Macropygium graziae Silva & Campos, sp. nov.

(Figs 2C–D; 4M–P; 5J–L, W–Y; 6D; 7D; 13; Table 1)

Holotype. Male. Labels: LA PAZ (Dep. San Javier) / Córdoba. / 1-20. I. 1929. C. Bruch (MACN).

Paratypes. ARGENTINA, Buenos Aires, Buenos Aires, 1♀ [-34.599, -58.381] (MACN); Córdoba, La Paz, 2♀, 1928 (MACN); Corrientes, Alvear, 1♀, 1991 (DAR); Entre Rios, 4♀, 1996 (JEE); 1♀, 1991 (DAR); BRAZIL, Santa Catarina, Urussanga, 2010 (UFRG) [-28.499, -49.292] ; Rio Grande do Sul, Guaíba, 5♀, 1♂, 1974 [-30.113, -51.325] (1♀ MCNRS, 4♀, 1♂ UFRG); Taim, 2♀, 1982 (UFRG) 1♀, 1985 (MCN) [-32.538, -52.540]; Pelotas, 1♀, 2005 (UFRG) [-31.624, -52.332] .

Etymology: the species is named in honor to Jocelia Grazia, for her friendship, guidance, and contributions to the taxonomy of Neotropical pentatomids; noun in apposition.

Distribution: Brazil, Argentina (Fig. 13).

Diagnosis. Antennae four-segmented, length of the second antennomere equals the third and fourth antennomeres combined; lateral projection of dorsal rim of pygophore broad and apart from the posterolateral angle; middle portion of posterior margin of valvifers VIII projected over laterotergites IX, lateral angles not projected.

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Male. Genitalia: conical projection of ventral rim of pygophore bifurcate at apex; posterolateral angles acute, medial projection of posterolateral angles broadly rounded and tumescent, almost attaining the dorsal limit of segment X in lateral view; lateral projection of dorsal rim large, subtriangular, apart from the posterolateral angle, and partially covering the medial projection in lateral view; segment X higher than wide in posterior view, and longer than wide in ventral view (Fig. 4M–P); parameres short, apical projection broad with a second apical process (Fig. 5J–L), largest axis of head less than half the length of stem; vesica without lateral projections; ductus seminis distalis thin, helicoidal in the middle portion (Fig. 5W–Y).

Female. Genitalia: Valvifers VIII partially covering the basal portion of laterotergites IX; middle portion of posterior margin of valvifers VIII projected over laterotergites IX, lateral angles not projected; laterotergites IX with mild lateral depression (Fig. 6D). Folds of valvulae IX occupying almost half the valvulae surface, with few villi, conical microsculptures barely visible; ring sclerites diameter equals the width of vaginal intima, weakly sclerotized and connected to the thickening of vagina intima, this weakly sclerotized; orificium receptaculi about 2/3 the width of vaginal intima (Fig. 7D).

Comments. Macropygium graziae occurs in southern Brazil and northern Argentina (Fig. 13), partially overlapping with M. reticulare and M. spinolae . Macropygium graziae can be distinguished from all Macropygium species by the four-segmented antennae; by the lateral projections of the dorsal rim of pygophore broad and placed apart from the posterolateral angles of the pygophore (Fig. 4O); and by the middle portion of the posterior margin of valvifers VIII projected over laterotergites IX (Fig. 6D).