Tetragonoschema ( Tetragonoschema ) rubromarginatum Théry, 1944

Tetragonoschema ( Tetragonoschema) rubromarginatum Théry, 1944 View in CoL

( Figs. 25 View FIGURES 19 – 27 , 51 View FIGURES 46 – 54 , 75 View FIGURES 72 – 81 )

Tetragonoschema rubromarginatum Théry, 1944: 22 View in CoL . Type locality: Argentina, Chaco de Santiago del Estero, Bords du Rio Salado, env. d´Icaño.

Tetragonoschema rubromarginatum: Bellamy, 2008: 1520 View in CoL (catalogue).

Type specimens studied. Number of syntypes unknown; lectotype ( Fig. 25 View FIGURES 19 – 27 ), here designated ( male, MFCB): “ Argentina, Rio Salado [h] // Tetragonoschema cupreomarginatum [sic!] Théry [h] paratype [p]” ; paralectotype, here designated (female, MNHN): “Museum Paris, [ Argentina] Chaco de Santiago del Estero, Bords du Rio Salado, env. d´Icaño, 1910, E. R. Wagner [p] // rubromarginatum Théry [h] Type [p]”.

Further specimens studied. ARGENTINA. CHUBUT: Desembocadura Río Chubut, 20.i.–7.ii.2011, D. Rojas Lanus leg. ( 3 males, MDCS) ; FORMOSA: La Rioja, Alparinche, 30.xii.2002, L. A. Stange leg. ( 1 male, FSCA) ; Mendoza, San Carlos Arroyo, El Yaucha, 1450 m, 21.i.1979, Sergio Roig leg., on Grindelia flowers ( 1 female, MDCS).

Diagnosis. Rather large, length: 5.2–6.5 mm, stout with bicolorous elytra: blue-black or blue-violet, completely margined with red or golden-red; frons with rather long, pronotum with very short, white pubescence; pronotum regularly convex without lateroposterior depressions, elytra flat with deep and wide discal depressions; elytral epipleura wide, reaching elytral suture, easily visible from above; aedeagus very short and stout, parameres with preapical spines ( Fig. 75 View FIGURES 72 – 81 ). In its colouration resembling T. ( T.) cupreocingulatum , T. ( T.) humerale and T. ( T.) trinidadanse but it differs from them strongly in the form of the elytral epipleura, pronotal shape and in the form of male genitalia.( Fig. 75 View FIGURES 72 – 81 vs. Figs. 78, 80, 81 View FIGURES 72 – 81 ).

As the number of syntypes is unknown I hereby designate the male from MFCB as the lectotype and the female from MNHN as the paralectotype of T. rubromarginatum .

Bionomy. A female from Mendoza was collected on flower of Grindelia sp. ( Asteraceae ).

Sexual dimorphism. The female differs from the male only in the larger and stouter body.

Distribution. Argentina

Note. One male from Chubut possesses completely red elytra with a golden margin.