762 MR. r. O. PICKAED CAMBRIDGE ON [Juue 16, 



In Ann. Mag. Nat. Hist. ser. 6, vol. xyi. p. 224, 1895, Mr. E. I. 

 Pocock has already pointed out that the type specimen of IseJino- 

 thele cauduta, Auss., is congeneric with examples of a Spider which 

 have hceii identified by M. Simon as Ali/gah gmjanensis, Walck., 

 from the island of St. Vincent, West Indies, these being also in 

 the British Museum of Natural Hisl^ory, South Kensington. 



M. Simon has, however (Hist. Nat. Ar. 1892, i. p. 187), referred 

 M. (juyanensis to Karsch's genus Thelechoris, created in 1881 for a 

 Spider found in Madagascar, as though congeneric with it and with 

 T. striatipes, 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. ruUnhergi, the type of Thelechoris. 



Whether this form is really congeneric with M. guyonensis, and 

 therefore with /. cauJata, Auss., the type of Ausserer's genus Iscli- 

 nnthele created in 1875, 1 am not, of course, in a position to decide. 

 But even if it were, the generic name IscJmolhde has priority over 

 Thelechoris, as Mr. Pocock has already remarked. 



Whether, too, the form regarded as M. giiyanensis, Walck., by 

 M. Simon is really the form which Walckenaer had before liim, 

 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 Isehnoihele guyanensis 

 (Walck.) but as Ischnothele guymiensis (Walck.) — (Sim.), the 

 brackets signifying that the 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 Walckenaer's form but M. Simon's identification of it. 



It may be convetiient 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 

 universally adopted for the sake of convenience, is not, on this 

 account alone, of necessity the right one. 



IsonNOTHELH siEMENSi, n. sp. (Plate XXXV. figs. 7, 9, 15.) 

 $.18 mm. long. Type in coll. Brit. Mus. Nat. Hist. 1896. 

 JJah. Lower Amazons, everywhere, from Pard — Manaos. 



$ . — Colour. Carapace testaceous bro\\'n, broadly margined with 

 pale rufous-yellow hairs ; mandibles black-brown. Ahdomen black 

 or deep brown, with a central dorsal longitudinal rnfous silver-white 

 band on the posterior three-quarters; broad in front, narrow-ed 

 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 Avith yellow. Femora and patella of legs duslsy black ; 

 tibia, protarsus, and tarsus dull orange-brown. 



Carapace compressed. Cephalic area slightly raised. Eye- 



