Mr. A. G. Butler on the Genus Phrynus. 117 XVII.-— A Monographic Revision of the Genus Phrynus, with Descriptions of Four remdrkable new Species. By Arthuk Gardiner Butler, F.L.S., F.Z.S., &c. [Plates VI. & VII.] The last list of the species of Phrynus was that published by Gervais in the third volume of his ' Apt^res ; ' since then the two Kochs, Horatio Wood, and M. Lucas have all added spe-cies, bringing the total number of known forms up to twenty; one or two of these, however, will probably prove synonymous with species previously described. In the present paper I have added four new species, one of which possesses the cha-racter, hitherto unknown in the genus, of a strongly serrated front margin to the cephalothorax. In all published descriptions of Phrynides I have found one very important character overlooked, namely the arrangement of the teeth in the mandibles. This character will alone serve to distinguish most of the species, and therefore should not be neglected. The mandibles are easy to extract from dried specimens, whilst with specimens in spirit this is unneces-sary, for they can be drawn forward and examined without difficulty. I have sketched the mandibles of most of the species in the collection of the British Museum ; and I find that all the New-World forms are characterized by the distinct bifurcation of the first tooth in the lower mandible, this type of tooth being rare in Old-World species. The toothing of the upper man-dible differs more or less in the bulk of the species, even be-tween species in which the toothing of the lower mandible is identical. Genus Phrynus, Olivier. American Species. 1. Phrynus cheir acanthus. PI. VI. fig. 1. Phrynus cheiracanthus, Gervais, Brit. Miis. 1842; Soc. Phil. Paris, in Journ. I'Inst. p. 72 (1842) ; Apt. iii. p. 3. n. 3 (1844). Hah. Type, Demerara {Bowers) ; New Granada [Stahl-schmidt). B.M. 2. Phrynus (j/orgo. Phrynus qorqo, Wood, Trans. Am. Phil. Soc. vol. xiii., n. s., p. 440 (1869)." Hah. " Peru " ( Wood) ; Par^ ? B.M. We have one example of apparently this species, larger than
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