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



alone of iv. Tarsi ill. and iv. with a double series of 6 

 small spines beneath, on either side of central longitudinal 

 band of setae. 



Vulva consisting of a broad, central, wedge-shaped chitinous 

 piece, convex in front, with three longitudinal indentations or 

 grooves, the central one the longest, having on. each side a 

 broad, semicircular, convex band of chitin. Palpal organs of 

 male with a central liook-like apophysis (the ''unca"), the 

 hook itself long and slightly curved. Tibia furnished with two 

 dark apophyses at apex, one beneath the other on outer side 

 (see figures). Fang-groove of mandibles with four teeth on 

 lower side, three towards base on upperside. 



Measurements in millim. — ^. Tot. len. 20, carap. 10; 

 legs i. 53, iv. 56 ; pat.-i-tib. i. 1.5'5, iv, 16*75 ; tib. i. 11, 

 iv. 12. 



$. Tot. len. 35, carap. 14; legs i. 50, iv. bQ; pat. -|- tib. 

 i. 17, iv. 17; tib. i. lO'o, iv. 11. 



Five females and one male of this fine species were taken 

 by myself in the forest near Santarem. They seem to lead a 

 vagabond life, appearing sometimes in the daytime, some- 

 times at niuht, but are probably chiefly nocturnal in their 

 habits. The male was taken after dark, with the aid of a 

 lantern, crossing a path in the forest, and one of the females 

 ascending a bank, having been disturbed by the scrimmage 

 made in an effort to secure a fine scorpion. (PL IV. figs. i. a, 

 c 2, d, and ii. a, c.) 



Li/cocteruis hogotcnsis (Keys.), ?. Verb. z.-b. Ges. VVien, 

 1877, p. 684. 



Tot. len. 27 mm., carap. 12-7; legs i. 38'5, iv. 46; pat.-|- 

 tib. i. 15, iv. 15-4; tib. i. 92, iv. 10 (sec. Keyserling). 



This species, of which the types are before me, is readily 

 distinguishable by tlie form of the vulva from brunneus, 

 though at first sight they appear identical. Tlie central 

 tongue of the vulva has a high carina in the centre, al)ruptly 

 lowered posteriorly, seen in profile. Tliis central tongue in 

 brunneus has a central channel between two low carinaj, 

 which sink gradually behind. In bogotensis the central 

 tongue is squarely truncate and broader anteriorly, con- 

 verging to a sharj) ])oint j)osteriorly ; in brunneus it is nar- 

 rower and rounded anteriorly, bluffiy rounded behind, though 

 attenuate (PI. IV. fig. ii. b, d). 



Lycoctenus gigas, sp. n., ^ . 



Jlab. Uncertain, probably Upper Amazons. 

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



