Largus giganteus sp. nov. from Brazil and notes on hybridization within Largus (Hemiptera: Heteroptera: Largidae) Author Stehlík, Jaroslav L. Department of Entomology, Moravian Museum, Hviezdoslavova 29 a, CZ- 627 00 Brno - Slatina, Czech Republic Author Kment, Petr Department of Entomology, National Museum, Kunratice 1, CZ- 148 00 Praha 4, Czech Republic; e-mail: sigara @ post. cz text Acta Entomologica Musei Nationalis Pragae 2010 2010-06-30 50 1 53 58 journal article 10.5281/zenodo.5323936 0374-1036 5323936 Largus giganteus sp. nov. ( Figs. 1–4 ) Type material. HOLOTYPE : ♀ , BRAZIL : AMAZONAS : ‘Lower Amazonas, Rio Madeira, Manicore’ [no additional data available] (deposited in the Moravian Museum, Brno, Czech Republic ). PARATYPE : J, BRAZIL : PARÁ : ‘ BRAZIL , Para: / Jacareacanga / Aug. 1969 / F. R. Barbosa’ (AMNH). Description. Coloration. Body black. Scutellum, clavus and corium (except base), hypocostal lamina from level of posterior pleural flange III, ventral and dorsal laterotergites red. Posterior pleural flange III and proximal part of ventrite II proximally whitish yellow. Structure. Body large, abdomen high in lateral view. Antennomeres 1 and 4 very long, each longer than antennomeres 2 and 3 combined (see Measurements below). Pronotum anteriorly narrow, strongly widening towards base; lateral pronotal margins nearly straight, not gibbose. Callar lobe slightly gibbose, shining. pronotal lobe regularly convex towards base. Lateral margins of corium arcuately widened, medially much wider than pronotal base. Pygophore ( Fig. 4 ). Ventral rim in lateral view strongly gibbose, elevated above ventral wall; slightly concave medially in caudal view. Ventral rim infolding falling upright into genital chambre. Lateral rim obtuse, only intimated; lateral rim infolding nearly horizontal, merged with dorsal rim infolding without apparent border. Lateral rim infolding behind paramere somewhat depressed and pointed. Figs. 1–4. Largus giganteus sp. nov. 1 – habitus of holo- type, ♀ ; 2–4 – paratype ,J (2–3 – habitus; 4 – pygophore in dorsal view). 1–2, 4 – Photo: L. Dembický; 3 – Orig. A. Luna. Paramere. Apex of paramere projected into sharp point reaching anal tube, positioned nearly square to paramere’s axis. Pilosity. Almost entire body, including legs and antennae, covered by black, medially long hairs, except for silver toment on proximal part of epicoxal lobes I and II. Posterior margin of posterior pleural flange III (especially at base) with pale pilosity. Punctation. Pronotal collar and pronotal lobe with distinct, uniformly distributed punctures. Prominent black punctures on corium concentrated in several patches forming a distinct but individually variable pattern ( Figs. 1–3 ). Punctation less distinct at bases of clavus and corium towards scutellar apex, from there very prominent, with two distinct patches of black punctures medially on corium at level of claval apices (on inner side of median vein), punctures missing only in several patches: on the costal and partly posterior margins of corium, except its (in varying degree) black apex. Measurements (in mm). ♀ ( holotype ) / J ( paratype ). Body length 19.06 / 16.85; head: width (including eyes) 3.02 / 2.86, interocular width 1.78 / 1.78; lengths of antennomeres: 1 – 5.13 / 4.86, 2 – 2.21 / 2.16, 3 – 1.35 / 1.40, 4 – 4.18 / 4.05; pronotum: total length 4.32 / 4.21, width 6.16 / 6.26; scutellum: length 2.27 / 1.94, width 2.81 / 3.51; corium: length 10.80 / 9.61, width 4.32 / 3.94. Variability. There is variability in the pattern of the black punctation on the corium (see Figs. 1–3 ). Differential diagnosis. Largus giganteus sp. nov. differs remarkably from all remaining species of ‘Gruppe I. A’ by its large size, strongly pubescent antennae and tibiae, and unique pattern of black punctation on its pale red corium. Etymology. The species epithet is the Latin adjective giganteus , - a , - um , meaning giant. Distribution. Brazil ( Amazonas and Pará).