Tetragonoschema ( Tetragonoschema ) barriesi, Bílý, Svatopluk, 2012

Tetragonoschema ( Tetragonoschema) barriesi View in CoL sp. nov.

( Figs. 44 View FIGURES 37 – 45. 37 – 40 , 61 View FIGURES 55 – 63. 55 – 57 , 76 View FIGURES 72 – 81 )

Specimens examined. Holotype ( male): “ Paraguay, Prov. Boqueron, 9.–11.xii.2010, NP Enciso , 257 m, 21°12ʹS 61°39ʹW, Sv. Bílý leg.” ; allotype (female): the same data ; paratypes: the same data ( 11 males, 22 females) ; “ Paraguay, Prov. Boqueron, 5.–7.xii.2010, Loma Plata, 141 m, 22°23ʹS 59°50ʹW, Sv. Bílý leg.” ( 4 females) ; “ Paraguay, Chaco alto, Prov. Boquerón, Enciso NP, 257 m, 21°12ʹ38ʹ S 61°39ʹ26ʹ W, 9.–12.xii.2010, Barries, Bílý & Cate leg.” ( 8 males, 10 females) ; “ Paraguay, Chaco médio, Prov. Boquerón, Loma Plata env., 141 m, 22°23ʹ18ʹ S 59°50ʹ0 6ʹ W, 5.–15.xii.2010, Barries, Bílý & Cate leg.” ( 7 males, 4 females) . Holotype and allotype deposited in NMPC, paratypes in NMPC and WBCW.

Diagnosis. Medium-sized ( 3.6–5.2 mm), subparallel, rather flattened, matt; entire dorsal surface dark bronze with a red lustre, ventral surface bronze in male, dark bronze with blue reflections in female; dorsal surface asetose, frons with extremely short, microscopic, white pubescence; ventral surface with very short, sparse, white pubescence.

Description of the male holotype. Head relatively small, somewhat retracted into pronotum, narrower than anterior pronotal margin; frons widely, deeply grooved, supra-antennal prominences well-developed; vertex slightly convex, about twice as wide as width of eye; eyes small, reniform, not projecting beyond outline of head; sculpture of head consisting of very dense, small, polygonal cells with flat central granules; antennae short, barely reaching midlength of lateral pronotal margins when laid alongside the pronotum; scape claviform, slightly curved, 3 times as long as wide, pedicel oval, 1.5 times as long as wide; third antennomere subcylindrical, 1.6 times as long as wide, antennomeres 4–5 obtusely triangular, 1.4 and 1.2 times as long as wide, antennomeres 6–10 trapezoidal, about as long as wide; terminal antennomere ovoid, slightly longer than wide.

Pronotum moderately convex, 1.70 times as wide as long, with two small, rounded, discal impressions; anterior margin deeply biarcuate, medial lobe rather produced, posterior margin biarcuate; lateral margins distinctly angulate, rectilinearly converging to anterior angles from widest point, with obtuse-angled posterior angles, maximum pronotal width at anterior two fifths; lateroposterior depressions wide but shallow; pronotal sculpture homogenous, consisting of small, dense, polygonal cells with small central granules only along lateral margins; lateral carina short, barely reaching midlength of lateral margins, not visible from above; posterior angles with prehumeral keel (as in the genus Agrilus Curtis, 1825 ) reaching midlength of lateral margins ( Fig. 61 View FIGURES 55 – 63. 55 – 57 ). Scutellum small, triangular, nearly twice as long as wide, microsculptured.

Elytra flattened, 1.16 times as long as wide, narrowed behind the humeri, strongly uneven with several deep depressions: one wide, common, transverse depression at midlength, each elytron with a wide, triangular, preapical depression and with a deep, wide, elongate, lateral depression at posterior two thirds; transverse, humeral depression deep and wide, completely interrupted by a large, blister-like elevation near the humeral callosity; humeral callosities well-developed; elytral epipleura wide, reaching elytral suture, easily visible from above; elytral sculpture dense, rugose with very indistinct punctation on basal half, simply rugose with small, dense granules on posterior half; central portion of elytral disc more lustrous, with weakly developed, fine, oblique punctation; apex of each elytron obtusely truncate, both outer and sutural angles widely rounded.

Ventral surface shiny, finely ocellate; prosternal process flat, wider than long, slightly enlarged behind the procoxae, sharply pointed apically; anal ventrite angulately produced apically, with wide, deep depression along lateral sides. Legs relatively long, slender, protibiae slightly curved, meso- and metatibiae straight, simple; all tarsi much shorter than tibiae; tarsal claws short, slender, hook-shaped, only weakly enlarged at base.

Aedeagus ( Fig. 76 View FIGURES 72 – 81 ) elongate, parameres widened at basal third, with small, sharp, preapical spines; median lobe sharply pointed apically.

Sexual dimorphism. Female differs from male in the somewhat stouter body, dark bronze frons (frons with a red lustre in male) and in the blue lustre of the ventral surface (bronze in male).

Variability. Except for the size (3.6–5.2. mm) no substantial variation was observed.

Measurements. Length: 3.6–5.2 mm ( holotype 4.0 mm); width: 1.6–2.4 mm ( holotype 1.9 mm).

Bionomy. Unknown.

Etymology. Tetragonoschema ( T.) barriesi sp. nov. is named after my friend and colleague Wolfgang Barries (Vienna), a specialist on the genus Chrysobothris Eschscholtz, 1829 .

Distribution. Paraguay (prov. Boquerón).

Differential diagnosis. Tetragonoschema ( T.) barriesi sp. nov. belongs to the group of species with welldeveloped, wide elytral epipleura which are easily visible from above and with parameres with a preapical spine ( T. ( T.) albopilosum and T. ( T.) rubromarginatum ). Except for the characters given in the key it differs from T. ( T.) rubromarginatum in its colouration and different shape of anal ventrite and male genitalia ( Figs. 76 View FIGURES 72 – 81 vs. 75); from T. ( T.) strandi it differs in its less convex body, very short frontal pubescence, different male genitalia ( Figs. 76 View FIGURES 72 – 81 vs. 77) and also in the dark colouration.