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The Army-worm. 435   Q
: 1
Ilia; sime numbers. _They avoid observation by still another habit:  
331,5, H s the longitudinal stripes become visible on the body they l1e  
sited at along the lower blades of grasses, from which they gnaw the j‘ -;
Bscm green substance 1n patches. lNumbers weregsometnnes observed  
TOMS ly1ng thus 1not1onless on-the same blade. Their obscure green {LQ
mths general hue, together with the faint striped, renders ~them diffi-    
mood cult of detectron, and one must be on lns guard against throw- 1;,,
1ng them out with old grass when supplying tll€1ll with food,  
HEY- because of the closeness- Vllfll wlueh t·ey approximate the l-egg
thélt str1ate surface of a grass blade. All throi gh their early growth  
they they feed upon the lower blades of gra ses and conseguently  
mm] do. not attract attention. But as they a gproach maturity and  
Icing this source of food becomes exhausted they climb higher and  
— higher up the stems to feed on the morllz exposed blades. The  
and blades of timothy are made ragged by 'heir gnawing, and ulti-  
'lO`GS · · isk
iihé mately disappear 1f the worms arc r ry common. In many  
` » cases the- heads are guawcd off entircl ’. llut the actual work  
I is done at night, the worms still retairiing their retiring dispo-  
lm; it ' sition. Quite often severe injuries tfo grassland are inflicted  
[ the _ by these hidden worms while the owner is unaware of the source  
Egg; l` of the mischief. - ·   l _ l 
` The army-worm feeds much like rtworms, during ordinary 2 
the seasons. The marching habit dcveldbs only under exceptional · 
ld It conditions. When for some reason,} conditions in an infested  
7 be- area become unsuiterl to them, they lose their timidity, come  
out into the sunlight and push forivard with little regard for  
TOWH obstructions and with no apparent concern because of exposure  
gmt- to their enemies. J  
zntly ;  
with _`  i
and msecr Eixuamnas. I 
ater- /
  Their enemies are indeed very active at such times, Hllfl it  __ 
is is reasonable to suppose contribute by their persistent attacks  
.GSiS’ to tl1e frenzy shown by the worms during these periodical stain- "  
G m · pcdcs. A parasitic Hy is particularly active in following up  
mma · - -1 the exposed worms, and leaves its shining elongate oval white  
jlacg egg sticking to the skins of a large proportion. At times fully  
Only three-fourths of those collected for rearing proved infested and  
adgs failed to produce moths. The parasite reared by me {lVin-  
1- in Hienzia 4—]u1st·11Zata) is a fly of the family Tachinidae, well  
1
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