18 bulletin: museum of comparative zoology. 



side being much smaller and the third tooth being also partly divided ; 

 the caudal limiting sulcus of the dental plates forming an obtuse angle 

 at the middle, sending off a small branch on each side in a caudoectal 

 direction; dental plate broader than long. Ventral plates without 

 sulci excepting the short traces across anterior border. Last ventral 

 plate with sides convex, narrowing strongly caudad from near the 

 anterior third, caudal margin incurved. Pseudopleural process 

 exceeding ventral plate by more than its length, distally somewhat 

 bluntly rounded; with three apical spines, and one on lateral and 

 one on dorsal margin; pores small and very numerous, the porigerous 

 area much broader than the non-porigerous. Legs from the first to 

 the sixteenth inclusive with two tarsal spines; twentieth legs each with 

 a tarsal spine. Anal legs missing. 



Length, 45 mm. 



Very similar to R. longicornis Pocock; but distinguished from that 

 form in having the sulci and margination of tergites begin farther 

 forward. 



38. Rhysida suvana, sp. nov. 



Ti-PE.— M. C. Z. 2,026. Paratypes.— M. C. Z. 2,027. Fijis: 

 Suva (W. M. Mann). 



Head sparsely punctate, the puncta nearly absent from the most 

 anterior region. Antennae composed of twenty articles, reaching to 

 segment five. Tergites bisulcate from the fifth caudad; margined 

 from the eighth caudad. Prosternal teeth 3 + 3 but the two inner- 

 most on each side almost completely fused, being separated only by a 

 slight distal notch, rounded; caudal limiting sulcus bent forward at 

 middle into an acute angle, the principal part of sulcus forming a very 

 slightly obtuse angle when projected; dental plates broader than long. 

 Anterior ventral plates with the usual sulci only across anterior border; 

 but others with the sulci extending back to or nearly to the middle of 

 the plate. Last ventral plate narrowed caudad, the caudal margin 

 widely incurved. Pseudopleural processes of moderate length; each 

 bearing three spines at tip, two lateral marginal ones well removed 

 from apex, and one on dorsal edge. Femur of anal legs armed ven- 

 trally with an ectal longitudinal row of three spines and a single spine 

 toward the mesal edge; mesally bearing a lower longitudinal row of 

 three spines and an upper one of two; a single spine at the dorso- 

 caudal angle. 



Length, near 40 mm. 



