truncatus species group

Three species of this group have the dorsoanterior head plate with a prominent medioposterior point (Figs. 10, 14), whereas the fourth species, described here as a new species, has a posteriorly rounded plate (Fig. 16); each side of temple margin with both setae of equal length; each plate of tergite II with long seta at medioanterior corner (Figs. 9, 13); tergites II–V with lateroposterior process intruding into following segment; abdominal sternites slender; male genitalia with short penis overlying characteristic sclerites (Figs. 11–12).