William J. Webb, Everett D. Cashatt, and David H. Bohlen
Four New Dragonfly Records in Illinois: Cordulegaster diastatops (Selys), Erythrodiplax connata minuscula (Rambur), Celithemis verna Pritchard, Celithemis monomelaena Williamson (Odanata: Cordulegastridae, Libellulidae)