Attractiveness of sweet shrub flowers, Calycanthus floridus Linnaeus, to species of Nitidulidae was determined from collections made May to mid-July (1991–2004) at the Ohio Agricultural Research and Development Center (OARDC) of the Ohio State University and surrounding areas. A total of 2064 nitidulids were collected, representing 17 species and 9 genera. The most abundant nitidulids collected at OARDC were Carpophilus lugubris Murray (56%), Colopterus truncatus (Randall) (20%) and Carpophilus brachypterus (Say) (15%). The most common nitidulids collected in the surrounding areas were C. truncatus (56%) followed by C. lugubris (28%). The remaining nitidulid species in both areas represented less than 7% of the specimens collected. Our data show a diversity of nitidulid species attracted to C. floridus flowers, with two species accounting for nearly 80% of the nitidulids associated with Calycanthus.