Trechus Flavomarginatus

Thomas Vernon Wollaston published this drawing in his book ‘Insecta Maderensia’ in 1854. In the book he thanks Westwood for providing the illustrations, ‘Particularly, however, would I draw attention to the valuable help which I have received from J. O. Westwood, Esq., whose pencil has been so elaborately employed in the figures which I am thus enabled to attach, and by whom many of the minutest of the dissections were accomplished, — with a degree of delicacy, moreover, to which I did not myself at the commencement of this Work (though I have since succeeded in anatomizing the larger portion of them, likewise) lay claim.’

48. Trechus flavomarginatus, Woll. (Tab. II. fig. 2.). Wollaston wrote the following about this species:

‘Apparently the most abundant of all the Trechi peculiar to these islands ; and it may perhaps be regarded as especially characteristic of the Madeiran type, — occupying somewhat of a central position from which most of the others would seem to radiate. [...] It is essentially a sylvan insect, ranging from about 2000 to nearly 5000 feet above the sea, and abounding throughout the wooded districts in most parts of the island. I have observed it in great profusion at the Ribeiro Frio, during the spring and early summer; at the Lombo dos Pecegueiros, and at the Cruziuhas, in July ; and at the Feijjaa de Corte in August ; and I have likewise captured it in the Boa Ventura in January. It would appear to attain its maximum at an altitude of from 3000 to about 4000 feet : and in the upland region of the Fanal it is comparatively scarce,—its place being there supplied by the T. custos, which is the prevailing species. The var.β. I have hitherto only taken in the Boa Ventura and at the Cruzinhas. ‘