AGRICULTURAL EXPERIMENT STATION. 



121 



I 



ully watched for the next two seasons, and if it shows a tendency 

 to increase and spread, concerted action should be taken to 

 exterminate it. That the insect may be known when seen, we 

 give below a condensed description of it in the various stages of 

 its life history and also cuts of the eggs, larva, pupa and moths. 



Desceiption. 



Eggs — nearly globular, a little flattened at the base, with a 

 slight depression at the top and a series of depressions running 

 from this depression to the base ; diameter .025 inches ; color pale 

 straw. The moths are said to be capable of laying five hundred 

 eggs which are placed singly upon the leaves by the first brood, 

 and upon the silks and husks at the top of the ear by the later 

 brood. The time required to hatch is supposed to be from two 

 days to a week. Two views of the eggs magnified are shown in 

 Fig. 4, a and b. 



Larva — length 1.5 

 inches when full- 

 grown ; color vari- 

 able, some being 

 pale brown, striped 

 with darker brown, 

 others pale green 

 striped with darker 

 green. There is a 

 dorsal brown band 

 bordered b}' a nar- 

 row light line fol- 

 lowed by a darker 

 band that reaches 

 to just above the 

 breathing pores 

 (stigmata) while the 

 stigmata are in a light area that extends to the ventral surface 

 which is of the general body color. On each segment are eight 

 shiny black spots from which arise brown hairs. The four black 

 spots on the back of each segment are arranged in the form of a 

 trapezoid, with the parallel sides transverse with the body, the 

 shortest side toward the head. The two black spots on the sides 

 are just above the stigmata, one above and in front, the other 

 backhand on a line with them. Head and legs brown, shield on 



