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Show 172 MR. A. G. BUTLER ON THE GENERA [Feb. 4, One specimen of this species, as well as of P. plicifera, was obtained by Dr. Meyer at Laguna del Bay. millims. Total length 32 Fore limb 20 Hind limb 60 Distance between vent and heel 33 Fourth toe 17 4. A Monographic Revision of the Genera Zephronia and Sphcer other turn, with Descriptions of new Species. By A R T H U R G. BUTLER, F.L.S., F.Z.S., &c. [Received December 11, 1872.] (Plate XIX.) In the ' Annals and Magazine of Natural History' for last November, I added eighteen species to these two genera. Subsequently I have been favoured by Mr. Wilson Saunders with a sight of his collection, in which I have discovered two new Spheerotheria; whilst a recent examination of the Banksian Collection in the British Museum has brought to light two examples of a fine new Zephronia. As I have had some little difficulty in determining the species of these two genera, owing to their great similarity one to another, I have thought that it would facilitate the study of the group if I were to draw up a synonymic list of the described species, grouping them into sections founded upon well-marked structural characters. In the case of some of Brandt's species (the original descriptions of which I have hitherto sought for in vain under the guidance of the references given in Gervais's 'Apteres'), I have given translations of the diagnoses as cited by M . Gervais. This I have, however, only done either when the species described is unknown to me, or when certain characters mentioned by the author indicate to which of m y sections the species belongs. I have been obliged to rename one of the forms figured by Koch in his ' Die Myriapoden,' inasmuch as it does not agree with Brandt's description as cited by Gervais. The number of species now described in the two genera will amount to fifty-one. Order A P T E R A. Suborder M Y R I O P O D A . Division C H I L O G N A T H A . Family G L O M E R I D C E , Gervais. Genus S P H C E R O T H E R I U M , Brandt. Div. 1. Last dorsal segment having a more or less distinct external rim. Sect. a. Anterior portion of the last segment abruptly thickened. 1. SPHcEROTHERIUM R O T U N D A T U M. Sphcerotherium rotundatum, Brandt, Bull. Nat. Mosc. pl. 6, p. 198. n. 1 (1833) ; Koch, Myriapoden, i. pl. 19. f. 38 (1863). |