( ii wiiii ki.in r: imuoPODA of thi aubtralian region. 207 



AikiI tergite caudally rounded, slightly exceeded by the valves. 

 Gonopods of male with distal pari of mediae plate of usual Bublanoeolate 

 form though rather broader than usual, distally subacute, very narrowly 



rounded. The lelopodite Of the posterior gODOpods with the slender distal 



branches both surving in general mesad, but with the inner branch at tip 



curving Up B little more dorsad than the somewhat longer outer branch. 



Number of segments, forty-six. 



Length, near 'A7 mm.; width, to 4.5 mm. 



The species is apparently related to I), biincisus (Pocock) from New 

 Britain, but tbe latter is much larger, being 80 nun. Long with a width 

 of 7 nun., and differs in having the caudal border of segments light 

 banded; the posterior lateral region is also light. Its gonopods 

 unknown. 



592. DlNEMATOCRICUS DIDYMUS, sp. nOV. 



Type — M. C. Z. 4,940. Solomons: Tulagi (W. M. Mann). 



Sulcus of head continuous and well marked. Foveolae 2 + 2. 



Second tergite extending much below collum, the lower margin in side view 

 less angulate at middle than in D. patruelis. 



Suture of segments obscure or absent above as in the other species. Poste- 

 rior borders of some of the anterior segments also similarly strongly bisinuate, 

 incurving over the scobina. The latter very large, as in patruelis and appar- 

 ently biincisus (Pocock), and ceasing at or near the fourteenth segment as in 

 the former species. 



Anal tergite exceeded by the valves Median plate of male gonopods 

 strongly narrowed at base above which subelliptic with acute tip which is 

 nearly on a level with distal end of anterior gonopods. Branches of telopo- 

 dite similar to those of patruelis but much less strongly curved and the two 

 branches uniformly diverging distad, not first diverging and then again ap- 

 proaching each other. 



Number of segments, forty-two. 



Exceedingly close to D. patruelis. It differs strikingly in color, 

 being, instead of uniform black, brown with a narrow dark annulus 

 along the caudal border of each segment. Anal tergite blackish as 

 are also the valves dorsoanteriorly. Legs also brown instead of 

 ferruginous. 



593. DlNEMATOCRICUS MANEUS, Sp. nOV. 



Type.— M. C. Z. 4,927. Paratypes.— M. C. Z. 4,928. Solo- 

 mons: Wainoni Bay (W. M. Mann). 



