192 bulletin: museum of comparative zoology. 



cast, these tergites being bordered posteriorly with dark. The other seg- 

 ments below the level of the pores also light olive with posterior border dark 

 like dorsum but of a somewhat more brownish cast. Legs dense shining brown. 

 Anal scutum blaclcish, uniform; valves similar but in the middle region dark 

 olivaceous. 



Sulcus of head complete. Below level of antennae on each side a series of 

 oblique striae, the striae of upper region fewer and much weaker. Surface 

 in general shining. 



CoUum of usual form, much exceeded below by the second tergite which is 

 not excavated. The plate is margined only below, the margining sulcus not 

 at all extending about the anterior corner. Surface very finely punctate 

 among the coriarious markings. 



Fourth, fifth, and sixth plates with two transverse sulci; on the following 

 segments only the usual transverse sulcus, this lying in a shallow transverse 

 depression or weak constriction and distinct across the dorsum throughout. 

 Surface of second plate similar to that of collum but in following plates the 

 striae become more and more restricted to a longitudinal direction, soon 

 forming a dense series giving the characteristic silky lustre as in D. sericoides 

 and related forms. Scobina from eighth segment to the thirty ninth or 

 fortieth; each a deep lunate impression within some finer lines in front of this. 



Angle of anal scutum very obtuse, rounded. Surface densely finely punc- 

 tate, not striate, shining; from each lateral margin behind a series of furrows 

 running mesad. Valves compressed; surface densely finely punctate, shining. 



Number of segments, fifty-five to fifty-eight. 



Length (male), near 105 mm.; width, 11 mm. 



This species may be distinguished from the related Fijian forms 

 having a similar characteristic silky lustre by the different form of the 

 male gonopods. The telopodite of the posterior pair has the inner 

 branch slender and finely pointed as in these other species, the tip not 

 extending beyond the middle of the length of the outer branch; the 

 latter is characterized by being bent or coiled into two complete 

 circles, one lying within or immediately over the other. 



572. Dinematocricus sericoides, sp. nov. 



Type.— M. C. Z. 4,710. Paratypes.— M. C. Z. 4,711. Fijis: 

 Suva (A. G. Mayer). 



General color fuscous to olive-black, the covered part of prozonites com- 

 monly in some degree lighter; below level of pores there is typically a dull 

 ferruginous to a somewhat light olive-brown stripe over the caudal border. 

 Legs fuscous to ferruginous. Anal scutum and valves olive-black without 

 lighter markings. 



