344 
JOURNAL OF ECONOMIC ENTOMOLOGY 
[Vol. 16 
The finer granulations were disregarded because they would be finer 
than the weevil eggs, consequently the only chance for the eggs to 
survive would be in the coarser granulations. PI. 4, fig. 1 is a photograph 
of a weevil egg surrounded by granules of number two semolina. 
The semolina together with the unmilled sample was returned to the 
Minnesota Agricultural College. The same precautions for protecting 
the material from the cold were observed as before and the average 
temperature of the semolina was 61.2° F when it arrived. The weevils 
in the check samples of unmilled wheat were alive and active. 
On February 17th, 1922, 150 pounds of the semolina was made into 
macaroni as will be described later. 
The second milling experiment was performed in a small laboratory 
mill in the Division of Agricultural Biochemistry at the University of 
Minnesota with a peck of the sample of wheat which had been retained 
as a check. This wheat was infested with more weevils from time to 
time until March 30th. At this time the wheat contained all stages of 
the weevil; the eggs, larvae, pupae, and adults ready to emerge. Ten 
wheat berries were selected, each of which contained an egg, and these 
were milled separately. The peck of wheat was milled first and small 
samples of material were removed after each grinding to determine to 
what extent the various stages of the weevils survived. This was to 
determine whether or not the wheat berries had a tendency to fracture 
along the egg cavity. Since the possibility for the survival of the egg 
depends upon the granules breaking off in such a way as to include the 
eggs within them, a tendency for the wheat berries to fracture along the 
egg cavities would greatly reduce the possibility for the eggs to survive. 
In the larger sample, it was found that over 50 per cent of the adult 
weevils survived the first set of rolls. An examination of the material 
from the 10 berries showed that only two of the egg cavities could be 
located and these were in the bran. In one case it could be seen that 
the inner part of the wheat berry had broken along the egg cavity and 
the egg could not be found. 
No living stages of the weevils were found in the middlings from the 
first separation although there were many broken parts of legs and other 
structures of the adult beetles. After the second break a few living 
weevils were found but after the third break there were no survivors to 
be found. Samples of material were kept and examined from time to 
time, but there was no evidence of living eggs. 
From the above it is shown that no stages of the weevil survived the 
