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Show 1902.] DRAGONFLIES OF THE " SKEAT EXPEDITION." 73 is free, in three females crossed; in males it is normally free.) Two rows of post-triangular cells. Nodal sector strongly waved at its middle. Arculus at the level of the second antenoclal. Two cross nervules in the submedian space. Hind rvings. 10-11 antenodals, 9-9 postnodals. Discoidal triangle traversed. (According to de Selys the discoidal triangle of the hind wing in the female is normally traversed ; of 13 males 7 had it traversed and 6 free.) The triangle is followed by two rows of cells. The British Museum specimen (male) has but one row of post-trigonal cells in the hind wings. Pterostigma in the females is about 3-75 m m . long, in the male about 2-25 mm. Sectors of triangles of hind wings widely separated at their origins. Rhinarium and nasus livid yellow. Frons and vertex metallic blue-green. Thorax metallic blue-green. Abdomen slightly thickened at its base, metallic black with fine transverse yellow lines at the bases of segments 2 and 3 and on the transverse carina? of those segments. A yellow spot on either side of the second segment. Legs black. In the males on each of the second pair of femurs are a number of short teeth directed towards the knee. On the third pair are 25 short teeth; of these the first eight or nine are directed towards the knee, then follow one or two not inclined, then eleven or twelve directed towards the trochanter, last one or two not inclined. In the females all the teeth on the hinder femurs are directed towards the knee. ZYGONIDIA MALAYANA, sp. n. Length of abdomen 34-5 m m . Length of hind wing 42 m m. Length of pterostigma 3-75 m m . Breadth of hind wing 13 m m. Wings hyaline, reticulation black, pterostigrua black, ruem-branule brownish grey. Fore wings. 16 antenodals, the last on the right side is discontinuous, that on the left continuous. 9 postnodals. Internal triangle divided into three cells, discoidal triangle crossed by a single nervule and followed by three rows of cells. Nodal sector waved at its middle. Two cross nervules in lower basal cells. Arculus between the level of the first and second antenodal. Hind wings. 10-11 antenodals, 10-11 postnodals. Discoidal triangle traversed, followed by two rows of cells. Sectors of triangle scarcely separate at their origin. Lower basal cell with a single cross nervule. Head. Labrum black, bases of the mandibles bright yellow. Rhinarium dull yellowish brown, nasus black along its ventral margin, for the rest yellow. Gena; yellow. Frons and tubercle metallic violet, but frons yellow at the sides. Tubercle truncate anteriorly, occipital triangle black. Prothorax brown, posterior lobe with a rounded backwardly directed projection at the middle of its posterior margin. Thorax metallic green, marked with dull yellowish brown as follows :-a fine line along the mid-dorsal carina; a lateral band |