276 Mr. C. O. Waterhouse on Although I have referred this species to Scotosia, this action is but tentative ; like nearly all the large genera of moths, Scotosia will have to be subdivided, and the form of the wings (especially of the primaries*) in the male of this species will then probably entitle it to rank as a distinct genus. XXXII. — Coleoptera collected during the Exijedition of H.M.S. ' Challenger.'' By Charles O. Waterhouse. The present paper has reference only to the Coleoptera col-lected at Tristan d'Acunha, Ki Dulan, Aru Islands, and Tahiti. TRISTAN D'ACUNHA. Carmichael, in his " Description of Tristan da Cunha " (Tr. Linn. Soc. xii. pp. 497-8), says, " The only insects I ob-served are three small species of Carcidio, four Phaloina^ one Hippohosca^ two oiMusca^ one of Tipula.'''' Probably the Curculionidse referred to may be those de-scribed below as Palcechthus and Pentarthrum. Lancetes varius, Fabr. Hah. Inaccessible Island. The eight specimens received are a trifle longer and nar-rower than the Chilian specimens ; they have the anterior margin of the thorax pitchy, and the fuscous spot at the base extends beyond the middle of the thorax. The sterna and posterior coxa3 are pale. All the Chilian specimens in the Museum collection have the sterna and coxae blackish, and the fuscous marks on the thorax, when present at all, are very small. The Fabrician type from Patagonia has the thorax entirely yellow as well as the sterna and posterior coxte. Babington's types, described as Colymhetes nigro-rematuSj from Port Famine and Port Desire, have scarcely any trace of the spots on the thorax, but liave the sterna and cox£e black, Mr. Sharpe, in his monograph of the Dytiscidse (Sci. Tr. R. Dublin Soc. ii. 1880-2, p. 604), under Laticetes praimorsus (the name he adopts for the species) gives Bolivia and Monte Video as additional localities. Gercyon littorale, Gyll. Hah. Inaccessible Island. Two examples agreeing with European specimens. * The male primaries are formed as in the genus Chesias.