Oxyserica Brenske, 1900

Oxyserica Brenske, 1900a: 54 (type species by monotypy: Oxyserica pygidialis Brenske, 1900); Ahrens 2004b: 189; Fabrizi & Ahrens 2016: 134.

Parvulomaladera Ahrens, 1995 b: 45 (type species by original designation: Microserica simlana Brenske, 1902); synonymized by Ahrens 2004b: 189.

Key to the species of the Oxyserica pygidialis species group (♁♁)

1 Antennal club of males composed of four antennomeres...................................................... 2 - Antennal club of males composed of five antennomeres....................................................... 3 - Antennal club of males composed of six antennomeres....... O. goertzae Sreedevi, Ranasinghe, Fabrizi & Ahrens, 2019 2 Pygidium in female with a sharp pyramid-like tubercle at apex. Antennomere six in male transversely produced, sometimes subequal in length with antennomere seven................................... O. pygidialis pygidialis Brenske, 1900 - Pygidium in female without sharp pyramid-like tubercle. Antennomere six in male cylindrical as antennomere five.........

................................................................................... O. varia (Frey, 1975)

3 Antennal club in male twice as long as remaining antennomeres combined, distinctly wider than width of base of clypeus and in apical third slightly reflexed externally................................................................... 4

- Antennal club in male straight, only little longer than remaining antennomeres combined............................ 7

4 Body wide and stout. Pronotum only little narrower than elytra (ratio width: 1/1.28) and distinctly wider than head (including eyes) (ratio width: 1.7/1). Dark median transverse band on elytra extended from dark lateral margin to dark sutural interval............................................................................. O. kurseongana (Moser, 1915)

- Body narrower. Pronotum distinctly narrower than elytra (ratio width: 1/1.4) and only little wider than head (including eyes) (ratio width: 1.5/1).................................................................................... 5

5 Antennal club entirely black............................................................................. 6

- Antennal club basally yellowish.................................................... O. bimaculata (Hope, 1831)

6 Parameres short, in lateral view distinctly shorter than maximum width of phallobase......... O. longefoliata (Frey, 1965)

- Parameres moderately long, in lateral view as long as maximum width of phallobase..... O. kanchenjungae (Ahrens, 1995)

7 Pilosity of frons and anterior margin of pronotum very long, subequal 1/3 of pronotal length. Antennal club in male as long as width of basal clypeus................................................ O. pygidialis annapurnae (Ahrens, 1995)

- Pilosity of frons and anterior margin of pronotum shorter. Antennal club in male shorter than width of basal clypeus....... 8

8 Pygidium in female evenly convex, densely punctate. Punctation of female coarse and sparse......................... 9

- Pygidium in female unevenly convex, with a median transversal convexity....................................... 10

9 Pygidium in female widely dull, finely and densely punctate. Ventral lobes abruptly narrowed and emarginate before apex (dorsal view).................................................................. O. brancuccii (Ahrens, 2001)

- Pygidium in female only narrowly dull at base, sparsely punctate. Ventral lobes not abruptly narrowed and emarginate..................................................................................... O. hellmichi (Frey, 1965)

10 Antennal club as long as remaining antennomeres combined. Pygidium in female with a sharp pyramidlike tubercle at apex....................................................................... O. pygidialis pygidialis Brenske, 1900

- Antennal club distinctly longer than remaining antennomeres combined. Pygidium in female without a sharp pyramid-like tubercle at apex.............................................................. O. darjeelingia (Brenske, 1898)