AETHEOPOD FATTNA OF THE WEST INDIES. 897 



having tlie anterior border of the carapace lightly emarginate 

 and only two lateral eyes on each side of it. 

 Type 0. Purvesii, Becker. 



20. * OiCLUs Purvesii {BecTcer). 



Diplocentrus Purvesii, Becher, Ann. Soc. Ent. Belg. xxiv. p. 142, pi. iii. 

 fig. 2 (1880). 



Oiclus Purvesii, Simon, Ann. Soc. Ent. Fr. (5) x. pp. 397-398 (1880). 



" Carapace elongate, granular on each side of the middle line 

 and posteriorly at the sides. 



" Tergites with three rows of tubercles, the posterior row 

 along the hinder border. 



" Tail four times as long as the carapace, with granular keels ; 

 vesicle elongate. 



" Hands short, robust, granular above. 



*' Pectines with 7 teeth." 



Locality. " Antigua." 



Grenus Opistha-Canthus, Peters, Mon. Ah. Wiss. Berlin, 1861, 

 p. 511 ; Ihorell, Etudes Scorpiol. p. 10. 



Carapace deeply excised anteriorly, longitudinally sulcate 

 throughout. Ocular tubercle near the middle. Three lateral 

 eyes on each side. 



Tail compressed, and rather short ; vesicle without spine 

 beneath the aculeus, which is short. 



CJielicerce with superior terminal fang subequal to the 

 inferior. 



Palpi large, denticles of the digits almost as in Diplocentrus ; 

 the upper surface of the hand divided by a strong keel into two 

 areas, the external of which is nearly vertical and meets the 

 internal horizontal area at an obtuse or right angle, the vertical 

 area separated by a strong keel from the "hand-back," which 

 constitutes the external area of the lower surface of the hand. 



Terminal tarsal segment of the legs furnished beneath with 

 two rows of spines. 



Sternum pentagonal, as wide as long, parallel-sided. 



Genital operculum cleft in the male, its halves united in 

 female. 



Pectines short, the shaft very broad at the base owing to the 

 width of the basal intermediate lamella. 



Stigmata elongate. 



Type, O. elatus, Grervais. 



31* 



