Parastasia anomala Arrow, 1899

Hongsuwong, T., Jaitrong, W., Tasen, W. & Zorn, C., 2020, New records of the chining leaf chafer beetles (Coleoptera: Scarabaeidae, Rutelinae) from Thailand and Laos, Far Eastern Entomologist 398, pp. 8-17 : 10-12

Parastasia anomala Arrow, 1899

Figs 7–12

Parastasia anomala Arrow, 1899: 495 . Type Locality: Penang, Malaysia (BMNH).

Parastasia anomala: Ohaus, 1900: 252 ; Ohaus, 1932b: 130, Ohaus, 1934: 103; Kuijten,

1992: 25.

MATERIAL EXAMINED. Thailand: Nakhon Si Thammarat province , Khao Nan

National Park, headquarters, light trap, 28.III 2007, 1 male ( THNHM –I–09977), T. Jeen-

thong leg.

DIAGNOSIS. Adult male. Parastasia anomala is member of the westwoodi -group (Wada,

2015), which is characterized by the combination of the following characters: setigerous pun-

male: 7 – habitus, dorsal view; 8 – habitus, lateral view; 9 – habitus, ventral view.

genital paramere, dorsal view; 11 – genital paramere, ventral view; 12 – genital paramere,

right lateral view.

ctures on propygidium, setose pygidium in males; mesotarsomere 5 in males equal in length or longer than mesotarsomeres 1 to 4, outer claw of mesotarsus in female widely and deeply split. Within the westwoodi -group, P. anomala is separated from the other species by the combination of the following characters: incomplete basal bead of pronotum, truncate clypeus, clypeal apex with two denticles, lower apex of mandibular plate without denticles,

lateral region of pronotum with fovea, apex of labrum narrowly truncate for less than 1/3 the width, metasternum produced to the apex of mesocoxa. Moreover, the inner protarsal claw in males is distinctly larger than the outer claw and slightly incised at the dorsal margin. Parastasia anomala is superfially also similar to Parastasia selangorica Kuijten, 1992 in having a small body size and reddish coloration. However, P. selangorica belongs to the discolor -

group (Wada, 2015), which differs from the westwoodi -group by the simple protarsal claws in both sexes, the propygidium lacking setae and a glabrous pygidium in males. Male genitalia. Symmetric aedeagus; paramere not overlapping each other, lateral margins sinuate before apexes, ventral margin of paramere with a membraneous extension towards middle

( Figs 10–11 ). In lateral view, paramere subtriangular, its dorsal outline almost straight, while ventral outline sinuate and hook-shaped apically ( Fig. 12 ).

DISTRIBUTION. Thailand (new record), Borneo (Arrow, 1899; Ohaus, 1900; Wada,

2015), West Malaysia (Arrow, 1899; Ohaus, 1932b; Wada, 2015), Sumatra (Wada, 2015).

REMARKS. Parastasia anomala has a sundaic distribution. The record in the present study is the northernmost in its distribution range. The single specimen was collected from a wet seasonal tropical rainforest using a light trap.

Tribe Anomalini Streubel, 1839

Figures

Figs 7–9. Figs 7–9. Parastasia anomala, Thailand: Nakhon Si Thammarat province,

Figs 10–12. Parastasia anomala, Thailand: Nakhon Si Thammarat province, male: 10 –