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Show 70 MR. F. F. LAIDLAW ON THE [Feb. 4, CALOTHEMIS BIAPPENDICULATUS Selys. Calothemis biappendiculatus, Kirby, Cat. Odonata, p. 42. o*. Length of abdomen 22 m m . Length of hind wing 28 m m. Wings hyaline, slightly tinged with yellow at their bases. Pterostigma black, 2 m m . in length, covering 3 cells. Fore wing. 19 antenodals, the last continuous, 9-10 postnodals. Discoidal triangle traversed, followed by two rows of cells. 2 supra-triangular cross nervules, 2 cross nervules in the lower basal cell. Internal triangle divided into 3 cells. Hind wing. 2 supra-triangular, 3 lower basal cross nervules. Discoidal triangle traversed. Head. Lower lip yellow, upper lip black, eyes brown, occipital triangle black, rest of head steely-blue black except a yellow mark at the side behind each eye. Prothorax black. Thorax black above, dull brown below. Legs brown. Abdomen. Segments 1 and 10 black, the rest bright red. Segments 2-3 with transverse carina. Segments 3-9 strongly triangular in cross section. Rising from the bases of the genital ramules are two long branches, standing at right angles to the body. 2 unknown. I took two specimens of this insect at Kwala Aring. They differ from the type in having the upper surface of the thorax rich black instead of brown. Otherwise they closely resemble it, especially in the very remarkable genital organs on the second abdominal segment. •ORCHITHEMIS PULCHERRIMA Brauer. Orchithemis pulcherrima, Kirby, Cat. Odonata, p. 42 ; Karsch, Abh. v. d. Senckenberg. Nat. Gesell. xxv. 1. p. 228. Singapore (Ridley). Malacca (Selys). DIPLACODES NEBULOSA (Fabr.). Diplacodes nebidosa, Kirby, Cat. Odonata, p. 42. A single specimen was taken at Kota Bharu, Kelantan. There are specimens in the British Museum taken by Ridley in Province Wellesley. Widely distributed in the East Indies. ACISOMA PANORFOIDES Ramb. Acisoma panorpoides, Kirby, Cat. Odonata, p. 43. Kwala Aring. One specimen, d1 • Tropical regions of the Old World. TETRATHEMIS HYALINIA Kirby. Tetrathemis hyalinia, Kirby, Cat. Odonata, p. 44. The two species of this genus which are represented in our collection exhibit a veiy remarkable sexual dimorphism which has not, I believe, previously been remarked. The males have a |