348 
approuch  nearest  to  P.  fuscus  of  Kooh,  but  the  latter  is  far  too 
thick  at  the  anterior  and  posterior  ends  of  the  body  ;  the  anterior 
borders  and  angles  of  the  keels  are  too  rounded,  the  former  being  not 
shouldered  at  the  base;  the  posterior  angle  is  spiniform  and  the 
pore  is  too  far  from  the  lateral  margin. 
In  addition  to  the  known  Javan  species  which  have  already  been 
noticed,  the  two  following  seem  to  be  quite  distinct  from  the  three 
new  ones  here  described. 
P.  pfeifferœ,  Humbert  and  Saussure  (op.  cit.  p.  680),  from  Batavia, 
has  the  body  smooth  and  nearly  parallel  sided;  it  is  moreover  very 
large  (101  mm.),  and  the  pores  are  placed  near  the  middle  of  the  dorsal 
surface  of  the  keels.  P.  princeps,  Gervais  (Ins.  Apt.  IV,  p.  100)  is  also 
a  very  large  species  (110  mm.).  It  is  pale  brown  and  has  two  yellow 
spots  upon  the  dorsal  surface  of  the  cylindrical  part  of  the  segments. 
43.  Platyrhachus  mirandus,  sp.  n.  Pl.  XX,  fig.  7  —  lb. 
Sumatra:  Manindjau,  Muka-Muka,  Ajer  Mantjur. 
Colour  (in  alcohol)  ;  upper  surface  a  deep  bluish  or  greenish  or  even 
pinkish  grey,  the  very  margins  of  the  keels  flavous;  two  nearly  white, 
elongate,  anteriorly  abbreviated  spots  on  the  upper  surface  of  the 
anterior  cylindrical  half  of  each  somite  ;  the  lateral  portions  of  the 
somites  deep  purple  or  chocolate  brown;  the  lower  surface  and  a 
narrow  space  above  the  joints  for  the  legs  ochraceous  or  ferruginous; 
legs  and  antennae  brunneous  or  ferruginous,  basal  two  segments  of  the 
legs  ochraceous;  head  of  about  the  same  colour  as  the  tergites  but  darker. 
Q.  Head  with  a  conspicuous  frontal  sulcus,  laterally  subgranular. 
First  tergite  wider  than  head,  about  twice  as  wide  as  long,  lightly 
coriaceous,  its  anterior  lateral  angles  produced  into  a  distinct,  de- 
pressed, rounded  keel,  its  anterior  border  convex,  its  posterior  border 
very  nearly  straight.  The  remaining  tergites  lightly  convex ,  not  granular 
but  coriaceous  with  very  faint  indications  of  three  transverse  series 
of  granules;  the  keels  not  quite  horizontal,  the  external  border  oblique 
i.  e.  higher  behind  than  in  front,  the  keels  at  the  posterior  end  of  the 
body  nearly  horizontal ,  the  hinder  borders  of  the  last  six  keels  directed 
backwards  and  those  of  the  first  four  directed  forwards,  those  of  the 
intermediate  segments  gradually  changing  their  direction  ;  the  anterior 
border  of  all  the  keels  from  the  10th  to  the  19th  lightly  convex  and 
directed  backwards,  not  shouldered  the  lateral  borders  from  the  4th 
