Difference between average proboscis length and average fruit size (i.e. proboscis length - fruit size) for Leptocoris mutilatus and Cardiospermum populations in KNP. Green bars represent populations in which soapberry bugs are well-suited to feed on their Cardiospermum hosts (i.e. proboscis length > fruit size) and red bars represent populations in which soapberry bugs are poorly matched (i.e. proboscis length < fruit size).