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| Acronym | Institution Name and Location |
| [AMNH] | American Museum of Natural History (New York, NY, USA) |
| [ANSP] | Academy of Natural Sciences Philadelphia (Philadelphia, PA, USA) |
| [BMNH] | British Museum of Natural History (London, Great Britain) |
| [CMNH] | Carnegie Museum of Natural History (Pittsburg, PA, USA) |
| [CSU] | Gillette Museum of Arthropod Diversity, Colorado State University (Fort Collins, Colorado, USA) |
| [IBUNAM] | Instituto de Biología, Universidad Nacional Autónoma de México (Mexico City, Mexico) |
| [LACM] | Los Angeles County Museum of Natural History (Los Angeles, CA, USA) |
| [MGCL] | McGuire Center for Lepidoptera and Biodiversity, Florida Museum of Natural History, University of Florida, (Gainesville, FL, USA) |
| [MNHN] | Museum für Naturkunde der Humboldt Universität (Berlin, Germany) |
| [MNHU] | Muséum National d’Histoire Naturelle (Paris, France) |
| [MZFC] | Museo de Zoología, Facultad de Ciencias, Universidad Nacional Autónoma de México (Mexico City, Mexico) |
| [SDMNH] | San Diego Museum of Natural History (San Diego, CA, USA) |
| [USNM] | United States National Museum [of Natural History], Smithsonian Institution (Washington, DC, USA) |

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Wing venation of Pontia protodice. Image from: Comstock, J. H. 1918. The wings of insects. The Comstock Publishing Company, Ithaca. 430 pp. p. 333, f. 342 |

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Skipper Wing venation and the structure of antenna. Image from: Steinhauser, Stephen Rogers 1981. A revision of the proteus group of the genus Urbanus Hübner. Lepidoptera: Hesperiidae. Bulletin of the Allyn Museum 62: 1-41, 61 figs. (4 September). f. 1 |

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Grass and Giant Skipper wing venation. Illustrated using Megathymus cofaqui, FLORIDA: Levy Co. Veins names are shown in black, Cell names are shown in white. Image © Nick V. Grishin. |

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Skipper wing venation in British system. Image from: Evans, William Harry 1949. A catalogue of the Hesperiidae from Europe Asia and Australia in the British Museum (Natural History) xix + 502 pp. |

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Male genitalia. We do not know the source of this image. Please inform us if you do. TIA. |

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Structure of a valva in Urbanus and related skippers. Right valva, interior surface, view from the side. Iamge from: Steinhauser, Stephen Rogers 1981. A revision of the proteus group of the genus Urbanus Hübner. Lepidoptera: Hesperiidae. Bulletin of the Allyn Museum 62: 1-41, 61 figs. (4 September). f. 2 |

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Female genitalia of Urbanus and related skippers. View from below. Image from: Steinhauser, Stephen Rogers 1981. A revision of the proteus group of the genus Urbanus Hübner. Lepidoptera: Hesperiidae. Bulletin of the Allyn Museum 62: 1-41, 61 figs. (4 September). f. 3 |
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