Description of a new species of Sphingidae from the USA, Sphinx vanbuskirki n. sp., and confirmation of the synonymy of Sphinx coloradus Smith, 1887 with Sphinx dollii Neumoegen, 1881. Lepidoptera, Sphingidae, Sphinginae. European Entomologist, 12(1), May 13 2020: 21-36. 26 [Zoological Record Volume 160]