new Tropical and Southern Opilioiies. 441 



of the small lateral branches seen in Tricenonyx or Acu- 

 montia would lead to the one claw of the Plagiostethi, 

 vvjiereas the suppression of the median branch and the ex- 

 tension of the median cleft to the base of the claw in Soren- 

 senella would yield the two-clawed condition seen in the 

 Mecostethi. 



Genus AcuMONTiA, Loman. 



In tlie Proc. Zool. Soc. ii. pp. 405-409, for 1902, 1 described 

 two new species and one new subspecies of this Mascarene 

 genus, basing them for the most part upon a few rather 

 badly preserved specimens recently received from Dr. Forsyth 

 Major. "What were presumed to be the males and females of 

 the two species were described, and attention was drawn to a 

 peculiarity in the structure of the protarsus of the first leg of 

 the supposed female specimens. Additional and better- 

 preserved material received during the passage of that paper 

 through the press has convinced me that I fell into error in 

 the following particulars : — Firstly, the distal emargination 

 of the first protarsus is not a female, but a male character 

 of some species, e. g. A. H/oJori, though not found in the 

 males of A. rostrata; its absence in the male of A, 7'ostrata 

 and its presence in what were regarded as the females of this 

 species were the causes of tlie errors in sexual determination 

 that I made : secondly, the specimen described as the female 

 of A. rostrata is the male of another species : thirdly, the 

 specimens described as A, Majori probably represent the 

 sexes of two distinct species : fourthly, the specimens described 

 as A. rostrata subsp. Cowani are males and females of a 

 form which must be regarded as a valid species. 



Acumontia rostrata^ Poc. (PI. XI. figs. 2, 2 a.) 



Acumontia rostrata, Poc. P. Z. S. 1902, ii. p. 405, c? nee 5 > text-fig. 

 82 A nee B. 



The female of this very distinct species is unfortunately 

 unknown. The penis of the male terminates in a tridentate 

 glans retractile between an upper and a lower valve ; the 

 upper is double, being mesially cleft to its base, the lower is 

 strongly curved and furnished beneath on each side with two 

 strong setse. 



Acumontia echinafa, sp. n. 

 Acumontia rostrata, Poe. P. Z. S. 1902, ii. p. 407, $, text-fig. 82 B. 



cJ . — Dorsal scute more closely granular than in A. ros- 

 trata ] ocular tubercle not tubercularly spinous, but coarsely 



