228 



LEPIDOPTERA 



oats, corn, etc., when they may occasion considerable loss. 

 In oat and wheat fields the>' may simply cut off the heads. 

 The life-cycle of the species is somewhat varied. It has heen 

 reported as passing the winter in various stages — egg, larv?e 

 and pu})iTe. The moths appear in the summer and eggs are 

 deposited in late summer or in autumn and probably a good 

 many of the individuals pass the winter in the egg stage. 

 Others become practically grown and then secrete themselves 



Fk;. 178.— The ai 



Hvliiipliila unipiiiictii) : «, full-ffrown 



vvDiiu ynciiupiKiii uiti piuu in ) : (i, iuu-}z;ii>" ii army 

 vorm; b, enlarged view of front of head; c, parent moth; d, eggs in natural 

 position on grass leaf; e, pupa; c, d, e, about natural size; a, enlarged 

 about one-third. (Rearranged after Chittenden, Bull. 29, Div. Ent., and 

 Conistock, Report nf I'. S. Ent. for INTO.) 



under the surface of the ground and hibernate. Others may 

 reach pupal stage and still others may reach adult stage 

 before winter. The great majority of the larval forms reach 

 their matiu-ity during May and June, and the greatest 

 devastation usually occurs during the latter part of June 

 and early July. Eggs are always laid in grass land and the 

 larva? begin their growth in the grass. One brood is 

 apparently the rule throughout the northern Ignited States, 

 and the difference in the stages obser\e(l diu'ing the year 



