Drepanosticta tenella, Lieftinck, 1935

Lieftinck, M. A., 1935, A Synopsis of the Odonata (Dragonflies) of Sumatra, Miscellanea Zoologica Sumatrana 1, pp. 1-23 : 7

**34. Drepanosticta tenella , sp. n. ( fig. 1 ).

- 14 ♂, 6 ♀, S. Lampoeng Res.: Mt. Tanggamoes , 4-600 m. Gisting and environs, Dec. 25-30, 1934, Author leg .

♂.- Colour-pattern of the body very similar to gazella Lieft, from Java, though better pronounced. Pale colours in front of head pale blue, or creamy-yellow inter­ mingled with green; labrum bordered with black. Prothorax with anterior and posterior lobes bronzy-black, the latter saddle-shaped, margin very slightly concave: side- edges well pronoun­ ced but very little projecting, bluntly pointed, without horn-like processes. Thoracic sides much as in gazella. but the lower (anterior) two-thirds of metepimerum sharply defined bronzy-black; remainder and under surfaces pale yellowish. Wings as in gazella. pterostigma only a trace. shorter, pale reddish brown. Neuration also similar; Y -vein present. whether or not stalked. Postnodals 13-15 in front, 12-14 in hind wing. Abd.-segm. 1-7 similarly marked; 8 with a dull blue marking, variable in shape, covering the basal 1 /3 to 2/ 3 of the dorsum; remainder black. Sup. anal apps. of simpfe structure, evenly curved inwards. not so bent at base. their distal third strongly enlarged and broadly rounded at tip, without any ventral tooth-like projections; inferiors as long as upper pair. shaped much as in gazella ( fig. 1 ).

♀. - Differs from the ♂ only in that the side-edges of the posterior prothoracic lobe are still smaller: rectangular. or bluntly triangular in outline. Postnodals 14 in front, 13 in hind wing. Valves shaped as in gazella. projecting beyond the end segm 10 for ca. 1 mm. Length: ♂ abd. + app. 28-31, hw. 18-20; ♀ 25-26, 19- 20 mm. Types in Mus. Buitenzorg. - Although closely allied to gazella. this tiny species is easily distinguished from it by the absence of prothoracic horns and by the simple structure of the anal apps. of the ♂. Differs from D. bispina Pras. (♀ only) by the absence of curled horns at the prothorax and by the very broad and distinct black band running over most of the metepimerum.

Figures

Fig. 1.- Drepanosticta tenella sp. n. ♂ Lampoeng, Anal apps., dorsal view and right side