Diponthus festivus Gerstaecker, 1873

(Figs. 3e, f, 6g, 7a, b, 8f, 9a, b; 10f, 11f, 12a, b, and 13).

Diponthus festivus Gerstaecker, 1873: 193 (syntype, male, Brazil, Rio Grande do Sul, Porto Alegre, ZMHB Berlin Mus.); Pictet and Saussure, 1887: 371; Rehn, 1913: 335; Carbonell et al. 2023; Cigliano et al. 2023.

Diagnosis. Pronotal disk black with a narrow band along the mid-longitudinal dorsal carina, two wide oblique bands in prozona surpassing the main transverse sulcus and a wide band on posterior margin yellow colored (Fig. 7a, b); lateral lobes with a narrow band on the inferior margin yellow (Fig. 7a). Tegmina light green with longitudinal and transverse veins greenish-yellow, delimiting regular cells with central spots grayish-brown (Fig. 8f). Hind wings bluish with the apex grayish-brown. Epiproct quadrangular; prominent tubercles on posterior half; furculae small, acute (Fig. 9b). Cerci short, slightly down-curved (straight dorsally and with a slight concavity ventrally) reaching the tip of epiproct (Fig. 9a). Phallic complex similar to D. cribratus . Dorsal valves of aedeagus moderately thin, basal two thirds straight, with the apex slightly down-curved (Fig. 10f); valves of cingulum placed perpendicular to the dorsal valves of aedeagus (in dorsal view), rod-shaped (Fig. 11f). Cingulum V-shaped; zygoma wide, anterior margin straight (Fig. 11f). Epiphallus with lophi placed parallel to bridge, expanded but not reaching the posterior processes of the lateral plates (Fig. 12a); superior edges somewhat rounded in frontal view (Fig. 12b).

Redescription and chromatic characters, and material examined. See Appendix 1

Measurements (in mm). Body length: male: 37; females: 47.1 (45–48.5). Hind femur length: male: 11; females: 19.3 (19–20). Tegmina length: male: 26; females: 34.3 (34–35).

Distribution. This species is found in Argentina (Misiones), Brazil (Rio Grande do Sul) y Paraguay (Itapúa) (Fig. 13).