202 Mr. F. Walker on some undescribed Ceylon Insects. believe we have a proof in twelve females of Maia Squinado, iso-lated in a basin, all of which have produced eggs a second time without another copulation, at the very moment when the last eggs of the preceding gestation had been hatched. Such, amongst the numerous facts which we have observed, are those which I have thought it advisable to communicate at present to the Academy. At a subsequent meeting we shall present the general results of our observations upon the first metamorphoses of the Crustacea. From these observations it results that all the known Zoeas described by various authors are the larvae of Brachyurous Decapods, and that it is not de-monstrated that the typical Zo'ca of Bosc is, as usually supposed, an embryo of the Edible Crab of our coasts, and still less of the Lobster. In order that the investigations which have furnished us with these facts may not be interrupted during our absence, the pilot Guillou keeps a register, in which, in conformity with instruc-tions drawn up beforehand, and which he follows with sagacity, he inscribes, at the number corresponding to each cell, whatever bears upon the experiments carried on therein. As soon as an interesting fact is exhibited, he informs us of it ; and if the fact be of a nature capable of verification in Paris, he sends us the animals presenting it ; in the contrary case, one of us goes to Concarneau to study the phenomenon on the spot. XXIII. — Characters of some apparently undescribed Ceylon In~ sects. By F. Walker. Order COLEOPTERA. Fam. Cicindelidse. Cicindela discrepans. Atra, elytris guttis duabus humeralibus vittisque duabus postice macularibus flavis, femoribus cupreis. Long. 6^—8 lin. Tricondyla femorata. Nigra, transverse rugulosa, prothorace sublineari antice coarctato, femoribus piceis, tibiis tarsisque cya-neis. Long. ]0 lin. Fam. Carabides. Cymindis rufiventris. Ater, nitidus, antennis piceis, thorace sulcato, abdomine subtus rufo, elytrorum sulcis parallelis punctatis bene determinatis, pedibus piceis, femoribus crassis. Long. 4 lin. Dromius margin ifer. Niger, nitidus, subtus piceus, palpis an-tennisque fulvescentibus, thoracis lateribus rufescentibus, elytro-rum maculis duabus magnis humeralibus duabusque minoribus posticis discalibus rufescentibus. Long. 2£ lin.