chamberlin: mybxofoda of the Australian region. 203 



This species is like D, sericoides and amphelicfogon in having the 

 segments with a silky lustre due to densely arranged fine longitudinal 

 Btriae, the striae in the present form being exceedingly fine. From 

 these species and D. holosericeus it is readily distinguished not only 



by the structure of the gonopods bu1 also in having the caudal margin 

 of sonu 1 of the anterior segments sinuate over the scohina as in rex 

 and iniduhiius. In the gonopods the median plate has the distal 

 process longer and narrower than in others of the group with silky 

 lustre mentioned above, and it is acutely pointed distad. The telo- 

 podite of the posterior pair has both branches straight, the inner one 

 extending beyond the middle of the outer. 



586. DlNEMATOCRICUS MANNI, sp. nOV. 



Type.— M. C. Z. 4,750. Paratype.— M. C. Z. 4,751. Fijis: 

 Wainunu (W. M. Mann). 



The general color is somewhat olive-brown with the legs ferruginous, 

 sometimes more greenish with the posterior borders of segments brown. 

 Head darker, black or somewhat olive, paler in a median stripe that widens 

 ventrad. 



Sulcus of head discontinuous in the frontal region. Surface with deep 

 impressed lines above arranged coriariously. Foveolae 2 + 2. 



Collum only a little exceeded by the second tergite. Lower margin widely 

 rounded, margined as usual. Surface with fine coriarious markings. 



Surface of other segments with impressed lines very fine, not deep, short, 

 anastomosing but chiefly longitudinal, most distinct on posterior part of ring. 

 Longitudinal striae below and on sides well separated, some occurring also 

 above the pore, these more oblique. Suture absent dorsally. The bisinua- 

 tion of part of the segments so deep that the scobina are in part uncovered. 

 Scobina occurring only to the twenty second segment inclusive. 



Surface of anal segment appearing smooth and shining; under the lens 

 showing coriarious markings. Valves exceeding the scutum; but little com- 

 pressed, the margins not set off. 



Number of segments, fifty-six. 



Length (female), near 52 mm.; width, 5.6 mm. 



This species is one of several occurring in the Fijis which have the 

 posterior borders of some of the anterior segments bisinuate, an incurv- 

 ing or emargination occurring on each side over the corresponding 

 scobina of the succeeding segment. The emarginations in the present 

 species are particularly strong. 



