391 MB. E. I. POCOCK OS THE 



Genital operculum cleft in the male, its halves united in the 

 female. 



Pectinen of normal construction. 

 Stigmata elongate. 



17. *DiPL0CENTiiU3 Gr\]-SDJjkCRU, KarscTi, Zeits. Naturwissen. 

 (3) V. pp. 407-408 (18S0). 



This species has been very briefly described. 



The Tipper surface of the trunk is entirely smooth. The 

 dorsal surface of the hand is evenly arched, and nearly smooth. 

 The first four segments of the tail have 10 complete keels, 



Pectinal teeth 6-8. 



Length 30-32 millim. 



Locality. Trinidad and Cuba. 



18. DiPLOCENTEUS ANTILLAlSmS, sp. n. (PL XXIX. figs. Q-Qa.) 

 § . Colour fusco-castaneous above : legs and vesicle ferru- 

 ginous, lower surface of trunk ochraceous ; rarely (in smaller 

 specimens) the upper surface is paler and obscurely variegated 

 with fuscous. Smooth and polished. 



Carapace smooth, very finely and closely punctulate, at most 

 obsoletely granular at the sides ; the tubercle small, uudivided, 

 the area in front and behind it deeply sulcate longitudinally ; the 

 auterior border deeply emarginate in the middle, the frontal 

 lobes rounded. 



Tergites smooth, finely punctulate, minutely granular only 

 posteriorly ; the last, however, more coarsely granular at the 

 sides, some of the granules on each side arranged in two series, 

 so that the tergite may be said to be furnished with four keels. 



Sternites smooth, finely punctulate, and studded with a few 

 larger punctures, two of which are symmetrically placed near the 

 middle on each side of the central line ; a distinct longitudinal 

 depression on the inner side of each of the stigmata ; the last 

 sternite more distinctly punctulate and obsoletely quadricostate 

 posteriorly. 



Tail about four times the length of the carapace, which is a 

 little shorter than the first two segments, tolerably deeply and 

 widely excavated above, finely punctulate ; the keels all well- 

 developed but not granular, at most crenulate, but impressed 

 with setiferous pores which give them a roughened appearance ; 

 the first and second segments furnished with 10 keels ; the 

 median lateral keel, however, of the second weaker than the 



