Revision of the genus Tibraca Stål (Heteroptera, Pentatomidae, Pentatominae)

Abstract

The genus Tibraca Stal, 1860 is revised, and some taxonomic changes are introduced. The following species are considered to belong in this genus: Tibraca limba/iven//'is Stal, 1860, T similillla BarbeI', 1941, and T exiglla sp.n. (from Argen-tina). Three other species, fonnerly placed in Tibraca, are considered respeclively: T. obscll/'a/a Bergroth, 1914, inccrtac scdis; Mecocephala fusca (Haglund, 1868), comb.n.; Ogmacoris hypomelas (Burmeister, 1835). The genus Ogmoco/'is Mayr, 1864 is reinstated. KEY WORDS. Heteroptera, Pentatomidae, TibrC/ca, Ogllloco/'is gcn ... cva l., taxo-nomy STÂL (1860) described Tibraca to inclllde T limbalivenlris; he compared it with Mecocephala Dallas, 1852, and emphasized that Tibraca cOllld be distin-guished by the absence of abdominal slllclls. MA YR (1864) established Ogmocoris for Atelocerus hypomelas Burmeister, 1835. HAGLUND (1868) described T fusca based on a male sllpposedly collected in Brazil. WALKER (1868) described Mormidea basa/is; this name however fell in homonymy with Mormidea basalis Walker, 1867. LETHIERRY & SEVERlN (1893) gave the new name Mormidea walkeri for the preoccllpied name M basalis Walker, 1868. KJRKALDY (1909) considered Mormidea walkeri as jllnior synonym of T limbativentris. BERGROTH (1914) described T obscurata based on a female from French GlIyana. BARBER (1941) described T similima from ECllador. SILVA (1945) considered Ogmocoris reinigeri Costa Lima, 1935 as ajllnior synonym of T limbativenlris. COSTA LIMA (1947) established the genlls Ogmocoris Mayr, 1864 as ajllnior synonym of Tibraca . The type specimens of ali species so far known in Tibraca were examined, except for T obscura/a. As mentioned in CAMPOS & GRAZIA (1995), the type specimen of T obscurata is probably lost. Furthermore, Bergroth's description of this species does not permit to place it correctly. Then T obscurata is considered here as "incertae sedis".