On a new Theraphosicl Spider from South America. 347 



specific diversity, and at the same time to draw attention to 

 the interesting- probable fact of yet another Perciform (ish 

 being common to tlie coasts of Eastern Australia and Cliih", 

 like Gilhertia semicincta and Gaprodon lon^jimanunj which 

 were likewise obtained by both the 'Tlietis' and the Plate 

 expeditions. 



At any rate, should, on direct comparison, the New South 

 Wales and Juan Fernandez specimens prove to be specifi- 

 cally distinct, which I doubt, these species would be more 

 nearly related to each other than to C. Allporti. 



It is much to be desired that in future a closer comparison 

 be instituted between the fishes of the western and eastern 

 parts of the South Pacific than has hitherto been the case. 



XLIX. — ^4 neio Stridulating Theraphosid Spider from South 

 America. By R. I. POCOCK. 



Up to the present time, with the exception of the Trinidad 

 Psalmopoeus Camhridgii, the stridulating Theraphosid Spiders 

 have been recorded only from tropical Africa and the Oriental 

 Region. The species that I here record therefore is of 

 considerable interest, as being a genuine South-American 

 Theraphosid with a stridulating-organ lodged between the 

 coxas of the palp and of the fiist pair of legs. In position, 

 but not in structure, this organ resembles that of the tropical 

 African genera of Eumenophorina) {Phoneijusa, Hi/stero- 

 crates, &c.). The organ, however, is much less specialized 

 than in these last and has not the same taxonomic importance, 

 being apparently only of generic value. 



CiTHAEOSCELUS, gen. nov. 



Belonging to Simon's section Homceomraatefe of the sub- 

 family Theraphosinse (Aviculariinae), and allied both to 

 IJomwomma and Phryxotrichus in size and spacing of the 

 eyes, differing from the latter in having the labium distally 

 covered with close-set spinules, and from both in possessiuo" 

 a stridulating-organ lodged between the coxa of the palp and 

 that of the first leg. This organ consists of an irregular 

 cluster of about a dozen or more longer and shorter red, 

 pubescent, incrassate but apically pointed, nearly horizontal 

 bristles above the suture on the coxa of the first leg, and a 

 few similar but smaller bristles below the suture. On the 

 posterior side of the coxa of the palp there are about nine 

 similar bristles. 



