Angled Sulphur (Gonepteryx Maerula). Digitally enhanced from our own publication of Moths and Butterflies of the United… https://www.rawpixel.com/image/403494/free-illustration-image-butterfly-high-resolution-prints-vintage-animalFree Image from public domain licenseWhite Angled-sulphur (Gonepteryx Clorinde). Digitally enhanced from our own publication of Moths and Butterflies of the… https://www.rawpixel.com/image/403497/free-illustration-image-butterfly-denton-moths-and-butterflies-usaFree Image from public domain license