Maladera ferruginea (Kollar & Redtenbacher, 1848) group

Key to species of the Maladera ferruginea (Kollar & Redtenbacher, 1848) group occurring in China (³³):

1 Parameres asymmetrical................................................................................ 2

1’ Parameres symmetrical................................................................................. 5

2 Parameres with long basal lobes.......................................................................... 3

2’ Parameres with very short basal lobes or completely without lobe............................................... 7

3 Basal lobes of parameres narrow, nearly filiform. Dorsomedian apical emargination of phallobase narrow and deep........ 4

3’ Basal lobes of parameres wide and lobiform. Dorsomedian apical emargination of phallobase wide and moderately deep..................................... Maladera wulaoshanica Ahrens, Fabrizi & Liu, sp. n.

4 Parameres evenly narrow, distinctly bent in anterior third (lateral view)......... Maladera pui Ahrens, Fabrizi & Liu, sp. n.

4’ Parameres bluntly widened in anterior third on dorsomedian margin, nearly straight (lateral view)............................................................................... Maladera tengchongensis Ahrens, Fabrizi & Liu, sp. n.

5 Metatibia short and wide. Parameres moderately long, including basal lobes much shorter than phallobase............... 6

5’ Metatibia moderately long and narrower. Parameres long, including basal lobes nearly as long as phallobase...................................................................... Maladera taiyangheensis Ahrens, Fabrizi & Liu, sp. n.

6 Parameres straight. Basal lobes sharply pointed.................... Maladera bubengensis Ahrens, Fabrizi & Liu, sp. n.

6’ Parameres reflexed. Basal lobes convex........................... Maladera rubriventris Ahrens, Fabrizi & Liu, sp. n.

7 Body size <9 mm. Anterior frons without dull toment but shiny....... Maladera beibengensis Ahrens, Fabrizi & Liu, sp. n.

7‘ Body size> 11 mm. Frons completely with dull toment........................................................ 8

8 Parameres subequal in length. Antennal club as long as the remaining antennomeres combined................................................................................. Maladera tongzhongensis Ahrens, Fabrizi & Liu, sp. n.

8’ Parameres unequal in length, left paramere distinctly shorter than right. Antennal club distinctly longer than the remaining antennomeres combined................................................................................ 9

9 Left paramere distinctly widened at distal third. Right paramere with a sharp lateral preapical tooth.....................`....................................................... Maladera bawanglingensis Ahrens, Fabrizi & Liu, sp. n.

9’ Left paramere quite evenly narrow over its entire length. Right paramere with a blunt dorsal preapical tooth............................................................................... Maladera jiangi Ahrens, Fabrizi & Liu, sp. n.