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Show 1881.] ON THE GENERIC DIVISIONS OF THE BUCCONIDAE. 775 EXPLANATION OF PLATE LXVI. Fig. 1. Thwaitesia margaritifera, sp. n., p. 766. a, Spider in profile, enlarged, without legs or palpi; b, eyes, from in front; c, maxillae and labium ; d, left palpus, from outer side; e, right palpus, from outer side ; f, genital opening and process, from in front; g, ditto in profile ; h, natural length of Spider. 2. Eriauchenus workmanni, sp. n., p. 768. a, Spider in profile, enlarged, without legs or palpi; b, caput in profile, more enlarged; c, caput and falces, from in front; d, maxilla}, labium, and sternum; e, perspective view of caput and falces; /, Spider, of natural size. 3. Ariamnes attenuata, sp. n., p. 770. a, Spider, enlarged, in profile, with legs and palpus on one side only; 6, right palpus, from outer side ; c, caput in profile. 4. Mutina furcifera, sp. n., p. 771. a, Spider enlarged; b, caput and falces, from in front; c, natural length and breadth of Spider. 5. Bucranium taurifrons, sp. n., p. 772. a, Spider, enlarged ; b, caput, still more enlarged, from above aud behind ; c, outline of Spider in profile, enlarged ; d, caput and falces, from in front; e, maxillas, labium, and sternum; /, natural length of Spider. 6. Perissoblemma thomisiforme, sp. n., p. 774. a, Spider, enlarged; b, ditto, outline in profile ; c, caput, falces, and eyes, from in front; d, caput and eyes, from above and behind; e, maxillse and labium; /, posterior extremity of abdomen, from above, looking backwards, and showing the anal tubercle and transverse folds; g, natural length of Spider. 6. O n the Generic Divisions of the Bucconidae, together with the Description of a n e w Species of the Genus Nonnula. By P. L. S C L A T E R , M.A., Ph.D., F.R.S., Secretary to the Society. [Eeceived June 17, 1881.] As I now shortly hope to complete m y Monograph of the Jacamars and Puff-birds by the issue of the sixth and seventh parts of that work, I beg leave to lay before the Society a summary of the generic divisions which I have adopted in the latter family. It will be noticed that I have made as few changes as possible in the nomenclature generally used, although I have now found it necessary to distinguish two aberrant and little-known species by new generic names. In m y ' Synopsis of the Bucconidae,' published twenty-seven years ago, I divided the family into four genera, as follows :- 1. Bucco, Linn., with 15 species. 2. Malacoptila, G. R. Gray, with 12 „ 3. Monasa, Vieill., with 4 „ 4. Chelidoptera, Gould, with 2 ,, Total 33 species. In the new illustrated Monograph of the group, which I am now bringing to a completion, the following arrangement of the family into genera has been adopted;- |