102 Mr. F. O. P. Cambridge on Cteniform Spiders 



namely A. spimfjer^ Keys. ; tliis, liowever, is not the name 

 given by Keyserling, which is spinigerus. 



I have been able to add a fine species to the genus in 

 addition to the two, spinigerus and spinipes, described by 

 Keyserling, of which the types are now before me, and 

 another has come to hand from tiie collection of Mr. Ridley, 

 in the possession of the Natural History Museum, South 

 Kensington, taken near Pernambuco, to which I have given 

 the name RidleyL 



Table of Species. 



Males. 



a. Size much larger, 17 mm. Tibia of pedipalp 



much produced beneath, on outer side at apex ; 

 forming a dilatation whose apex is furnished 

 with a short, sharp, black hook. Apex of bulb 

 beariug a tine, curving-, spiraloid spine, spring- 

 ing from a membranous tissue A. Marshii, sp. n. 



b. Size much smaller, 12'5 mm. Tibia of pedipalp 



not so much produced ; outer side slightly 

 dilate at apex and terminating in a .-lihort, 

 broad, chitinous spur. Apex of bulb bearing no 

 spiraloid spine A. spiniyeriu, Keya. 



Females. 



a. Size much larger, 20 mm. Vulva presenting a 

 transverse oval depression, with central poste- 

 rior triangular tongue, whose anterior margins 

 are continued on either side in the form of a 

 coiled spiraloid oviduct A. Marshii, sp. n. 



h. Size much smaller, 14'3 mm. 



1. Vulva presenting anteriorly a large quadrate 



spade-like depression, concave within towards 

 apex, which is bilobate. Produced poste- 

 riorly into a stem, dilate towards posterior 

 margin, flanked on both sides by a horseshoe- 

 shaped tuberculiform prominence, procurved, 

 whose arms (transversely corrugate) termi- 

 nate with a small shining boss. Cribellum 

 divided in centre into two distinct triangular 

 areas A. spinipes, Keys. 



2. Vulva presenting anteriorly on each side a 



spiraloid cui-ving process. Central tongue 

 dilate in centre on each side, with narrow 

 black chitinous margin, posteriorly narrowed. 

 Cribellum transverse oblong, not divided in 

 centre into two distinct areas A. Ridleyi, sp. n. 



1877. Acandwclenus sj)inigerus J K.eys. cr,12'5nini. Verb, 

 z.-b. Ges. Wien, p, G5)3, t. ii. (viii.) fig. 60. Alexico, 

 (Cordova. Type in coll. I^rit. Mas. Nat. Hist. London. 

 (PI. IV. fig. iii. b.) 



