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Show 1888.] INSECTS OF CHRISTMAS ISLAND. 549 LOCUSTIDJE. P R I M N I A (?) ORIENTALIS. Exp. al. 44 millim.; long. corp. 26 millim. Grass-green; antennae about twice as long as the head and pronotum, yellowish (faded?), the tips brownish; tips of mandibles and palpi dark green ; vertex with four dusky lines approximating in front, the inner ones much nearer together than the space between these and the others ; the transverse grooves on the pronotum black, the first shorter than the others, and ending in a dusky spot on each side, behind which is another dusky spot (between the second and third grooves) ; the second groove is angulated forwards at its extremities, ending in blackish spots; before the first groove runs a transverse reddish line, only distinct on the sides. Abdomen blackish above, green on the sides and beneath ; a large dark green spot beneath, towards the extremity of the 8th segment. Elytra green, with many of the longitudinal nervures yellowish ; the intermediate spaces inclining to hyaline beyond the middle. Wings smoky hyaline, with brown nervures; costal nervure yellow, and the nervures at the base and alone: the inner margin grass-green. Spines short, tipped with black, as well as the claws. I refer this insect to Primnia, Stal (the type of which is from St. Helena), with some doubt. " Flew into light in tent, October 9th." CYRTACANTHACRIS FUSILINEA, Walk. (?). Cyrtacanthacris fusilinea, Walk. Cat. Derm. Salt. iii. p. 564. n. 30 (1870). I am not quite certain that the specimen from Christmas Island is identical with Walker's species from Ceylon; but it closely approaches it, and as there is only a single specimen from the former locality, and that not in very good preservation, I have been unwilling to describe it as new. CYRTACANTHACRIS DISPARILIS, sp. n. Exp. al. 8 90 lin., $ 115 lin.; long. corp. 8 54 lin., $ 80 lin. Male. Head and body yellow, inclining to reddish above ; antennae with the first two joints yellow, the remainder black above, beneath pitchy or yellowish ; tegrnina longer than the abdomen, yellow; the longitudinal veins darker; towards the tip the membrane becomes nearly hyaline, and many of the nervures are brown. Wings smoky hyaline, the nervures towards the base and costa yellow, the remainder brown; the nervures immediately at the base incline to reddish. Legs yellow, darker above ; tarsi inclining to reddish ; the joints sometimes marked with green; claws black at the tips ; hind femora with three carinae above, with short and distant serrations ; these and the lower lateral carina are irregularly marked with black ; the intermediate space above is slightly reddish, more so at two points than in others, which gives the appearance of two interrupted bands, Sutures of the knee-joint black. Hind tibiae with a green |