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Show 762 MR. F. O. PICKARD CAMBRIDGE ON [JllUe 16 In Ann. Mag. Nat. Hist. ser. 6, vol. xvi. p. 224, 1895, Mr. B. Pocock has already pointed out that the type specimen of Ischnothele caudata, Auss., is congeneric with examples of a Spider which have been identified by M . Simon as Mygale guyanensis, Walck., from the island of St. Vincent, West Indies, these being also in the British Museum of Natural History, South Kensington. M . Simon has, however (Hist. Nat. Ar. 1892, i. p. 187), referred M. guyanensis to Karsch's genus Thelechorls, created in 1881 for a Spider found in Madagascar, as though congeneric with it and with T. strlatlpes, Sim., also from Madagascar. The latter, M . Simon, on the authority of Dr. Lenz of Liibeck, now regards as identical with Karsch's species T. rutenbergl, the type of Thelechorls. Whether this form is really congeneric wdth M. guyanensis, and therefore with /. caudata, Auss., the type of Ausserer's genus Ischnothele created in 1875,1 am not, of course, in a position to decide. But even if it were, the generic name Ischnothele has priority over Thelechorls, as Mr. Pocock has already remarked. Whether, too, the form regarded as M. guyanensis, Walck., by M . Simon is really the form which Walckenaer had before him, I am, of course, unable to say ; but from the fact that the former is abundant in Guyana, the isle of St. Vincent, and in North Brazil (sec. Simon), one would regard it as highly probable, though not absolutely certain on this account. In any case, unless M . Simon has seen the types, such an identification must be regarded not as Ischnothele guyanensis (Walck.) but as Ischnothele guyanensis (Walck.)-(Sim.), the brackets signifying that, tbe form was described or referred to by these authors under some generic name other than Ischnothele, while the " - (Sim.) " indicates that the form is not necessarily in reality Wak-kenaer's form but M . Simon's identification of it. It may be convenient enough to regard the "first identification by an author of a form of which the type no longer exists, and the description and figure do not furnish conclusive evidence as to its identity, as correct. Such an identification, however, even though universallv adopted for the sake of convenience, is not, on this account alone, of necessity the right one. ISCHNOTHELE SIEMENSI, n. sp. (Plate XXXV. figs. 7, 9,15.) 2 . 18 m m . long. Type in coll. Brit. Mus. Nat. Hist. 1896. Hab. Lower Amazons, everywhere, from Para-Manaos. 2 •-Colour. Carapace testaceous brown, broadly margined with pale rufous-yellow hairs ; mandibles black-brown. Abdomen black or deep brown, with a central dorsal longitudinal rufous silver-white band on the posterior three-quarters; broad in front, narrowed behind, with four and often five short oblique branches; spinners brown; ventral surface pale brown. Sternum, coxa, and trochanter of legs and pedipalp testaceous brown ; the coxa of latter margined anteriorly with yellow. Femora and patella of legs dusky black; tibia, protarsus, and tarsus dull orange-brown. Carapace compressed. Cephalic area slightly raised. Eye- |