222 bulletin: museum of comparative zoology. 



Eyes subcircular, narrower in the antero-posterior direction than trans- 

 versely; separated by rather more than twice their diameter. Antennae 

 short. Setigerous foveolae 2 + 2. 



CoUum less strongly narrowed down the side than, e. g., in T. rubrocinctus, 

 the anterior side of the lower, narrower, part being convex while the corre- 

 sponding caudal side is concave, further dorsad becoming convex. 



Segmental sutures distinct throughout, not at all or scarcely wavy at level 

 of pore. Segments not at all constricted, prozonite and metazonite being at 

 the same level. Both prozonites and metazonites smooth. 



In the gonopods the median plate the proximal arms are widely divergent, 

 mesally nearly horizontal, curving more dorsad of ectal distally, each arm 

 extending out about the base of the gonopod to its ectal side; median division 

 short, distally rounded, curved forwards between the gonopods. 



Number of segments uncertain since the caudal end of the body is missing; 

 thirty segments are present. 



Diameter (male), 2.6 mm. 



638. Trigoniulus caeruleocinctus, sp. nov. 



Type.— M. C. Z. 4,779. Ternate (Thomas Barbour). 



The free part of prozonites are bluish, this color also extending a little 

 caudad of the segmental suture, the covered zone fulvous; remaining part of 

 metazonites ferruginous or somewhat reddish; in the caudal region an appear- 

 ance of darker spots along the pore-level. Legs hght ferruginous. Anal 

 segment dark. 



Antennae short. Eyes small, about two and a half times their diameter 

 apart. Setigerous foveolae as usual. 



CoUum narrowed down side a httle less than usual, the lower end well 

 rounded ventrally, the anterior margin convex, the posterior straight or for 

 a short distance slightly concave. 



Transverse sutures very distinct throughout; only slightly waved at level 

 of pore. Segments not constricted. Metazonites smooth; prozonites striate 

 laterally and beneath, above with some coarse puncta in front of the suture. 



Anal scutum about equalhng valves, rounded behind, smooth. Valves 

 smooth, not marginate. 



The median plate of the male gonopods resembles that of T. eurabdotus, the 

 arms extending out widely about the bases of the gonopods as in that species; 

 but the distal part is much shorter, distally truncate and not bent caudad at 

 tip; the coxal plates of the anterior gonopods shorter, not surpassing the 

 median plate, truncate across distal ends. 



Diameter (male), 2.5 mm. 



639. Trigoniulus rubrocinctus, sp. nov. 

 Type.— M. C. Z. 4,777. Amboina (Thomas Barbour). 



