722 till. r. O. PICKAKD CAMBEIDQB ON [Juiie 16, 



The division Ojpisihothelas is subdivided into two suborders similar 

 in their extent to those of M. Simon, for which Mr. Pocock has 

 selected the names MiigalomorphcB and Arachnomorjjlics. 



So recently as March 1, 1895, Dr. Thorell (' Descript. Catalogue 

 of the Spiders of Burma ') has selected two new names for two 

 similarly constituted suborders — Parallelodontes and Antiodontes, 

 referring of conrse to the articulation of the mandibles. These 

 two suborders are apparently equivalent to M. Simon's " Aranece 

 Theraphosce" and ^^Aranece Verce," and to Mr. Pocock's "Mygalo- 

 morphce " (excluding Liphistius) and " Arachtiomorphce." 



Wbich of these names are most suitable? One might suppose 

 that those which referred to some important character would be 

 the most convenient ; but such is not necessarily the case, since, 

 for instance, the division into Tetrapneumones and Bipnemnones 

 was entirely suitable until the discovery of " llypochilas," with four 

 lung-books, and the fact that " I/ops" bad no lung-books but four 

 tracheal stigmata ; so that, althougii Dr. Thorell's terms " Paral- 

 lelodontes" ajiA '■^ Antiodontes" avti suitable as referring to an im- 

 portant differential character of the two groups, yet these, too, 

 are liable to be laid aside, when perhaps some form is discovered 

 offering in itself characters proving it to belong to both suborders. 



As a matter of fact, the names which have less direct reference 

 to such characters are in reality after all more convenient, and 

 indeed suitable, and certainly a single name is more convenient 

 than a double one — " MygalomorpluB " than "Aranece Theraphosa;," 

 for instance. 



• For these reasons I have retained the terms " Mygalomorphm " 

 and " Arachnomorphce " in the present paper ; while I can see no 

 reason for substituting the new family name Aviculuriidte of 

 M. Simon for the older and quite as suitable name Theraphosidce 

 of Thorell, following Walckenaer. 



Family TnunAPiiosiDJE, Thorell. 



List of Genera, Species, and Subspecies from the Lower Amazons 

 from January to March, 1896 — including twelve genera, 

 fourteen species, and one subspecies : of these, four genera 

 are new, eleven are new species, one a new subspecies, and 

 one the male sex of which is new to science. 



Subfam. PAltATROPlDtN.E. 



Genua Paratropis, E. Sim. Species P. papilligera, n. sp., d ? ■ P- 723. 

 „ Anisaspaides, new. „ A. gigantea, n. sp., $, p. 726. 



,, ACTINOPODIN.E. 



Genus Actinapus, Perty. Species A. wallacei, n. ep., J , p. 728. 

 „ Ctenizim^. 



Genua Acanthodon,Gi\xknn. Species ^. saji^aremia, n. sp., J, p. 733. 



■■ „ BABYCIIElINiE. 



Genus Homxoplacis, E. Sim. Species H. austeni, n. sp., cJ, p. 735. 



„ AVICULAIHIN.E. 



Genus Acanthosciirria, Auss. Species A. genicnlata, 0. K., 5 , p. 737. 



„ „ A. brocklehuTSti, n. sp., 5> 



[p. 739. 



