Enithares mandalayensis Distant, 1910

Nieser, Nico, 2004, Guide To Aquatic Heteroptera Of Singapore And Peninsular Malaysia Iii. Pleidae And Notonectidae, Raffles Bulletin of Zoology 52 (1), pp. 79-96 : 93-94

Enithares mandalayensis Distant, 1910

Enithares mandalayensis Distant, 1910 ; Lansbury, 1968 (redescription); Fernando & Cheng, 1974; Fernando & Leong, 1976.

Diagnosis. – Length, male 6.6-6.9, female 7.0-8.0; width, male and female 2.2-2.8. Generally pale, eyes reddish, vertex, pronotum and scutellum pale yellowish in some specimens with a dark transverse band anteriorly on pronotum. Hemielytra and hind wings translucent, dorsum of abdomen brown to grey, legs yellowish with blackish spines and bristles and sparse dark markings.

Head in dorsal view rounded anteriorly, vertex slightly protruding; width of head about 2.5-2.8 times anterior width of vertex. Anterior width of vertex 2.3-2.5 times the synthlipsis. Dorsal margin of pronotal fovea directed straight caudad before turning laterad. Mesotrochanter rounded. Metasternal xiphus as in Fig. 35 mn.

Male. Fore leg, tibia distally and first tarsal segment with shallow indentations. Outer claw of middle tarsus curved and widened ( Fig. 37 ).

Remarks. – Males can be distinguished by the outer claw of middle tarsus in combination with their size. Females are distinguished by the shape of the metasternal xiphus and their smaller size. Lansbury (1968) states that the width of head in 60% of his specimens examined is less than two times the anterior width of vertex. The range of this ratio cited in the diagnosis above is based on Malayan specimens.

Distribution. – Burma, Thailand, Vietnam, West Malaysia. In Malaysia it has been recorded from Johor, Melaka, Negeri Sembilan (Fernando & Cheng, 1974; Lansbury, 1968). In ZRC there are also some specimens from Singapore (Nee Soon swamp forest), new record for Singapore and samples from Kelantan, Selangor and Terengganu.

Figures

Fig. 35. Enithares species, metasternal xiphus. c = E. ciliata, mn = E. mandalayensis, ml = E. malayensis, me = E. metallica.

Fig. 37. Enithares mandalayensis male, tarsus of middle leg. Thickened and bent inner claw dotted.