T. ater group

Very large species (19–27 mm), body entirely black, at most last two abdominal segments and genital segment reddish (Fig. 23). Head with interior ocular puncture situated close to inner margin of eye (Fig. 25), ocular groove between interior ocular puncture and inner border of eye very short and shallow (Fig. 25), temples with two small contiguous setiferous postocular punctures situated in small impression (Figs. 25, 65), labrum lobate (Fig. 66).