1899.] AXD Si'IDEBS FilOM TROPICAL WEST AFEICA. "573 



and a little more than of 2nd ; protarsi of 1st and 2Qd legs with- 

 out inferior apical spine; tibia of 1st lightly scopulate. 



Vulva consisting of a median red sclerite, shaped like the ace of 

 spades, as broad as long, its anterior border with a median for- 

 wardly directed prominence and convex sides ; the lateral tooth 

 less prominent than in 0. scopulatus. 



d" . Similar in colour to 5 ? legs much longer (cf. measurements). 

 Legs not fringed as in 0. burtoni and C. capulinus ; tibial spur of 

 palpus long, viewed from above divei'ging externally, then turned 

 forwards at apex ; seen from the outside aspect, the upper edge 

 is nearly straight, the lower concave, with the apex strongly 

 bifurcate, the upper branch of the fork slightly hooked apically, 

 the lower truncate with acute inferior angle ; tarsus with only a 

 small tuberculiform prominence at base on outer side. 



Measurements in milUmetres. — 2 • Total length 26 ; length of 

 carapace 12, of 1st leg 44, 2nd 40, 3rd 34, 4th 47-5. 



c?. Total length 20; length of carapace 11, of 1st leg 57, 

 2nd 50, 3rd 41, 4th 57. 



Loc. Benito River (G. L. Bates). 



Otenus (Leptoctenus) agilior, sp. n. (Plate LV. fig. 7.) 



S . Colour. Carapace with pale median band constricted just 

 behind the head, laterally infuscate, paler above the border, area 

 around eyes black ; mandibles pale, infuscate externally ; palpi 

 and legs pale, obscurely banded with greyish black ; upperside of 

 abdomen clothed with olive-yellow hairs, and diversified with red 

 and black marking ; underside flavous. 



Carapace with a deep depression behind the head ; head and 

 posterior portion elevated ; clypeus narrower than anterior median 

 eyes. 



Legs very long and slender ; tarsal and protarsal scopulse very 

 scanty ; tibia of 1st armed with 4 anterior and 4 posterior spines 

 and with 6 pairs of inferior spines ; protarsus of 1st with 3 paii's 

 of inferior spines, and with 1 anterior and 3 posterior spines ; 

 patellae spined in front and behind. 



Palp with tibia longer than patella, and furnished externally 

 with a large bifid prominence, of which the upper branch is longer 

 and sharper than the lower ; base of tarsus above furnished with 

 a conical process ; tip of tarsus prolonged and subcylindrical ; 

 tarsus not so long as patella and tibia taken together (for struc- 

 tural details of tarsus see PI. LV. fig. 7). 



Measurements in millimetres. — Total length 10 ; length of cara- 

 pace 5, of palpus 9, of 1st leg 33, 2nd 29, 3rd 24. 4th 37 ; tibia of 

 1st 10, of 4th 9. 



Loc. Benito River {G. L. Bates). A single adult S example. 



M. Simon has recently described two species of Gtenus (^Lepto- 

 ctenv,s) from West Africa, namely C. (L.) lycosinus and C. (L.) 

 aculeatus, both from the Rio Pungo (Ann. Soc. Ent. France, 1897, 

 pp. 493-4). Both are based upon females, and are not comparable 

 with the male described above From C. (Z.) modesties {id. loc. 



