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Show 82 MR. F. F. LAIDLAW ON THE [Feb. 4, citron-yellow spot between the first pair of wings. Ventral surfaces and legs rich black. The legs are robust, rather short; hindermost pair of femurs with stout spines. Abdomen somewhat dilated at its base, then segments 3 to 6 long and cylindrical, segments 7 to 9 compressed laterally, 10 very short. Black, with yellowish marks as follows:-on segment 2 a lateral spot, the auricles, and a very small dorsal lozenge-shaped mark. Segment 3 has a trace of a yellow spot on either side and a very fine mid-dorsal line. The basal third of segment 7 with a large dorsal mark. Anal appendages black, resembling those of G. T-nigrum very closely. Coloration generally remarkably similar to that of a specimen marked Macrogomphits quadratus in the British Museum. A single male from forests at the foot of Gunong Inas. This fine species differs from other members of the genus GomjJiidia in having its wings of equal length with the abdomen. It appears, moreover, to be the largest known member of the legion Lindenia. The internal nervule of the pterostigma can hardly be said to be prolonged, but this character is scarcely of sufficient importance to justify the removal of this species from the genus Gompthidia. The form of the anal appendages and the absence of any leaf-like dilatation of the sides of segments 7 or 8, as well as the shape of the vertex, indicate that it must be referred to this genus, of which it may form a new section. Legion GOMPHOIDES. SIEBOLDIUS GRANDIS Kriiger. (Plate VI. figs. 3, 3 a, 4.) Sieboldius grandis, Kriiger, Stett. ent. Zeit. 1898, p. 311. I refer to Kriiger's species a fine male, which agrees in size, wing-characters, and coloration fairly closely with the females described by him from Sumatra. Total length 83 mm. Length of abdomen (without appendages) 59 Length of appendages (upper pair). 2 Fore wing, length 55 ,, breadth 12 Hind wing, length 52 ,, breadth 15 Pterostigma 5-5 Femur of last pair of legs 20 Tibia ,, ,, 14 Breadth of head *. 11 Antenodal cells of fore wing 22-23, postnodal 18-19 ; of hind wing 16-17 and 17 respectively. Pterostigma lies over six cells. Basal subcostal nerve present in all wings. Triangles of all four wings with one cross riervure. The middle thirds of all the wings |