CORN SAWFLY. 21 
form of apparatus in which the grains could be exposed to a regulated 
amount of heat.* But at the present day, method of storage of the 
grain and fumigation appear to be the approved remedies. 
There does not appear to be any reason for fear of the attack of 
« Angoumois Moth”’ establishing itself as a field pest in this country ; 
but as we find that now we are open to its transmission on the broad 
scale of infested cargoes, we may have loss and difficulty in this 
respect, and in cases where the damage only affects the value of the 
Barley slightly for use for malting, probably the best course would be 
to sell the grain as soon as possible for immediate use. 
Corn Sawfly. Cephus pygmaeus, Curtis. 
i 25 . 
Ceruus Pycmmus.—l, 2, Corn Sawfly, magnified, and line showing natural 
length ; 3, infested stem; 4, 5, maggot, natural size and magnified; 6, 7, parasite 
fly, Pachymerus calcitrator, magnified, and line showing natural size. 
The damage done by the Corn Sawfly is caused by the fly piercing 
the growing corn stem with her egg-laying apparatus, and laying an 
egg within, the maggot from which eats its way upwards, piercing 
through the successive knots. When nearly full grown it returns 
downwards, and about harvest time bites a ring round the inside of 
the stem at the ground level or thereabouts, but without damaging 
the outer part of the straw. Having done this, the grub goes yet 
further down into the lower part of the stem, and there it spins itself 
a cocoon, a silken case, in which it passes the winter. 
Meanwhile there may be little in the appearance of the crop to 
draw attention to what is taking place, excepting that the ears look 
* For full details see Curtis’s ‘ Farm Insects,’ pp. 313, 314. 
