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Show 718 , MR. F. O. PICKARD CAMBRIDGE ON [June 1 6 so common in the neighbourhood of Santarem, yet not once I detect a Spider in the act of seizing her prey or even venturing beyond the entrance of her burrow. I accentuate these deficiencies in our information, because one so often hears of a traveller neglecting to collect material, or make observations of habits, on the grounds that the " Authorities " at home nowadays know everything and that the trouble taken would be but labour lost. Among the more interesting incidental discoveries made during the work of classification, I. might mention that of the stridulatincr-organs found in three species of the subfamily Biplurinae. These- to which I have given the names lyra and pecten (the former referring to a row of chitinous keys on the inner side of the coxa of the pedipalp, the latter to a row of spines on the mandible)- are very similar to the musical boxes found in certain Oriental groups of Mygalomorphce by Mr. Pocock. Of what may be their real use, and of what their ultimate significance in systems of classification, it is perhaps a little too soon to speak. Before concluding these few remarks by way of preface to the more technical and less interesting descriptive matter, I would like to take the opportunity of giving my heart\r thanks to the many kind friends from whom I received both encouragement and actual assistance during our expedition up the Amazons. Had it not been for the courtesy of Mr. and Mrs. Alexander Siemens, I should probably not have visited Brazil at all. Nor must I forget to thank Mr. Brocklehurst, of Para, through whose kind introduction I fell into the hands of Mr. Wallace, an American gentleman resident in Santarem. For my fortnight's excursion in the forest I am entirely indebted to Mr. Wallace, who courteously placed his country residence at my disposal and gave me every assistance in his power to render my sojourn a complete success. To the many other friends whom I came across both afloat and ashore, too numerous to mention by name, I must give my thanks en masse. Bibliography relating to the Theraphosidae of South America. 1726. Madame MERIAN.-Insect. Surinam. 1746. KLEEMANN.-Kosel's Insects. 1758. LINNAEUS.-Syst. Nat. ed. 10. 1764. LINNAEUS.-Mus. Ludoviese Ulrica?. 1820. DUEOUR.-Ann. Sci. Phys. Nat. 1830-1844. M. PERTY.-Delectus Animalium Articul. quae in itinere per Brasiliam coll. J. B. de Spix et C. P. Ph. de Martius. 1831-1848. C. W . H A H N and C. L. KOCH.-Die Arachniden. Niirnberg. 1838. GUERIN.-Kev. Zool. p. 10. 1850-1862. H. LUCAS.-Expedition scientifique dans rAinerique du Sud Centrale, de Bio a Lima et de Lima a Para. |