428 Mr. R,. I. Pocock on new 



Genus Phyodesmus, Cook. 

 Phyodesmus, Cook, Braudtia, i. p. 1 (1896). 



Phyodesmus ornatus, sp. n. (Fig. 1, p. 431.) 



S- — Colour {\n alcohol) of dorsal surface bluish grey, the 

 middle of the back yellowish green ; the cylindrical part of 

 the segments with a broad blackish blotch on each side, 

 separated by a triangular paler portion ; keel-bearing portion 

 of segments furnished with two or three black spots on each 

 side in front and a few more behind ; at the end of the body 

 these spots show a tendency to fuse and form continuous dark 

 bands; pores black; antennas and legs blackish. 



Length of antennce excelling width of first tergite by about 

 half its own width, less than width of second. 



First tergite with its angles produced, the anterior border 

 straight between them. Second segment about as wide as 

 the twelfth. The anterior seven segments with merely lobulate 

 side margins, the rest with two or three distinct though short 

 triangular teeth ; anterior border of keels convex, with 

 rounded basal shoulders, posterior border lightly sinuous, both 

 smooth. Pore on fifth and seventh segments about three 

 diameters from the edge, on the toothed keels not more than 

 two diameters from the notch. Caudal process posteriorly 

 narrowed, posterior border straight but laterally notched. 



Copidatory foot (as in fig. 1) straight, ending in a shorter 

 blade-like ramus and a longer curved prong, from which 

 projects a smaller lamina. 



Measurements in millimetres, — Total length 100; width of 

 second segment 14'5, of fifth 16, of twelfth 14'8. 



Loc. Borneo {Rev. G. Brown). 



Phyodesmus Uosei, sp. n. (Fig. 2.) 



c? . — Resembling the preceding, but bluer in colour, without 

 yellowish- green dorsum, and the black patches on the 

 cylindrical part of the segments separated by a narrower pale 

 band. 



Keels also considerably larger, with the teeth much stronger, 

 appearing as far forwards as the fifth segment ; on the 

 posterior segments long and sharp, the pore being often quite 

 close to the adjacent notch. 



Copulatory foot much longer, the long prong broader at 

 the base, the short ensiform process much shorter and not 

 projecting as straight forwards. 



Measurements in millimetres. — Total length (at least) 96 ; 

 width of second segment 15, of fifth 17*7, of twelfth 16. 



Loc. Baram, Borneo [C. Hose). 



