1S09.] Ayi) Si'IDERS FROM TKOl'ICAL WEST AFRICA. "^73 



and a little more than of 2nd ; pvotarsi 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 C. scopitlatas. 



(S . Similar in colour to $ , legs much longer (cf. measurements). 

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

 palpus long, viewed from above diverging 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 mUlinietres. — J . Total length 26 ; length of 

 carapace 12, of 1st leg 41, 2nd 40, 3rd 34, 4th 47-5. 



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

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



Loc. Benito Eiver {G. L. Bates). 



Ctenus (Lbptoctbnus) 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 ; tai'sal and protarsal scopulee 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 pairs 

 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 fm-nished Avith 

 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 Ctenus (Lepto- 

 cteni(s) from West Africa, namely C. (L.) hjcosinus and C. (L.) 

 aculeatus, both from the Eio 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. (L.) modestus {id. loc. 



