100 Mr. F. 0. P. Cambridge on Cteniform Spiders 



from it in the form of the palpal "unca," its smaller size, and 

 in the relative lengths of pat. and tib. i. and iv. From gigas 

 and hrunneus it may be known by the concolorous abdomen 

 (PI. IV. fig. i. 4). 



A single dried specimen of the male in the Museum collec- 

 tion from Colombia, South America. 



Lycoctenus HewHsoni, sp. n.*, ^ ? . 



Hah. Largo, near Santai*em. 



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



$ (immature). Length (including mandibles) 25 mm., 

 6 20 mm. 



Colour. — 2 . The whole spider entirely dull yellow-brown, 

 carapace and abdomen towards apex darker ; the former 

 exhibits an indistinct broad central and marginal pale bands. 

 Legs variegated with numerous spots and lines of white 

 pubescence. 



6 . Similar to the female ; carapace paler, with two dark 

 bands between the three ])ale bands much more distinctly 

 marked. Abdomen with shoulders darker and two dark 

 central, dorsal, parallel lines on the basal half, continued as a 

 single line to the spinners. Legs pale yellow ; libia, pro- 

 tarsi, and tarsi sooty, clothed with white and grey pubes- 

 cence, especially conspicuous on the protarsi. 



Ocular area and clypeus spotted with white pubescence. 

 Mandibles with a conspicuous basal spot of white on upper- 

 side. 



Carapace with fine central stria, gibbous posteriorly, and 

 abruptly inclined to the pedicle. Dorsal profile slightly 

 concave. Eyes as in " brunyieus,^^ laterals not on tubercle. 

 Fang-groove with 3 denticles on both margins. Armature of 

 legs similar to that of '' hrunneus.''^ Tarsal claws 3 ; superiors 

 •with 6 long broad denticules beneath, graduated towards 

 base. No claw-tuft. 



5 juv. Similar to the male, but margins of fang-groove 

 •with four denticules on each. 



Measurements in millim. — Tot. len. 18, carap. 9'5 ; tib. i. 

 9-5, iv. 9-5; pat. + tib. i. 12-5, iv. 12-5; legs i. 38, iv. 43. 



Very abundant on grass and rushes in the Largo at the 

 mouth of the Tapajos, opposite Santarcm, L'he females were 

 unfortunately all immature, though I liad the luck to secure 

 one adult male. The spiders rested on the grass with legs 



* In memory of a deli^rhtful expedition in compauy with Mr. Ilewitson 

 to the haunts of the " Victoria reffia," when numerous arachnological 

 treasures were added to our collection. 



