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Mr. J. Nietner on new Ceylon Coleoptera. 1 75 objects, by far the greater number are limited to tropical seas. A notion seems to prevail that the floating species are also almost entirely natives of the warmer-temperate and tropical regions of the ocean, and that specimens picked up in northern regions are wanderers that have been carried beyond their proper range. It is desirable to ascertain to what extent this is the case. Edinburgh, July 17, 1858. XVIII. — Descriptions of new Ceylon Coleoptera. By John Nietner, Colombo, Ceylon. [Continued from vol. xx. Ser. 2. p. 375.] Family CARABIDjE. Tribe Trigonotomid^e. The Trigonotomidse with an elliptic terminal joint of the palpi are abundantly represented amongst the Ceylon Carabidse, thus making amends for the want of other tribes of the section to which they belong. I have now before me a great many indi-viduals of different species which I have endeavoured to distri-bute into genera, after the works of Lacordaire, Dejean, and others of less importance. A single glance almost convinced me that they must belong either to Abacetus, Distrigus, or Drimo-stoma, — genera closely allied, and whose principal, in fact only essential, distinction would appear to consist in the shape of the mentum-tooth. If it is a well-established fact, as cannot be doubted from the above authors, that this tooth is pointed in Drimostoma, — large, rounded, equalling the lateral lobes in Aba-cetus, and large and truncated in Distrigus, the species described below could not, as to their genera, be distributed otherwise than I have done, — namely five to Distrigus and one to Drimostoma. The species which I have drawn to the former genus have a large, more or less square tooth, slightly rounded at the anterior angles. It is impossible to call this tooth pointed in any of the five species ; they cannot therefore belong to the genus Drimo-stoma ; nor can any of them be drawn to Abacetus, which genus is, moreover, apparently exclusively African. As to the insect which I have placed in the genus Drimostoma, its mentum-tooth is not exactly pointed, but it is altogether narrower than in Distrigus, and might well be called "assez aigue," as Dejean describes it. This insect differs, moreover, very materially in general appearance, as well as in its details, from my Distrigi; and I feel sure that it belongs to the genus in which I have placed it, although it does not quite agree with Lacordaire's



Descriptions of new Ceylon Coleoptera

J Nietner
Annals and Magazine of Natural History (3) 2: 175-183 (1858)

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