12 PARASITES OF THE COTTON BOLL WEEVIL. 
tory force. Messrs. Hinds, Bishopp, Crawford, Cushman, Jones, 
Morgan, Pratt, and Yothers were engaged at various times in the 
collection of infested material and the more important work of 
examination. Upon their accuracy of observation the finding of 
the parasites was dependent, and to them belongs credit for the 
amount of figures herewith presented relating to the percentage of 
parasitism. A careful tabulated record was kept of all stages of 
the weevil, alive or dead, and all parasites were isolated in tubes. 
Kach- polleeamns lot acest a number and each individual a sub- 
number, and its stage and the nature of its parasitism were recorded. 
As each parasite matured the record was placed opposite its number, 
and the insect was either used in experiments or laid aside for the 
collection. In this manner there could seldom be an error as to the 
nature of the parasitism, as all evidence was in the tube. 
RECORDS PRIOR TO 1906. 
In previous years no regular method of making the parasite rec- 
ords was in use, and consequently there is difficulty in the comparison 
of the former conditions with those now prevalent. In some cases 
the percentage was obtained from the breeding records only, and 
at other times by an examination for the total number of stages 
present. 
In 1902 three observations were made between July 31 and August 
11 at Calvert, Guadalupe, and Victoria. The figures obtained 
included only bred stages, omitting consideration of stages killed by 
heat, fungi, ants, crushing, etc. 
In 1903 Dr. A. W. Morrill first pointed out in his notes that para- 
sites occur in dry hanging forms,? and also in bolls. No other 
mention of the former condition can be found prior to 1906. Only 
two observations were made, both being at Victoria, in June. 
In 1905 four examinations of bolls were made during March, at 
Calvert, Palestine, Runge, and Victoria, in order to ascertain- the 
condition of hibernating stages. These examinations consider the 
total number of stages found hibernating in the bolls. The figures 
are important, as they prove that the parasites also hibernate in bolls. 
During August of the same year nine examinations were made at 
Gurley, Quinlan, Victoria, and Waco. These figures were obtained 
from fallen forms and included the total number of stages in the 
forms. 
In 1902 and 1903 the figures obtained must give a higher per- 
centage of parasitism than actually occurred, as no account was taken 
of the stages dead from other causes. It is also very unsatisfactory 
to take the entire percentage of parasitism in all forms on account 
aThe ap of a ms”? ae been used to designate a mixture of squares and bolls. 
