Word: morrisi
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Dates: during 1940-1949
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...confirm the last theory Zoologist Robert E. Gregg of the University of Chicago made 33 experiments with 9,537 ants of the species Pheidole morrisi. He arranged for ant larvae to be reared to maturity under the care of soldiers only and of workers only, and found: "Where the soldier caste is present in large numbers, there is a decrease in the number of soldiers that are produced. Conversely, in pure colonies of workers an excess of soldiers tends to appear over the number which normally develop in a control colony...
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