Mr. A. G-. Butler on the Oenus Thelyphonus. 201 



Fam. Tliel3rphonid8B, Wood. 

 Genus Thelyphonus, Latreille. 



Section a. Species with Jive sjnnes on upperside of second 

 joint of cheliceres. 



1. Thelyphonus giganteus. 



Thelyphonus r/iqanteus, Lucas, Monogr. in Gu^rin's Mag. de Zool. pi. 8 

 (1835) ; Kbch, Arachn. x. p. 21, pis. 331, 332, figs. 767, 768 (1843). 



Thehjphomis exciihitor, Girard, Marcy's Report of Expl. of Red River, 

 p. 265, fig. xvii. 1-4. 



Hah. Mexico {Oaxaca). Obtained 1858, from M. Salld. 

 B.M. 



2. Thelyphonus mextcanus, n. sp. PL XIII. fig. 1. 



Colour chocolate-brown. 



Allied to T. giganteus, one third smaller; cephalothorax 

 narrower, more pointed in front and less rugose ; abdomen 

 with the sides much more parallel ; the stigmatiform spots 

 much better defined ; the granular rugosities less distinct ; che- 

 liceres, excepting the second joint, more rugose and pilose, the 

 latter joint broader ; the teeth above quite diiferent in aiTange- 

 ment, five in number, the first two and the fifth very short and 

 blunt, the fourth slightly longer, the third twice the length of 

 the fourth ; a space between the second and third ; third joint 

 with external rugosities lengthened, rendering it distinctly 

 spinous ; fourth joint more pilose ; legs less rugose, more 

 pilose. 



Length of cephalothorax and abdomen 1 inch 9| lines. 



Hab. Mexico. B.M. 



3. Thelyp)honus hrasilianus. 

 Thelyphonus hrasilianus, Koch, Arachn. x. p. 24, pi. 333. fig. 770 (1843). 

 Hab. Brazil. B.M. 



4. Thelyphonus amazonicus, n. sp. PI. XIII. fig. 2. 



Seems allied to T. spinimanus and T. antilla7ius, but may 

 be at once distinguished from both by its more cylindrical 

 abdomen, which has no marginal ridge as in those species. 



Colours : cephalothorax above black, somewhat shining ; 

 abdomen dull black ; cheliceres shining, pitchy, last joint 

 reddish ; legs and caudal appendage reddish, varied with 

 greyish black ; entire central region below shining red, 



Cephalothorax very slightly rugose, oblong, triangular in 

 front ; abdomen half as long again, subcylindrical ; stigmati- 

 form depressions ill-defined ; tail setose throughout its entire 



Ann. (& Mag. N. Hist. Ser. 4. Vol. x. 16 



