Maladera egregia (Arrow, 1946)

Fabrizi, Silvia, Liu, Wan-Gang, Bai, Ming, Yang, Xing-Ke & Ahrens, Dirk, 2021, A monograph of the genus Maladera Mulsant & Rey, 1871 of China (Coleoptera: Scarabaeidae: Melolonthinae: Sericini), Zootaxa 4922 (1), pp. 1-400 : 105-107

Maladera egregia (Arrow, 1946)

Figures 22 A–D, 97

Aserica egregia Arrow, 1946b: 14 .

Maladera egregia: Ahrens 2004a: 324 .

Type material examined. Syntypes: 3 ♂♂ “N. E. Burma Kambaiti 2000 m 28.5.1934 Malaise / N. E. Burma R. Malaise B. M. 1945-71/ Cotype/ Aserica egregia Arrow co-type” ( BMNH), 1 ♂ “N. E. Burma Kambaiti 2000 m 20/6.1934 R. Malaise / N. E. Burma R. Malaise B. M. 1945-71/ Cotype” ( BMNH), 1 ♂ “N. E. Burma Kambaiti 2000 m 4/6.1934 Malaise / N. E. Burma R. Malaise B. M. 1945-71/ Cotype / Aserica egregia Arrow co-type” ( BMNH) .

Redescription. Length: 8.6 mm, length of elytra: 6.4 mm, width: 5.6 mm. Body oblong-oval, reddish brown, antenna yellow, iridescent and shiny, frons and pronotum somewhat dull, dorsal face nearly glabrous.

Labroclypeus wide and subtrapezoidal, widest at base, lateral margins weakly convex and convergent anteriorly, anterior angles moderately rounded, anterior margin distinctly emarginate, margins weakly reflexed; lateral margin and ocular canthus produce an indistinct angle; surface weakly convex, finely, densely punctate, with a few long setae anteriorly; frontoclypeal suture finely incised, weakly curved; smooth area anterior to eye convex, 1.5 times as wide as long; ocular canthus short and wide (1/4 of ocular diameter), finely densely punctate, without terminal setae. Frons with sparse and fine punctures, with a few fine setae beside eyes. Eyes small, ratio diameter/ interocular width: 0.52. Antenna with ten antennomeres; club with three antennomeres and straight, as long as remaining antennomeres combined. Mentum elevated and slightly flattened anteriorly.

Pronotum transverse, widest at base, lateral margins evenly convex and weakly convergent anteriorly, anterior angles distinctly produced and sharp, posterior angles blunt; anterior margin convex, with fine marginal line, base without marginal line; surface finely and densely punctate, with minute setae in punctures being as long as puncture diameter, otherwise glabrous; lateral margin sparsely setose; hypomeron carinate, not produced ventrally. Scutellum wide, triangular, with fine, dense punctures, impunctate medially.

Elytra widest in posterior third, striae finely impressed, finely and densely punctate, intervals weakly convex, with fine, moderately dense punctures concentrated along striae, with minute setae in punctures, penultimate lateral interval with a few fine setae; epipleural margin robust, ending at apical external angle of elytra, epipleura densely setose; apical border of elytra membraneous, with a very fine rim of microtrichomes (visible at ca 100x magnification).

Ventral surface dull, coarsely and densely punctate, metasternum including disc densely setose; metacoxa glabrous, with a few longer setae laterally. Mesosternum between mesocoxae as wide as mesofemur. Ratio of length of metepisternum/metacoxa: 1/1.49. Abdomen in available syntype specimen missing.

Legs moderately long and narrow, shiny; femora with two longitudinal rows of setae, coarsely and moderately densely punctate. Metafemur dull, anterior margin acute, with adjacent continuous serrated line, anterior row of setae complete; posterior ventral margin smooth, weakly widened at ventral apex, dorsal posterior margin smooth, neither serrate, glabrous. Tarsomeres dorsally impunctate, glabrous, neither laterally nor dorsally carinate, moderately setose ventrally. Protibia moderately long, bidentate; anterior claws symmetrical, basal tooth of both claws bluntly truncate at apex.

Aedeagus: Fig. 22 A–C. Habitus: Fig. 22D .

Remarks. The metatibiae were lacking in the syntype specimen we examined and are thus omitted in the redescription.

Distribution. See map ( Fig. 97 ) and Table 1.

Figures

FIGURE 22. A–D: Maladera egregia (Arrow, 1946) (syntype: Myanmar: Kambaiti); E–I: M. levis (Frey, 1972) (holotype); J–M: M. hmong Ahrens, 2004 (Paratype: Vietnam: Sa Pa). A, E, J: aedeagus, left side lateral view; C, H, L: aedeagus, right side lateral view; B, F, K: parameres, dorsal view; G: parameres, ventral view; D, I, M: habitus. Scale: 0.5 mm. Habitus not to scale.

FIGURE 97. Distribution of the Maladera egregia group: Maladera diaolinensis sp. n., M. egregia (Arrow, 1946), M. gusakovi sp. n., M. hmong Ahrens, 2004, M. hubeiensis sp. n., M. laocaiensis sp. n., M. levis (Frey, 1972).