1	Postmetacoxal striae of the first ventrite joined in an arch along the anterior margin (Fig. 4A); lateral metaventral stria terminating about one-third metaventral length behind the mesometaventral suture (Fig. 4A); frontal stria descending onto epistoma only, without stria across anterior margin of frons (Fig. 3A); southern Brazil, Paraguay, Argentina	Kaszabister barrigai sp. n.
–	Postmetacoxal striae not joined in an anterior arc; lateral metaventral stria reaching (Fig. 4B, D) or nearly reaching (Fig. 4C) mesometaventral suture; frontal stria variable	2
2	Abdominal ventrites 2–5 lacking posterior marginal stria (Fig. 4D); southern Mexico to Costa Rica	Kaszabister carinatus (Lewis, 1888)
–	Abdominal ventrites 2–5 with posterior marginal stria (Figs 4A-C)	3
3	Frontal stria complete and evenly arcuate across frons (Fig. 3B); epistoma convex; lateral stria of metaventrite reaching mesometaventral suture (Fig. 4B); Peru, Brazil, Uruguay, Argentina	Kaszabister ferrugineus (Kirsch, 1873)
–	Frontal stria not evenly arcuate, descending onto epistoma as a weak marginal carina (Fig. 3C); epistoma depressed; lateral stria of metaventrite abbreviated about one-fourth behind mesometaventral suture (Fig. 4C); southern Brazil, Uruguay, Argentina	Kaszabister rubellus (Erichson, 1834)