Mule killer

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1.Any of several arthropods erroneously supposed to kill live stock, in the southern United States, by stinging or by being swallowed;
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
In "Mule Killers," the grandfather mourns his mules and the passing of an era, the father mourns the woman he loves, and each grieves for the other's burden.
The collection begins with "Mule Killers," a story that chronicles the summer when tractors were introduced to the farms surrounding Nashville, a change that renders beasts of burden useless.