1 Outer or third posterior antennal process rounded and ridge­like; proboscial sheath smooth, except for slight rugoseness posteriorly; thoracic area above wing sheath with yellowish dorsomedian bristle­like spine behind posterior mesothoracic callosity; segment 1 without dorsolateral bristle­like spine on each side; venter of segment 8 with 15 bristle­like spines......................................... Ommatius gemma Brimley

­ Outer or third posterior antennal process apically acute; proboscial sheath smooth with rugose swellings on each side of midline posteriorly and median concave tubercle separated from swellings by narrow ridge of cuticle; thoracic area above wing sheath without dorsomedian bristle­like spine; segment 1 with 1 dorsolateral bristle­like spine on each side; venter of segment 8 with 4 bristle­like spines.............................................................................................................................................................. Ommatius tibialis Say