Bilyaxia (Paraguayetta), 2013

Bily, Svatopluk, 2013, A study on the Neotropical Anthaxiini (Coleoptera, Buprestidae, Buprestinae), ZooKeys 304, pp. 17-47 : 38-39

Bilyaxia (Paraguayetta) subgen. n. Fig. 12

Type species:

Anthaxia (Cylindrophora) mariae Cobos, 1956 by present designation.

Diagnosis.

Rather large (7.0 mm), robust, moderately convex, multicolorous: dorsal surface and legs blue-green with green tinge, pronotum with two, weakly defined black spots, humeri and posterior half of elytra bronze with red lustre, ventral surface blue-green; antennae black with strong green lustre.

Head large, as wide as anterior pronotal margin; clypeus trapezoidal, separated from frons by deep, transverse depression, anterior margin rounded; frons deeply, widely grooved, vertex almost flat, about twice as wide as width of eye; antennae slightly extending beyond midlength of lateral pronotal margins when laid alongside, antennomeres 5-10 widely trapezoidal; sculpture of head consisting of small, oval cells with large, flat central grains which are dense along eyes and very sparse in middle.

Pronotum convex, 2.2 times as wide as long, posterior margin deeply biarcuate; lateral margins slightly S-shaped, posterior angles sharp; “agriloid” carina well defined, reaching posterior third of lateral margins; lateroposterior depressions and basal tubercles weakly defined, prescutellar pit large, deep; sculpture consisting of basal microsculpture and dense, weakly defined polygonal cells without central grains. Scutellum cordiform, somewhat longer than wide, convex.

Elytra regularly convex, twice as long as wide, with obtusely rounded apices, not caudiform; humeral swellings small, basal, transverse depression deep, wide, reaching scutellum; elytral epipleura well defined, subparallel, reaching elytral apex; subhumeral carina strongly defined, nearly reaching elytral apex; sculpture consisting of short, transverse, zig-zag rugae.

Ventral surface roughly ocellate, prosternum slightly convex with shallow transverse groove just behind anterior margin which is in this way transformed into fine, transverse, perpendicular ledge (as in Fig. 34e ); both anal ventrite and tergite simply rounded, not serrate. Legs moderately long, all tarsi shorter than tibiae; tarsal claws strong, simply hook-shaped.

Male unknown.

Etymology.

The subgenus Paraguayetta subgen. n. (feminine) is named after the country of the origin (Paraguay).

Differential diagnosis.

The subgenus Paraguayetta subgen. n. differs from other subgenera of Bilyaxia by the large, robust body, anteriorly rounded clypeus, S-shaped lateral, pronotal margins, weakly defined lateroposterior pronotal depressions, large and deep prescutellar pit, ledge-shaped anterior prosternal margin (as in Fig. 34e ) and by the simple, not serrate anal ventrite.

Species included.

Bilyaxia (Paraguayetta) mariae (Cobos, 1956).

Note.

Except for the holotype (female, MNCN), only one further specimen was found in the collections: the female holotype of Brasilaxia jacobi Obenberger, 1958 which was synonymized with Anthaxia (Cylindrophora) mariae by Cobos (1972). This specimen (female, NMPC) is labelled: "Paraguay, Alto Paraná, Hohenau, H. Jacob[p], Nov. 1931[h]".

Figures

Figures 7 - 12. 7 Agrilaxia (Costiptera) occidentalis (Kerremans, 1900), male, 5.3 mm (Brasil, Caraca) 8 Agrilaxia (Costiptera) costulipennis (Cobos, 1972), male, 5.8 mm (Argentina, Entre Rios) 9 Agrilaxia (Costiptera) modesta (Kerremans, 1897), male, 5.3 mm (Brasil, Jatahy) 10 Bilyaxia (Bilyaxia) cupriceps (Fairmaire & Germain, 1858), male, 4.7 mm (Chile, La Union) 11 Bilyaxia (Bilyaxia) obscurata (Reed, 1873), male, 5.3 mm (Chile, Talca) 12 Bilyaxia (Paraguayetta) mariae (Cobos, 1956), female, 7.0 mm (holotype of Anthaxia jacobi Obenberger, 1958).

Figures 31 - 34. 31 Charlesina mrazi (Obenberger, 1932), scutellum 32 the same, Anthaxita peruviana, sp. n. 33 Agrilaxia (Agrilaxia) claudei (Cobos, 1972), right protibia 34 Agrilaxia spp., anterior margin of prosternum (lateral view): (a) flat to weakly convex, (b) weakly grooved, (c) deeply grooved, (d) with sternal, longitudinal carina, (e) rolled up anterior margin, (f) peg-like spine.