Genus Gasterophilus is a group of parasitic insects commonly known as botflies. These insects lay their eggs on horses, and when the larvae hatch, they burrow into the skin and cause substantial damage. Synonyms for the Genus Gasterophilus include warble flies, heel flies, and gadflies. These insects are notorious for their parasitic behavior and have been a significant problem for horse owners for centuries. Although there are several species of botflies, the Genus Gasterophilus is the most prevalent, and its synonymy reflects the common knowledge of these insects. Horse owners must be vigilant in protecting their animals from these harmful parasites to ensure their health and well-being.