lobicornis. (Plate I. and Plate IL., 
Fig. 1.) Page 5%. 
Lasius mger. Page 72. 
Lasius niger alienus. (Plate X., Fig. 5 and 6; and 
Plate XI., Fig. 1.) . Page 72. 
Lasius interjectus. Page 57. 
Formica schaufusst. (Plate XI., Fig. 2.) Page 57. 
Formica fusca. Page 57. 
b. No notable number of insects present. The lowest roots ddentk 
surface of underground part of stalk with brownish 
corroded spots, interior of this part darker, at least at 
the joints, while the spaces between may be seemingly 
healthy. (Root blight of corn, a bacterial disease; not 
entomological.) Page 45. 
