349 
to  the  18*h  oblique  i.  e.  converging  posteriorly,  those  in  the  poste- 
rior half  of  the  body  cut  out  usually  into  five  or  four  teeth,  the 
anterior  and  posterior  of  which  are  formed  by  the  anterior  and 
posterior  angles,  sometimes,  however,  there  is  but  one  tooth 
between  the  angles;  lateral  portions  of  somites  coriaceous  but  not 
granular;  sternal  area  furnished  with  four  tubercles,  one  at  the 
base  of  each  leg.  Anal  somite;  tergite  produced  posteriorly  into  a 
wide  parallel-sided  plate ,  with  rounded  posterior  angles ,  and  lightly 
convex  and  obscurely  lobate  hinder  border;  the  lateral  portion  bea- 
ring posteriorly  two  tubercles  whereof  the  superior  is  much  the 
larger;  sternite  with  two  tubercles  on  its  posterior  border;  anal  valves 
coriaceous  with  margins  compressed,  each  bearing  a  single  tubercle. 
Legs  closely  hairy. 
cf.  Smaller  (i.  e.  shorter  and  relatively  narrower)  and  flatter  than 
the  Ç,  with  the  keels  markedly  less  depressed. 
Copulatory  feet  somewhat  short;  the  second  segment  hairy  and  stout 
at  the  base  and  giving  off  above  (or  anteriorly  and  internally)  a  short 
spiniform  process,  produced  distally  into  a  stoutish  piece  which  ends 
in  two  (an  upper  and  a  lower)  outwardly  directed,  curved  slender, 
subequal  processes. 
9  (large  sp.).  Length  134  mm.,  width  of  l*t  segm.  11,  of  10th  21.5,  of  19th  9.5. 
?  »     113    „       „     „  10th  n  18.5. 
44.  Platyrhachus  laticollis,  sp.  n.  Pl.  XX,  fig.  8  —  8Ô. 
Sumatra:  Manindjau,  Muka-Muka,  Ajer  Mantjur. 
9.  Colour  piceous  or  almost  black;  the  keels  flavous,  the  caudal 
plate  with  its  hinder  border  broadly  or  narrowly  flavous;  legs  and 
antenna  varying  from  flavous  to  fusco-ochraceous. 
Head  and  antennœ  normal. 
The  first  tergite  wider  than  the  head,  about  twice  as  wide  as  long, 
flat  with  distinct  and  elevated  keels,  a  transverse  impression  before 
the  anterior  border,  finely  and  closely  granular  throughout,  a  series 
of  larger  granules  along  the  anterior  and  posterior  borders.  Second 
and  third  and  fourth  segments  with  their  keels  nearly  horizontal  and 
directed  obliquely  forwards.  Keels  of  the  rest  also  horizontal,  rising  in 
the  upper  half  of  the  side,  those  of  the  fifth,  sixth,  seventh  and 
eighth  with  their  posterior  borders  in  a  straight  line,  those  of  the 
rest  becoming  progressively  more  and  more  directed  backwards;  the 
2:i 
