Amphicnemis wallacei, Selys, 1863

M. A. Lieftinck, 1940, Descriptions and records of South-East Asiatic Odonata (II), Treubia 17 (4), pp. 337-392 : 371-372

publication ID	https://doi.org/ 10.5281/zenodo.3571116
DOI	https://doi.org/10.5281/zenodo.5193630
persistent identifier	https://treatment.plazi.org/id/03B487FF-FFBA-FFD1-FF15-BBB5FC49A867
treatment provided by	Jeremy
scientific name	Amphicnemis wallacei
status

Treatment

Amphicnemis wallacei SELYS ( pl. 15 fig. 4 View Pl , pl. 16 fig. 3 View Pl ).

1863. SELYS, Bull. Acad. Belg. (2) 16, p. 153. — ♂ Sarawak.

1877. SELYS, Ibid. (2) 43, p. 128 - 129. -— Same specimen.

1913. LAIDLAW, P. Z. S. London, p. 71, 74 (key ♂♀), pl. 4 fig. 5 View Fig (♂ proth.), 5 a (♂ apps.).

- ♂♀ Sarawak ( A. louisae View in CoL ).

Material studied: — 1 ♂ (semiad.), labelled: “ Sar. ” (round, white), “ Bor- neo W ” (yellow, SELYS'S hand) , Amphicnemis Wallacii D. S. ♂ Surrawak ” (brown, SELYS'S hand), holotype in the Brussels Museum .- 15 ♂ (mostly ad.), 18 ♀ (3 ad., green, 15 juv., red), W Borneo, Singkawang , Bengkajang Rd. , forest-marsh near Bakoean , near Montrado , and Sempadang , Dec. 19, 1931, July 19 20, Aug. 25 - 30, Sept. 16 - 17, Oct. 11, and Dec. 21, 1932, Jan. 16, 1934 ; 1 ♂ (ad.), W Borneo, Padang Tikar Id. ( Batoe Ampar ), Mar. 12, 1931. All L. Coomans DE RUITER leg., in the Buitenzorg Museum .

A fine series of specimens was obtained by Mr. COOMANS from the marshy forests of West Borneo, and these agree in all essential characters with LAIDLAW'S description and sketches of A. louisae . A recent examination of the type of A. wallacei , in the Brussels Museum, has brought to light that louisae is the same species as wallacei , and that the supposed examples of wallacei recorded by Ris and Laidlaw in reality belong to a species previously unknown to science, for which I proposed the name annae , and of which a description is given above.

Selys's type specimen, collected by WALLACE, though still in excellent condition, is not quite matured; the anal appendages and the prot-horacic spine are exactly identical in structure with those of our series, but the legs are missing.

372 'Pastels Dene 17, 1940, Aim. 4.

There are 12 postnodal cross-veins in both fore wings, 11 in the hinder pair. I can find nothing to distinguish our specimens from the type, except that the nodal index varies from 11-13/10-12. Apart from the well-marked differences in the shape and armature of the anal appendages, wallacei is easily distinguished from annae by the much shorter prothoracic spine, the sharply defined black lines along the posterior surfaces of all femora, and by the complete yellow stripe in front of frons, which is not (or only narrowly) interrupted by black in the median line.

Female. -— Young individuals of this sex are as vividly coloured as those of annae , but the possession of a shorter spine on the prothoracic hind lobe will serve to their easy recognition.

The adult ♀ may be briefly described as follows:-

Head coloured much as in the red form; mandible-bases with a diffuse brownish central spot, basal three-fifths of labrum shining black. Pale fascia in front of frons entire, scarcely constricted on middle. Dorsal surface of head dark metallic bluish-green, or almost lustreless.

Pro- and synthorax dull greyish- to greenish-brown dorsally, growing paler laterally; sides in fully matured examples usually glaucous-green, under surfaces much paler. Ante-alar triangles metallic-green.

Legs, including the coxae, cream-buff; all femora definitely striped with black exteriorly and with the knees also deep black. Spines and extremities of tarsal joints black.

Abdomen with segments 1 and 2 lustrous brown above, each with a terminal metallic-green ring. The rest of the abdomen greyish-brown, pale yellowish below, progressively darker posteriorly, the apical segments (with the exception of 10) being dark brown. Dorsum of 9 with two roundish, pale, sub-apical spots, 10 and appendages entirely greenish-white. Valves also pale-coloured, barely surpassing the anal appendages.