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Show 1902.] DRAGONFLIES OF T H E " S K E A T EXPEDITION." 81 are scarcely visible. Segments 3-7 have an incomplete basal orange ring occupying in segment 3 about one-fourth of the f2£^K' mr ? 110t m o r e t h a n one-yixth, and in 7 not more than two-ntths of the segment. Remaining three segments black, decreasing successively m size ; anal appendages pointed, larger than the tenth segment, yellow. Differs from the typical race in the smaller extent of the yellow marks on the abdomen. The yellow lozenge-shaped dorsal spot on segment 3 is present, that on 4 is scarcely visible. The great length of the first two cells between the sectors of the arculus is remarkable. The cross nervule enclosing the third cell is beyond the level of origin of the principal sector. Legion LINDENIA. G O M P H I D I A PERAKENSIS, sp. n. (Plats VI. figs. 1, 2.) Total length 78 m m. Length of abdomen (without appendages) 54 f| Breadth of head 12-5 Length of hind wing 54 „ „ flo^rCe wwiinngg 5_4 ;j „ pterostigma 8 „ Breadth of hind wing 14 Length of upper anal appendage... 4 „ Colour black with saffron-yellow markings; wings hyaline, reticulation black. Fore wing. 22-23 antenodals, 17-18 postnoda's. Internal triangle divided into three cells; discoidal triangle into four. Membranule small, dark brown. Pterostigma long, black. Hind wing. 15-16 antenodals, 20-21 postnodals. Internal triangle divided into three cells ; discoidal triangle into four. Head. Labium, mandibles, and labrum black; gena black, with a dull yellow spot. Rhinarium saffron-yellow ; nasus black, with a saffron-yellow spot on either side. Anterior surface of frons black, horizontal surface yellow. Vertex and occiput black. The vertex has two conical projections, one on either side as in G. T-nigrum, but not so large relatively. Prothorax black. Thorax black, with the following saffron-yellow marks:-In front dorsally a semicircle broken by the mid-dorsal carina. From the outer ends of the semicircle, but separated widely from them, a short broad band runs on either side to the ante-alar sinus, inclining towards the middle lines. Behind these on either side is a small spot, just below the sinus and immediately in front of the first pair of wings. Laterally are two large bands widely separated. The first pair run obliquely forward from below the first pair of wings; the second pair are rather smaller, and rim obliquely forward from below the second pair of wings : neither pair reaches the ventral surface. Dorsally between the wings there are brown marks and a PROC. ZOOL. Soc- 1902, VOL. I. No. VI. 6 |