Tibraca limbativentris Stål, 1860

(Figs 2–3; 113–116)

Tibraca limbativentris Stål, 1860: 18; Stål, 1867: 26; Stål, 1872b: 30; Lethierry & Severin, 1893: 132; Kirkaldy, 1909: 72; Bosq, 1937: 127; Barber, 1941: 111; Costa Lima, 1947: 312; Pirán, 1956: 32; Ruffinelli & Pirán, 1959: 21; Benvegnú, 1968: 88; Becker & Grazia, 1971: 20; Fernandes & Grazia, 1998: 1052–1054.

Mormidea basalis Walker, 1868: 553 .

Mormidea walkeri Lethierry & Severin, 1893: 124; Kirkaldy, 1909: 72.

Tibraca basalis; Distant, 1899: 438.

Ogmocoris reinigeri Costa Lima, 1935: 16; Silva, 1945: 596; Costa Lima, 1947: 311.

Material studied. Cachoeirinha: 10♂, 8♀, IRGA [Instituto Rio Grandense do Arroz], 05.IV.2000, J. Oliveira leg. (UFRG) . Eldorado do Sul: 2♂, 2♀, 17.IX.1992, J. A. M. Fernandes leg. (UFRG) . Porto Alegre: 1♀, 21.VII.1993, J. Grazia leg. (UFRG) ; 1♂, 27.VIII.1974, Dalmolin leg. (UFRG) .

Diagnostic features. Body dorsal and ventral surfaces castaneous. Head longer than wide. Mandibular plates shorter than clypeus, rounded apically (Fig. 113). Clypeus robust and raised above the mandibular plates. Antennomere 2 smaller than the first. Outline of anterolateral margins of pronotum impunctate and pale yellow, straight (Fig. 113). Internal angles of cicatrices of pronotum with one pale yellow callosity each. Humeral angles slightly developed, acute apically, directed laterally. Apex of radial vein of corium with pale yellow callosity (Fig. 114). Connexivum with dark castaneous macule on anterior angles (Figs 2, 113). Sub-lateral margin of sternites yellow with sparsely distributed punctures. (Fig. 115). Body length: 13.00–16.00 mm (Fernandes & Grazia 1998; Garbelotto & Campos 2014).

Recorded host plants. Rice (Botta et al. 2014; Hickel et al. 2016; Alves et al. 2016; Fuentes-Rodriguez et al. 2019), soybean (Costa & Link 1974; Link & Grazia 1987) and wheat (Link & Grazia 1987). May use as alternate hosts a variety of grasses ( Andropogon lateralis, Eryngium eburneum, Paspalum urvillei, Schizachyrium microstachyum, Tridens brasiliensi s) and, sometimes, maize.

Distribution in Rio Grande do Sul. Cachoeirinha, Capão do Leão, Eldorado do Sul, Guaíba, Itaqui, Pelotas, Porto Alegre, Santa Maria and São Sepé (Fig. 116).

Comments. This species is the most important pest in rice crops in Brazil.