Charles Valentine Riley, an American entomologist, born in London, England, Sept. 18, 1843. At 17 he came to America, and after farming for three years was for nearly five years editor of the entomological department of the " Prairie Farmer " at Chicago. In 1868 he was made state entomologist of Missouri, and has since then made annual reports on its insects. In the same year he began with Benjamin D. Walsh, state entomologist of Illinois, the "American Entomologist," a monthly magazine. Among the more noteworthy results of his labors are the tracing of the history of the Colorado potato beetle (1863); the discovery of a 13-year brood of the 17-year or periodical cicada (1868); the discovery of the grape phylloxera in American vines, and of its identity with the destructive insect of southern France (see Phylloxera); the recommendation to use diluted Paris green against the Colorado potato beetle (1871) and the cotton worm (1873); and the discovery of the yucca moth (pronuba yuccasella), by which the North American yuccas are fertilized.

In 1873 he was presented with a grand gold medal by the French minister of agriculture and commerce "for services rendered to French grape culture".