Data for: Secondary nectar robbing by Lycaenidae and Riodinidae: opportunistic but not infrequent

Butterflies have rarely been reported in the literature to engage in secondary nectar robbing (consumption of nectar via slits in the corolla or nectar robbing holes. Here we report on observations of 4 taxa of butterflies that nectar rob from scarlet bugler (Penstemon centranthifolius).