Literature

• Austin, G.T. & Warren, A.D. 2001. Taxonomic notes on some neotropical skippers (Lepidoptera: Hesperiidae): Pyrgus, Heliopyrgus, and Heliopetes (Pyrginae). Dugesiana 8: 1-13.

Literature references linked to higher taxa

• Catalogue of Life. Species 2000 & ITIS. [link] (Papilionoidea)
• Maddison, D. (ed.). Tree of Life web project. [link] (Hesperiidae)