Mr. T. V. Wollaston on Madeiran Coleoptera. 407 have the vascular bundles lying in the cambium-cylinder sepa-rated by very broad medullary rays. If we trace, for instance, the development of the stem of an Impatiens, we see that the cells of the medullary rays produced by the development of the cambium-ring become converted more and more into prosenchymatous cells, and that between them appear groups of vessels (but without spiral vessels), thus giving origin to new vascular bun-dles. Hartig* observed vascular bundles developed in the above-described secondary cambium-layer which appears in the medulla of Cucurbita. XLI. — On Additions to the Madeiran Coleoptera. By T. Vernon Wollaston, M.A., F.L.S. Fam. Carabidae. Genus Olisthopus, Dej. Olisthopus humerosus, n. sp. Olisthopus maderensis, var. fi, Woll. Ins. Mad. 35 (1854). humerosus, Schaum, in litt. It is not without some little hesitation that I am induced to register the present insect as specifically distinct from the O. maderensis, of which I have hitherto regarded it as an insular modification (although certainly a very curious one) peculiar to the rocks of the Dezertas. And I may add that it is through the strongly expressed opinion of my friend Dr. Schaum of Berlin, who has stated his belief that the peculiarities which it exhibits are too great to be attributed to any combination of the local influences to which it may have been long exposed, that I now record it under the new trivial name which he has suggested, — a title indicative of a character about its shoulders, which are a trifle more produced (and angular) than those of the 0. made-rensis. The other points in which it recedes from its ally may be at once gathered by a reference to the ' Insecta Maderensia/ Genus Stenolophus, Meg. Stenolophus marginatus. Stenolophus marginatus, Dej. Spec. gen. des Col. iv. 427 (1829). , Leon Fairm. Faun. Ent. Franc, i. 145 (1854). Two Madeiran specimens of this insect have lately come under my notice ; they were both captured near Funchal, one by Mr. M. Park, and the other by Mr. E. Leacock. The species * Bot. Zeitung, 1854, p. 31. 28*
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