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Show 1890.] OF THE FAMILY BUTHID.E. 119 is, in my opinion, very much to be deprecated, I have added Tityus to the synonyms oi Lsometrus, and have taken Peters's name Uroplectes for the species which Thorell called Tityus. This, however, I have done on the authority of Dr. Karsch, who in a footnote to his table of genera says that Uroplectes is synonymous with Tityus in Dr. Thorell's sense of the word. Presumably this statement is made after an examination of the type of Uroplectes, namely U. ornatus. If this, however, be not so, it will be well to bear in mind that there is nothing in Peters's diagnosis of ornatus to show that the species is not referable to Lepreus. In that case Lepreus will have to rank as a synonym of Uroplectes, and a new generic name will have to be established for the species here included under Uroplectes, unless the alternative be adopted of considering all the species of Lepreus and Uroplectes as referable to one genus Uroplectes1. Genus ISOMETRUS, Ehrb. lsometrus, Ehrenberg, Symb. Phys. (Scorpiones), p. 3, pi. i. fig. 3 (1829)-type filum = maculatus (De Geer). Tityus, C. Koch, Die Arach. iii. p. 33 (1836)-type baliiensis(¥exty). Pilumnus, id. Arach. Syst. p. 38 (1837) (iiom. praeocc). Lychas, id. Die Arach. xii. p. 1 (1845)-type maculatus (De Geer). Atreus, Gerv. Apt. iii. p. 52 (1844) (in part), not of C. Koch, 183/, Centrums, Peters, Monatsb. Ak. Wiss. Berlin, 1862, p. 512 (in part). Lsometrus, Thorell, Etudes Scorpiol. p. 9 (1876) (and subsequent authors). Phassus, id. ibid. Androcottus, Karsch, Mitth. Munch, ent. Ver. p. 11 (1879). Hab. Tropical countries. Inferior border of the immovable digit of the chelicerae armed with a single tooth. The external series of teeth on the digits of the chelae formed by the assumption of a more or less transverse position of the posterior one or two enlarged teeth of the median rows; the internal series of teeth formed by the enlargement and separation of the anterior tooth of each of the median rows ; but this separation is never carried to any great extent. In most of the Old-World species the median rows scarcely overlap each other ; but in the larger American forms, such as L. androcotloides, the rows overlap to such a degree that the anterior extremity of any one reaches the middle of the row in front of it. The cephalothorax is usually without well-developed keels; the tergites are nearly always provided only with a median keel; the tail is, as a rule, keeled above and below, and the vesicle is nearly always provided with a strong spine beneath the aculeus. The sexes generally differ considerably and in a variety of ways : thus the male oi L. messor and of I. maculatus has long chelae with slender hands and a long tail . L. tricarinatus has short chelae with thick hands and a long tail; /. mucronatus (varius) has a thick hand 1 I have refrained from definitely uniting the two genera, because pilosus the type of Lepreus, is unknown to me. |