( 21 ) \ III. A Revision of the Genus Diplatys, Serv. (Dermaptera) By Malcolm Burr, D.Sc, F.L.S., F.Z.S., F.E.S. [Read April 6th, 1910.] Plates VII, VIII. In working out the Dermaptera for the " Fauna of British India " series, I was surprised at the number of undescribed species oi Diplatys which came to hand. Six species, including African and American, were in-ckided by de Bormans in his monograph of the Dermaptera in 1900, yet in India alone we have now double that number, of which ten were described by myself, seven of them in the Indian monograph. A considerable number from other parts of the world rendered necessary a thorough revision of the genus. The synonymy has now been to a great extent cleared up, and there are no less than 33 species already known to science, including those first described in these pages. In 1904^ I tentatively proposed a first attempt at a classification based on structural characters, and I have found this quite serviceable when elaborated to receive the recently discovered species. It is quite certain that there remain a very great many new forms yet to be discovered, and very probably the number of described species will be doubled within the next few years. Exceedingly valuable characters are afforded by the subanal plate, or penultimate ventral segment. This may be entire, emarginate, or more or less lobed. The latter is the rarer shape : there is a small rectangular lobe in D. angustatus, and in D. nigriceps there is a small obtuse convexity. In D. conradti and D. hormansi there is a small round emargination, but the outline is more complex in D. gerstaecJceri, D. ernesti, D.fiavicoUis, and D. siva; in the latter there are two round emarginations, with a smaller obtuse emargination between them, so that there projects a trans-verse, sinuate lobe between the two deep incisions. In TRANS. ENT. SOC. LOND. 1911. — PART I. (MAY)
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