13. a) Hind femur much longer than greatest breadth, with distinct basal spine, hind tibia broadest subapically, expansion smoothly rounded (Figure 23a) ….. Dufourea maura (Cresson)

b) Hind femur robust, half as broad as long, without basal spine, hind tibia greatly expanded to apex, triangular (Figure 23b) ….. Dufourea dilatipes Bohart