from the Lower Amazons &c. 103 



1877. Acanthoctenus spi'nipes, Keys. 2, 14-3 mm. Verh. 

 z.-b. Ges. Wien, p. 695, t. ii. (viii.) fig. 61. Type in coll. 

 Brit. Mus. Nat. Hist. London. New Granada, Bogota. 



These two species belong to the subfam. Acanthocteninse 

 of Simon, in the family Zoropsida3, where I leave them for 

 the present in company with a new species — A. MarsMi — 

 described below, from the Amazons. Tliey are separated by 

 M. Simon from the other Ctenoid forms, on account of the 

 presence of the calamistrum and cribellum. (PI. IV. fig. iii. d.) 



Acanthoctenus Ridleyiy sp. n., ? . 



Hah. Pernambuco, Brazil. 



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



Total length (including mandibles) 14 mm. 



Colour. Carapace and legs mahogany-brown, the former 

 with two lateral dark serrate bands on each side of the 

 median line, the latter with indistinct annulations on the 

 tibiffi ; protarsi and tarsi darker. 



Structure. Similar in general character to the other forms 

 of the genus, resembling, however, A. spinipes, Keys., rather 

 than Marsha. Legs of first pair less than twice the total 

 length (in A. Marshii they are more than twice the total 

 length). Tibia i. with 7 pairs of spines beneath, ii. with 6-7 

 pairs beneath. Second row of eyes straight by anterior mar- 

 gins ; ocular quadrangle broader than long, much narrower 

 in front. Central posteriors large, less tlian lialf a diameter 

 apart. Central anteriors much smaller, half a diameter apart. 

 Clypeus equal to 1^ diameter of anterior central eye. 



Cribellum transverse, narrow, not divided into two trian- 

 gular disks. 



Vulva somewhat similar in general character to that of 

 Marsha^ but much less complicated. Central tongue dilate 

 in middle on either side, with narrow black chitinous margins, 

 anteriorly presenting on each side a spiraloid curving process, 

 beneath which lies the oviduct. 



This species was found among some spiders collected by 

 Mr. Ridley in the neighbourhood of Pernambuco. (PI. XV. 

 fig. iii. e.) 



Acanthoctenus Ilarshn*, sp. n., 2 . 



Hah. Santarem and Obidos. 



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



* It gives me much pleasure to connect this fine new species with the 

 name of Mr. Marsh, by whoae efforts our Amazonian collections, espe- 

 cially amongst the Lepldoptera, were considerably enriched 



