Amphicnemis ecornuta, Selys, 1863

M. A. Lieftinck, 1940, Descriptions and records of South-East Asiatic Odonata (II), Treubia 17 (4), pp. 337-392 : 367-368

Amphicnemis ecornuta Selys ( fig 15 , pl 15 fig 3 ) - 1889. SELYS, Ann. Mus. civ. Genova, 7 (27), p. 482 - 483. -- ♂ C- Sumatra (Fort de Kock).

1898. Kruger, Stett. ent. Zeitg. 59, p.

123 - 125. - ♂♀ N-E. Sumatra

1913. LAIDLAW, P. Z. S. London, p. 74 (key).

1937. LIEFTINCK, Treubia, 16, p. 101 (note).

Material studied: -— 1 ♂ (semiad), holotype, labelled: Fort de Kock. Sumatra, Wyers ” (yellow, Selys's hand) under drawer-label: " Amphicnenıis ecornuta Selys n sp _” (id) ; 1 ♀ (ad); “ Dohrn, Sumatra, Soekaranda " (printed), “ Amphicnemis ecornuta Selys ♀ Sumatra Kruger " (Selys's hand). Both specimens in the Brussels Museum. 1 ♂, 1 ♀ (ad), “ Dohrn, Sumatra, Soekaranda ” (♀ allotype), in the Stettin Museum. —- 1 ♂ (ad.), S. Sumatra, Lampong residency, Tandjong Karang, Kedaton Estate, Wai Rilau , 150 m alt., March 26, 1937, J. VAN DER Vecht leg., in the Buitenzorg Museum.

368 TREUBIA DEEL 17, 1940, AFL. 4

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For a detailed description of this magnificent species the reader is referred to Kruger's account.

The ♂ from South Sumatra resembles closely the two other examples, from Fort de Kock and Deli (including the type), with which I have compared it. The type, though fully matured, has obviously been preserved in alcohol and this may largely account for its exceptionally small size; the anal appendages are shrivelled and the colour of the legs has faded to an uniform pale yellow. The only difference which I can make out is that the dorsal anastomosis of the metallic-green juxta-humeral (mesepimeral) fascia (fig. 15) is obliterated in the type. This slight difference I regard as of no importance. The anal appendages of the ♂ differ but slightly from those of amabilis , sp. n. (cf. pl. 15 fig. 2 & 3 ).

Measurements of Lampong ♂: abd. + app. 45, hw. 26.5 mm.

Figures

Fig.15. Colour-pattern of synthoraxof Am- phicnemis ecornutaSelys, ♂ (Lampongres., left), andofA.amabilis, sp.n. ♂ (E.Borneo, right).

Pl . 15 . — Structural characters of Malaysian species of Amphicnemis . 1 - 3 . Male anal appendages , dorsal view and right side . 4 . Right lateral view of prothorax .

Fig. 2. Ventral aspect of seminal vesicle (top) and left side-view of anal appendages of Euphaea subnodalis Laid., from Mt. Marapok (bottom).

Fig. 3. Lestes praevius, sp. n. Male anal ap­ pendages, dorsal view (left side), and right side-view.