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Show 72 MR. F. F. LAIDLAW ON THE [Feb. 4, line following the transverse carina in 3-4. On segment 7 a dorsal yellow spot divided longitudinally by the black mid-dorsal carina. Traces of a transverse carina are present on segment 5. The abdomen is slightly dilated at its base, but from segment 4 onwards very slender. Coloration in the female as in the male. The traces of a transverse carina in segment 5 are more distinct laterally. The abdomen is broader and of practically equal circumference throughout. In the male there are on the antero-inferior surface of the femur 17 short curved teeth directed towards the knee, and increasing in size distally very gradually. These are followed by three straight spines inclined in the same direction; the first of these is the shortest and the last the longest. The third femur is provided on the antero-inferior surface with a row of 23 thorn-like teeth with their apices directed away from the knee. These increase gradually towards the distal end of the femur. •NANNOPHYA PYGM^EA Ramb. Nannophya pygmcea, Kirby, Cat. Odonata, p. 45. The British Museum has a number of specimens of this species from Singapore. Genera of uncertain position. NEUROCENA IDA Hagen. (Plate Y. fig. 1.) Zygonyx ida, Hagen, Yer. Ges. Wien, xvii. p. 62 ; Brauer, op. cit. xviii. p. 370 & p. 742; Selys, Ann. Soc. Ent. Belg. xii. p. 96; id. Ann. & Mag. Nat. Hist. (4) iii. p. 274; id. C. R. Soc. Ent. Belg. xxxv. p. ccxxvii. Pseudomacromia luxuriosa, Karsch, Berl. ent. Zeitschr. xxxviii p. 21. Zygonyx ida, id. Ent. Nachr. xxi. p. 203; Calvert, P. Ac. Philad. 1899, p. 246. Neurocena ida,, Kirby, Ann. & Mag. Nat. Hist. (7) v. p. 541. This appears to be an exceedingly variable species, and the single specimen I obtained differs to a certain extent from those described hitherto, so that it seems worth while to give a fairly full account of it. The length of the hind wing is 42 mm., of the abdomen 38 m m . The wings are hyaline, faintly tinged with yellow, which becomes vivid towards the outer extremities of the fore wings. In a male in the British Museum Collection the wings are almost colourless. The reticulation is black. Fore icings. 14 antenodals; on the left side the outermost is continuous, on the right side discontinuous. 7 to 8 postnodals. Internal triangle of both wings free, discoidal triangle free. (The internal triangle is usually divided into two or three cells • de Selys states that in two females examined the discoidal triangle |