I 



from the Loioer Amazons &c. 99 



Tot. len. 30 mm., carap. 13*5; legs i. 75, iv. 76; pat.+ 

 tib. i. 23-5, iv. 22. 



This huge form, the full expanse of whose legs extends 

 over 5^ inches (149 mm.), while that of hrunneus is only 4 

 inches (118 mm,), is identical with the latter in general cha- 

 racters, but presents decided differences on close comparison 

 with it, irrespective of absolute size. Pat. and tib. i. are in 

 gigas longer than the same segments in iv., while in hrunneus 

 the first two are shorter than those of iv. 



The palpal " unca," though longer and somewhat more 

 slender, is much stouter and more abruptly hooked at its 

 extremity, while the dorsal angle is more prominent and 

 different in form (PI. IV. fig. i. c, 1). 



A single specimen in the Museum collection from Brazil, 

 probably from the Upper Amazons. 



Lycoctenus demerarensis^ sp. n., 6 



Hah. Demerara. 



Type in coll. Brit. Mus. Nat. Hist. London. 



Tot. len. 22 mm., carap. 11; legs i. 54, iv. 57; pat. + 

 tib. i. 17, iv. 16 ; tib. i. 10-75, iv. 11-25. 



Abdomen unicolorous above, dull russet below. A form 

 closely allied to colomhianus, which may ultimately prove to be 

 identical with it. Pat. and tib. iv. are unequal in the present 

 form, equal in colomhianus^ while the palpal " unca " presents 

 differences sufficient, in consideration of the difference of 

 locality, to warrant the formation of a distinct subspecies for 

 both forms, until further material enables one to decide more 

 positively on the point. 



It can readily be distinguished from gigas and hrunneus 

 by the absence of spots on the abdomen and from the fact 

 that the carapace equals tibia iv. in length. The " unca " of 

 the palpal organs is, moreover, more slender and does not 

 present so decided and prominent a dorsal angle as in these two 

 latter forms (PI. IV. fig. i. c, 3). 



A single male from Demerara, taken by Mr. W. L. Sclater. 



Lycoctenus colomhianus, sp. n., 6 . 



Hah. Colombia, S. America. 



Type in coll. Brit. Mus. Nat. Hist. London. 



Tot. len. 18 mm., carap. 9-5; legs i. 39, iv. 46; pat.+ 

 tib. i. 13-5, iv. 13-5 ; tib. i. 9, iv. 9-5. 



Abdomen unicolorous above, ferruginous below. This 

 form resembles demerarensis in general characters, but differs 



7* 



