( 415 ) XVIII. Oil the South American species of Diabrotica. Part ir. By Charles J. Gahan, M.A., F.E.S., Assistant in the Zoological Department, British Museum. [Read July 1st, 1891.] The present paper is intended to serve as a continuation of one on the same subject by the late Mr. Joseph S. Baly, F.L.S., &c., which appeared in the first Part of the ' Transactions' of this 8ociety for the year 1890. A few words in explanation of the circumstances under which I have been induced to write it may not be out of place. Mr. Baly's collection of Galerucidce having passed into the possession of the British Museum, I have been entrusted with its arrangement and incorpora-tion. A number of manuscript descriptions of species — the result of Mr. Baly's work towards a completion of his monograph — was handed over to my care. As this manuscript was in an unfinished state, and without arrangement, it could not with advantage be presented for publication. I have endeavoured instead to complete this second part of the paper, and have included in it nearly all of Mr. Baly's manuscript descriptions. These are clearly indicated in the text, so that Mr. Baly's share of the work may be easily distinguished from my own. I have omitted a few descriptions, having been unable in such cases to satisfy myeelf as to the identity of the species. Except in a few instances, I have had to add the references to previously published short diagnoses or descriptions. In the arrangement of the species I have endeavoured to make use, as far as possible, of structural characters. In grouping many of the species, however, I have had to rely upon a general resemblance in facies or colora-tion. TUAN'S. ENT, SOC. LOND. 1(S91. PART III. (OCT.)
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