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Show 284 REV. O. P. CAMBRIDGE ON N E W ARANEIDEA. [Mar. 4, brown, marked and spotted with yellow. The sigilla are all red-brown, very small, especially the anterior ones, which are 10 in number. The cephalothorax is black, and the legs are black-brown. Hab. Mauritius. (Received from R. H. Meade, Esq., of Bradford.) Possibly this is Gasteracantha (Plectana) mauricia, Walch. GASTERACANTHA CALLIDA, sp. n. (Plate XXVL fig. 7.) Length of the transverse diameter of the adult female, exclusive of the spines, 5| lines ; length of the longitudinal diameter 3 lines. This is another species of the "fornicata" group: the anterior margin of the abdomen between the two foremost spines forms a nearly even curve ; the foremost spines are short and very slightly (in one example not at all) directed forwards. The intermediate spines are stout, scarcely curved, double the length of the anteriors, rapidly tapering from base to point, and but slightly directed backwards. Tbe posterior spines are as long, but not so strong, as the intermediate ones ; in one example, however, the posterior spines were shorter. The cephalothorax is black, the legs black-brown, and the abdomen yellow-brown, the spines reddish ^brown, and the sigilla small and like the spines in colour. The different form of the fore margin of the abdomen and the stouter intermediate spines will at once distinguish this Spider from the next species, G. flebilis. Hab. Trinidad. GASTERACANTHA FLEBILIS, sp. n. (Plate XXVL fig. 8.) Length of the transverse diameter of the female (adult ?), exclusive of the spines, 4 lines ; longitudinal diameter slightly over 2 lines. This spider is allied to G. fornicata, C. L. Koch"; it is, however, much smaller; and though it may possibly be an immature example of that species, I am inclined to think it is distinct. Owing to the specimen being pinned and dry, I am unable to say positively whether it is adult or not; but I think it is. The anterior spines are short and directed a little forwards ; the intermediate ones stout, not very tapering, double the length of the anterior, and with a distinctly backward direction. The cephalothorax, falces, and legs are deep brown-black ; the abdomen dull brown, with two transverse black bands, of which the anterior is the broadest: the posterior band appeared to be interrupted in the middle; but as the pin had passed through that point, this is not certain; the spines are red-brown. Hab. Sarawak. GASTERACANTHA HARPAX, sp. n. (Plate XXVL fig. 9.) Length of the transverse diameter of the adult female, exclusive of the spines, rather over 5£ lines; length of longitudinal diameter rather more than 3 lines. This Spider is also of the "fornicata " group. It may be easily known by the weakness of the intermediate spines, which are scarcely double the length of the anteriors, and no stronger, if, indeed quite so strong, and project at right angles to the longitudinal axis'of the |