Beebe W. Migration of Nymphalidae (Nymphalinae), Brassolidae, Morphidae, Libytheidae, Satyridae, Riodinidae, Lycaenidae and Hesperiidae (Butterflies) through Portachuelo Pass, Rancho Grande, North-central Venezuela. Zoologica. 1951;36:1-16. https://www.biodiversitylibrary.org/part/203473