i. Juga distinctly prominent at the apex and often acute or subacute; fore femur distinctly thickened; hemelytra usually not reaching the apex of the abdomen. Fitchia aptera, N. Y., south and west; F. spinosula, South; Rocconata annulicornis, Texas, etc.
ii. Juga when prominent, obtuse at apex; eyes full width of the head; fore femur not thickened; pronotum with four spines on posterior lobe. R. taurus, Pa., south and west Repipta Stäl.
hh. Pronotum unarmed on the disc.
i. Spines on each apical angle of the penultimate abdominal segment. A. cinereus, Pa., and south. Atrachelus A. et S.
ii. Apical angle of the penultimate abdominal segment unarmed. Fitchia (in part); Castolus ferox, Arizona.
ee. Sides of the mesosternum with a tubercle of fold in front at the hind angles of the prosternum; first segment of the beak longer than the part of the head cephalad of the eyes.
f. Fore femur thickened, densely granulated; hind femur unarmed.
g. Fore tibiæ each with three long spines on the ventral side. S. diadema ([fig. 159e]), a widely distributed species; and several southwestern species. Sinea A. et S.
gg. Fore tibiæ unarmed. A. multispinosa, widely distributed; A. tabida, Cal. Acholla Stäl.
ff. Fore femur unarmed, rarely a little thickened, a little granulated.