Amphicnemis mariae, M.A. Lieftinck, 1940

M. A. Lieftinck, 1940, Descriptions and records of South-East Asiatic Odonata (II), Treubia 17 (4), pp. 337-392 : 374-376

Amphicnemis mariae , sp. n. ( pl. 15 fig. 1 ).

Material studied: — 3 ♂ (one ad.), E. Borneo, N. Koetai, Sangkoelirang distr., Pelawan Besar & Kariorang , May -June, 1937, M. E. WALSH leg., in the Buitenzorg Museum. Holotype ♂: Pelawan Besar , May 1937 .

Male (ad.), - Head coloured as described for annae , but labrum with anterior, ochreous, margin broader and with the yellow fascia in front of frons barely interrupted in the middle line.

Colouring of pro- and synthorax as described in the key. In all three specimens there is a fine comma-shaped yellow spot lying close against the upper margin of the mesepimeron, on each side of the dorsal end of the humeral suture.

M. A. Lieftinck: Descriptions and records 0 ƒ S. E. Asiatic Odonata , 375 ÎÎ

The squarish lustrous spot covering the upper part of the mesepisternum is separated from the dark colour on the mesepimeron by a fine yellow ling Sides and under surfaces pale yellow.

Legs pale yellow, apices of all femora and tibiae, spines and tips of tarsal joints, black.

Neuration identical to the other species of the same group. Postnodals13-14/11-12,

Pterostigma greyish-brown, with pale yellow margin. Abdomen coloured as in wallacei ; distal margin of segment 10 whitish. Anal appendages yellowish-white, shaped as shown on pl. 15 fig. 1 .

Female unknown.

this new Species is easily distinguished from its allies by the reduction of the metallic-green colour on the dorsum of the pro- and synthorax, and by the anal appendages, which appear to resemble those of remiger fairly closely. Named in honour of Mrs. M. E. Walsh, in appreciation of her constant help in collecting Odonata . Amphicnemis martini Ris.

1911. Ris, Ann. Soc. ent. Belg. 55, p. 236 (key ♂), 237 238, fig. 6 (apps. ♂). — ♂ W. Borneo

1913. LAIDLAW, P. Z. S. London, p. 72 73; 74 (key). - ♂♀ Sarawak.

Material studied: - 5 ♂ (semiad.-ad.), 6 ♀ (2 juv., red, 4 ad., blue), W. Borneo, Singkawang, forest-marsh near Bakoean , Dec. 7, 1931, Febr. 17 - 19, July 19, 1932, L. Coomans DE RUITER leg., in the Buitenzorg Museum .

Male. — These specimens agree exactly with Ris’s account of A. martini , save that in the fully adult examples the colour of the pterostigmata of the fore wings is deep greenish-black centred with dark brown and with the border yellow, whilst those of the hinder wings are throughout bright orange. There are 14-15/13 postnodal cross-nerves. In the semi-adult males the thoracic sides and legs are yellow.

The colour of the tenth abdominal segment varies from yellow to pale blue. Anal appendages wax-yellow to pale brown. Superior pair decidedly shorter than in wallacei and allied species, each with a distinct triangular protuberance at about the middle of their length, directed obliquely inwards and upwards, followed by a similar (slightly more robust) triangular expansion, which projects horizontally inwards; the median incision between these two projections (Ris, loc. cit. fig. 6 ) is visible only in oblique dorsal view. Inferior pair of appendages only half a long as the superiors, cylindrical, tapering, slightly divergent, tips evenly and but slightly upcurved.

376 TREUBIA Deel 17, 1940, AFL. 4.

Female (ad.). - Legs pale yellow, femora striped with black exteriorly and with the extremities also finely black. Anterior pair of tibiae with the basal one-third of the outer surfaces black.

Valves not projecting beyond the apex of abdomen.

Female (juv.). - The red colour-phase of this species is peculiar for the brilliant metallic-green episterna of the mesothorax, which, in the red-bodied females of other species, are of the same colour as the rest of the thorax. There is also a median bronze-green spot on the middle of the prothorax that covers the whole of the posterior lobe as well.

The coxae, tibiae and tarsi are yellowish whilst the femora are red, lacking black exterior stripes.

Figures

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. 6. Drepanosticta barbatula, sp. n. ♂. Anal appendages, dorsal view and right side.