Trigoniophthalmus s. str.

Diagnosis. With 2 + 2 exsertile vesicles on abdominal segments II–V. Spine-like setae on the ventral surface of tarsus absent.

Description. Body length 8–12 mm. Hypodermal pigment on head and coxae. Compound eyes black, slightly widened. Paired ocelli black, submedian, close together, transverse, drop-shaped. Spine-like setae on the ventral surface of tarsus absent. Urocoxites II–V with 2 + 2 exsertile vesicles. Ovipositor shortened, not exceeding posterior angle of coxite IX, with 18–22 divisions. Anterior gonapophyses with long setae, divisions of posterior gonapophyses without setae (Figs 5–8).

The subgenus includes one described species (Table 1).