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. 



