( 136 ) XVI. British Species of the Genus Stenus. By Messrs. G. R. Waterhouse and E. W. Janson. [Read 1st January, 1855] In the paper which we have now the honour of laying before the meeting, we originally proposed to furnish a list of the British species of the genus Stenus, as identified with the descriptions in Erichson's " Genera et Species Slaplu/linorum," but subsequently we thought it desirable to append to the last our determination of the species of Stenus contained in the collection of the late Mr. J. F. Stephens as well as in that of the Rev, VV. Kirby. To render the list as perfect as possible, we have been kindly assisted by the loan of the entire collection of Stenidce of several of our most assiduous Entomologists, and we have especially to thank Messrs. Wollaston, J. Curtis, and S. Stevens for such assistance. With regard to the Stephensian collection (now in the British Museum), it is desirable to state, that the specimens which Mr. Stephens used to call his " Type specimens"' are almost always marked by some kind of ticket attached to the pin holding the insect. The Marshamian specimens are thus marked by a round yellow ticket; and when the species is described in the '■^Entomologia Brilannica,'' a number will be found on the under side of the ticket, corresponding to the number of the species in that work. Other type specimens are either marked by a round white ticket without a number, or by a small square ticket with a number. Mr. Stephens' own species are not marked. The species follow in succession, in the cabinet, in accordance with the descriptions in the " Ilhistralions," but in one or two instances there have un-doubtedly been some accidental transpositions ; and to prevent further changes of this nature, all the species, and indeed nearly all the specimens, have now been numbered to correspond with the numbers of the species as given in the " Manual." The numbers here alluded to are on small oval tickets attached to the specimens, and it is to these numbered specimens that we more particularly refer in the notes which are contained in this com-munication. The paper is divided into two parts : the first containing a list
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