Microserica lineata, Moser, 1915

Bohacz, Claudia & Ahrens, Dirk, 2020, New species of the Microserica lineata group from Laos and Thailand (Coleoptera Scarabaeidae: Melolonthinae: Sericini), Zootaxa 4859 (2), pp. 263-274 : 273

Key to the species of the Microserica lineata group

1 Phallobase short, about twice as long as wide in right side lateral view ( Figs. 1F, I ). Pronotum yellowish with one or two dark spots................................................................................................ 2

- Phallobase long, more than three times longer than wide in right side lateral view ( Figs. 1C, M ). Pronotum uniformly brown ................................................................................................... 3

2 Pronotum yellowish with one median dark spot. Right paramere long, its apex strongly widened apically ( Fig. 1B ). Antennal club little longer than the remaining antennomeres combined................................ M. lineata Moser, 1915

- Pronotum yellowish with two symmetric dark spots beside the dark midline. Right paramere short, its apex weakly widened apically ( Fig. 1K ). Antennal club twice as long as the remaining antennomeres combined..... M. geberbauer Ahrens, 2004

3 Left lateral process of phallobase strongly widened apically but straight ( Fig. 1D )................................... 5

- Left lateral process of phallobase narrow and not widened apically...............................................4

4 Left lateral process of phallobase strongly hooked ventrally at apex ( Fig. 1G ). Body densely covered with small white setae. Body smaller, 6.8–7.1 mm. Anterior margin of metafemur with serrated line.............. M. crenatostriata Ahrens, 2004

- Left lateral process of phallobase evenly narrowed towards apex ( Fig. 3I ). Serrated line beside anterior margin of metafemur and beside dorsal margin of metatibia lacking...................... M. tenasserimensis Bohacz & Ahrens , new species

5 Ventral lamina of left side of phallobase strongly produced ventrally, phallobase results distally strongly widened ( Fig. 2A ).................................................................. M. ventrosa Bohacz & Ahrens , new species

- Ventral lamina of left side of phallobase not produced ( Fig. 1D ), phallobase distally not widened....................... 6

6 Body densely covered with small white scales. Right paramere short and wide............… M. squamulata (Moser, 1915)

- Body sparsely covered with small white scales, only with dense, white minute setae................................. 7

7 Right paramere robust and elongate, width subequal to maximum phallobase width................................. 8

- Right paramere narrow and curved, width much narrower than maximum phallobase width.............................................................................................. M. helferi Bohacz & Ahrens , new species

8 Base of labroclypeus dull. Dorsal margin of right paramere evenly curved (lateral view)................................................................................................ M. ginae Bohacz & Ahrens , new species

- Base of labroclypeus shiny. Dorsal margin of right paramere strongly bent at middle and concave basally (lateral view).................................................................. .. M. banvaneue Bohacz & Ahrens , new species

Figures

FIGURES 1A–M. A–C, Microserica lineata Moser, 1915 (syntype: Myanmar: Pegu); D–F, Microserica squamulata (Moser, 1915) (lectotype: “Siam Hinlap”); G–I, Microserica crenatostriata Ahrens, 2004 (holotype); J–M Microserica geberbauer Ahrens, 2004 (holotype). A, D, G, J, aedeagus, left side lateral view; C, F, I, M, aedeagus, right side lateral view; B, E, H, K, parameres, dorsal view. Scale: 0.5 mm. Abbreviations: llpphb—left lateral process of phallobase; ms—dorsomedian emargination (sinuation) of phallobase; phb—phallobase; rpm—right paramere.

FIGURES 2A–F. A–D, Microserica ventrosa Bohacz & Ahrens, new species (holotype); E–H, M. ginae Bohacz & Ahrens, new species (holotype). A, E, aedeagus, left side lateral view; C, G, aedeagus, right side lateral view; B, F, parameres, dorsal view; D, H, habitus (not to scale). Scale: 0.5 mm.

FIGURES 3A–L. A–D, Microserica banvaneue Bohacz & Ahrens, new species (holotype); E–H, M. helferi Bohacz & Ahrens, new species (holotype); I–L, M. tenasserimensis Bohacz & Ahrens, new species (holotype). A, E, I, aedeagus, left side lateral view; C, G, K, aedeagus, right side lateral view; B, F, J, parameres, dorsal view; D, H, L, habitus (not to scale). Scale: 0.5 mm.