518 Mr. R. I. Pocock on new Species of 



upper keels of segments 2 to 4 strongly - 

 denticulate ; hand strongly crested, as 

 wide as bracbium ; pectinal teeth 15) . . forcipula, Gerv. 

 b^. Vesicle narrower, its width not greater 

 than that of the hand and ahout equal 

 to that of the brachiuni ; spine further 

 removed from base of aculeus. 

 d^. Tail thicker, width of the fourth 

 segment more than half its length, its 

 superior intercarinal space greater 

 than the width of the brachium. 

 a*. Hand weakly keeled, broader, dis- 

 tinctly broader than the brachium ; 

 tail comparatively smooth, tho 

 granulation evanescent ; stouter, 

 the first segment nearly as broad as 

 long. 

 a\ Tail thicker ; width of fifth seg- 

 ment about two thirds of its 



length pachyurtts, sp. n. 



ft'. Tail narrower ; width of fifth seg- 

 ment only about half its length. metuenduSy sp. n. 

 6*. Hand more strongly keeled, but 

 narrower, only very slightly wider 

 than the brachium ; tail very 

 coarsely and distinctly granular at 

 the sides and below ; first segment 

 considerably longer than broad. . . . dasyunts, sp. n. 

 b^. Tail thinner ; fourth segment about 

 twice as long as broad, its superior 

 intercarinal space (inside measure- 

 ments) narrower than brachium ; 

 caudal segments less coarsely gran- 

 ular than in 6* Cambridgei, sp. u. 



h. The inferior keels of segments 3 and 4 or 2, 3, 



and 4 united posteriorly or throughout their 



length. 



a". A single median keel on segments 2-4 ; 



abdominal sterna and intercarinal areas of 



tail smooth ; upper caudal crests strongly 



denticulate discrejyans, Karsch. 



6', A single median keel at most on the poste- 

 terior half of the second caudal segment 

 as well as on tho third and fourth ; abdo- 

 minal sterna and intercarinal spaces of 

 tail thickly granular. 

 a'. A median keel on the posterior third of 

 the second caudal segment and poste- 

 rior two thirds of tho third and almost 



the whole of the fourth androcottoides, Karsch. 



b''. The two paired keels on the lower side 

 of second caudal segment not united, 

 but united on the posterior half of the 

 third and the posterior two thirds of 

 the fourth trinitatit, sp. n. 



To judge from the single immature female specimen of 



