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Show 1S89.] MR. W. F. KIRBY ON NEW ODONATA. 297 the black of the wings has become first blue-black, then brightly shot with bluish purple, and finally streaked at the base with metallic blue and green. Then, again, if the white of the secondaries was first modified into yellow and orange as in Bracca and Prcesos (in which the primaries are still black and white), one can see how the bands on the primaries of Milionia drucei and M. snelleni, if derived from such a source, may have remained orange after those of the secondaries had become vivid crimson. It has been said that colour is of no value as a guide in classification, but I am not at all sure that, if the natural order of its development were strictly looked to, it would not be of assistance in guiding one to a judicious arrangement of allied genera. EXPLANATION OF PLATE XXXI. Fig. 1. Bracca bajula.ria, p. 294. 2. Craspedosis extenuata, p. 295. 3. Lithopsyche av-tiqua, from the typical specimen, p. 294. 4. Fore wing of Prcssos mariana, p. 294. 5. Calospila leucomela, p. 295. 6. Restoration of Lithopsyche. p. 294. 3. Descriptions of new Genera and Species of Odonata in the Collection of the British Museum, chiefly from Africa. By W . F. K I R B Y , F.E.S., Assistant in the Zoological Department, British Museum, Natural History, S. Kensington. [Received April 26, 1889.] On looking through the collection of Odonata in the British Museum lately, I found examples of some very interesting species which appear to be undescribed, and which form the subject of the present paper. Among these, the most important is Tatocnemis malgassica, a species representing in Madagascar two remarkable Eastern genera, Priocnocnemis and Ldiocnemis, hitherto only known from the Philippines and New Guinea respectively. The following is a list of the genera and species which I propose to describe : - ODONATA. LIBELLULULE. LlBELI.ULIN/E. Orthctrum camarcnse, n. s Mthriamanta rezia, n. s. , vESIINID/E. GoMPIIINiE. Pseudogomphus (n. g.) insignis, n. s 2EsriNiN/E. Anax striatus, n. s Cameroons. Madagascar. Cameroons. Chili. |