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Show 134 MR. R. I. POCOCK ON THE SCORPIONS [Mar. 18, having the vesicle strongly infuscate and a very conspicuous V-shaped testaceous mark on the tergites. By this last character also it may be recognized from U. fallax (Koch) and U. striatus (Koch). From U. triangulifer (Thorell) it may be at once separated by the absence of the longitudinal bands on the upper surface of the abdomen ; moreover, Dr. Thorell in his elaborate description makes no mention of the enlargement of the basal pectinal tooth. UROPLECTES FORMOSUS, sp. n. (Plate XIII. fig. 3.) Colour variegated black and orange-yellow, cephalothorax with tubercle and ante-ocular area wholly black ; the lateral portions marked with oblique testaceous bands and the posterior half with transverse testaceous bands; the side margins black; abdomen above with black side margins; marked throughout its extent by two parallel wide black bands alternating with three (one median) narrower yellow bands ; the black spot on each of the tergites bears faint indications of the pale V-shaped mark, which is so characteristic of the species of this group ; under surface of trunk mostly pale, the posterior abdominal sternite only being deeply infuscate at the sides, with a pale black-lined triangular area in the middle behind ; tail with four first segments wholly pale above, with a median thin black line and black patches below ; fifth segment deeply infuscate below and above, but paler in the excavation above ; vesicle deeply infuscate, but marked with paler bands ; aculeus pale at the base, darker at the apex; palpi with almost pale humerus and brachium, each of these segments being only marked above with two irregularly shaped patches of colour ; the manus marked with black lines, the spaces between these lines more or less infuscate ; dactyli wholly pale : anterior surface of the legs strongly variegated with black ; the maxillce of the first and second pairs infuscate. Cephalothorax with anterior margin nearly straight, the central depression deep behind, shallow in front and over the ocular tubercle ; the ocular tubercle with the area immediately at the sides and in front of it wholly smooth, the posterior half weakly and somewhat closely granular. Tergites. First six almost smooth, marked only with a few lateral granules and a row of granules along the hinder margin ; the median keel abbreviated in front and behind and smooth ; the seventh tergite rougher than those that precede it; very finely and closely granular in the centre behind, more coarsely and sparsely granular at the sides ; the lateral keels short, but coarsely granular, the median elevation low and smooth. Sternites entirely smooth ; sparsely hirsute. Tail robust, widely and deeply excavated above and very feebly granular ; fifth segment deeply depressed above and behind; superior keel well marked and granular on the first three segments,the terminal granule being large and tooth-like; superior keel wholly absent on the fifth and represented on the fourth by large granules suhserially arranged; the superior lateral keel becomes progressively weaker from before backwards, being scarcely visible on the fourth segment |