Ceriagrion hoogerwerfi, M.A. Lieftinck, 1940

M. A. Lieftinck, 1940, Descriptions and records of South-East Asiatic Odonata (II), Treubia 17 (4), pp. 337-392 : 360-361

Ceriagrion hoogerwerfi , sp. n. ( fig. 14 ).

Material studied: — 1 ♂ (ad.), N. Sumatra, Atjeh government, Meloe- wak , mountain-lake Laoet Tiga Sagi, ca 1500 m alt., April 24, 1937, A. Hoo- gerwerf leg. Holotype in the Buitenzorg Museum .

Male (ad.). — Labium salmon-buff. The whole anterior surface of the head, as far upwards as the frontal ridge and including the basal two joints of antennae, bright orange. Tips of mandibles black. Frontal ridge sharply pronounced, rectangulate. Dorsal surface of frons, vertex and epicranium ochraceousorange, the postocular lobes fading to Buckthorn brown. Lateral extremities of epicranial furrow very finely lined with black. Rear of the head pale greenish-yellow.

Prothorax and dorsum of synthorax, as far down as the humeral suture, light ochraceous-tawny; sutures and ridges of prothorax dark brown; posterior lobe of same simply rounded. Only the lower (mesostigmal) ridges of mesepisternites lined with black posteriorly. No black lines along either side of the mid-dorsal carina, nor on the humeral sutures and alar ridges. Dorsal impressions of the humeral and second lateral sutures with a minute black line. Thoracic sides ochraceous-tawny, slightly intermingled with green. Infraepisterna and lower end of metepimeron yellow ocher. Under surfaces pale greenish-yellow.

Legs ochraceous-buff, apices of tarsal joints and claws black, as are also the spines.

Wings light amber, extreme apices smoky. Pterostigma greyish-brown, much longer than high, oblique and parallel-sided. Ab arises at level of Ac in all wings. Postnodals 1312/11.11.

Abdomen grenadine-red, the sides of first and second segments paler. Segm. 6 with a very fine, sharply defined, black apical ring, restricted to the dorsum. Posterior five-sevenths of the dorsum of 7, and the whole of that of 8 - 10, deep shining black, except for a pair of minute reddish dorsal points, on either side of the middle line, near the apex of 7. Sides of 7 - 8 and 10 pale reddish, those of 9 black. Sternites light red, paling to yellowish posteriorly. Intersegmental membranes between 7 - 1 0 finely yellowish. Posterior margin of segm. 1 0 pinched and strongly excavated, showing a rounded, Λ -shaped ridge which is minutely denticulated.

Anal appendages much shorter than segm. 10, superiors entirely black, inferiors yellow basally. Superior pair globular, rather twisted and with a small, curved interior sub-apical projection. Inferior pair distinctly longer than the superiors, with inflated bases, tapering, distal third more abruptly narrowing and inclined a little inwards and strongly upwards ( fig. 14 ).

Length: abd. + app. 27.5, hw. 20 mm. Female unknown.

M. A. Lieftinck: Descriptions and records of S.E. Asiatic Odonata . 361

This interesting new species differs from its congeners, and especially from other red-bodied species, such as C. erubescens , Selys, by the deep black terminal segments of the abdomen. The anal appendages are rather similar to those of erubescens , but the superiors arc black, and there is only one very small interior tooth. C. hoogerwerfi seems to be most nearly allied to bellona , Laidlaw 1), from Mt. Matang, Sarawak, and Mt. Kinabalu (Borneo). It differs from that species in the longer petiole of the wings, Ab in the wings of bellona originating well before the level of the cubito-anal cross-vein, whereas in hoogerwerfi the two veins are coincident, the position of Ac distal to Ax1 being identical in the two species. C. hoogerwerfi differs further from bellona in the sharply defined, deep black upperside of segments 8 - 1 0 of the abdomen, the distal five-seventh of 7 being also black in colour, whereas in bellona the apical segments are gradually and indefinitely obscured. The anal appendages of the two species are very similar, but the inferior pair of bellona are decidedly longer than those of hoogerwerfi . I have compared the type of this new species with two males and two females of topotypical bellona in my own collection and in that of the Michigan Museum, Ann Arbor, from Mt. Kinabalu. C. hoogerwerfi , I think, is also remotely allied to pendleburyi , Laidlaw 2), from the hill-country of Perak. It is easily distinguished from that species by its orange face, the absence of black lines on the dorsum of the thorax, and by the bright orangered abdomen. It differs further from pendleburyi in the basal portion of the 7th abdominal segment being red instead of black, in the absence of brown basal annules to the base of 7 -10, and in the short and rounded superior anal appendages, which in pendleburyi taper toward the apex, being equal in length to the inferior pair.

Dedicated to Mr. A. H oogerwerf, the intrepid explorer of the high mountains of Atjeh.

Figures

Fig. 14. Ceriagrion hoogerwerfi, sp. n. ♂. Anal appen­ dages, dorsal view and left side.