OCR Text |
Show 1902.] DRAGONFLIES OF T H E " SKEAT EXPEDITION." 89 broader above, runs from below the hinder pair of wings to behind the third pair of legs. The blue sides are margined postero-ventrally with a black line. Lower surface black, with two broad blue marks behind the legs. Abdomen black. Segments 1-9 with triangular blue spots on either side, their bases resting on the hinder margin of each segment. Those in 2-3 extend the whole length of their segments, that in 4 for half the length of that segment, the rest are small. Anal appendages black. Legs black. The two hinder pairs of femurs and tibias are white on their inner surface. Wings tinged with yellow, blackish in the costal area from the fifth postnodal cross nerve; from about three-fifths the distance between the nodus and the black pterostigma the apical portion of the fore wing is purplish brown to the tip, except along its lower margin, where it is dusky grey shot with iridescent green. The purple mark commences suddenly and its inner margin slopes outwards from in front. The outer half of the lower wing is also marked with brownish purple, the extreme apex and the posterior margin excepted, these are greyish brown. The inner border of the purple mark is Straight, and the mark is crossed by two rows of iridescent hyaline spots. The inner row consists of three spots. The upper of these, consisting of one row of cells, lies above the nodal sector; the second, consisting first of one and later of two rows, lies between the subnodal and median sector; and the third, above the upper sector of the triangle, consists of a single row of cells. The upper spot is nearest to the base of the wings, the lowest is furthest from the base. The first row lies at a level of about half of the distance between the nodus and pterostigma. The second row consists also of three spots. The upper is the largest and its distal end just overlaps the pterostigma. It consists of two, followed by three or four rows of cells, and is placed in series with the upper spot of the first row. The lowest spot of the outer series is placed serially with the middle spot of the inner series, whilst the middle spot of the outer series, consisting of a single row of cells, lies between the two others. There is also a hyaline spot just at the mieldle of the hind wing consisting of a single row of cells, this impinges on the inner margin of the brown spot. 2 . Head as in the male, with the following additional marks yellow : four spots on the dorsal surface of the ' snout' and the second joint of the antenna?, the upper half of the epistome. The gena? are marked with greenish blue in the male and yellow in the female. Prothorax black, with lateral yellow and a fine mid-dorsal yellow spot. Thorax black, mesothoracic carina orange; a fine orange line running to the base of the first pair of wings between the carina and the humeral suture on either side, this latter is also yellow |