Figure 1.

Map indicating sampling locations for Peponapis pruinosa. Dark green area indicates the approximate current distribution of P. pruinosa. Orange area bounds the range of the wild host plant, Cucurbita foetidissima, delimited using herbarium specimens. The stable range of C. foetidissima is smaller, because plants taken from the northern and eastern peripheries (NM and KS) often represent transient dispersal events and not persistent populations. See the electronic supplementary material, table S3 for population codes, geographical coordinates and sample size.