370 
67.  Centrodesmus  typicus,  sp.  n.  Pl.  XXII,  fig.  10—10°. 
Sumatra:  Manindjau.  A  single  9  specimen. 
Colour  dull  brown,  legs,  sternal  areas  and  apical  segments  of  an- 
tennae paler. 
Head  finely  and  closely  granular  above.  The  keels  of  the  1st  segment 
with  a  distinct,  anterior  rounded  shoulder,  the  anterior  border  convex 
the  posterior  concave,  both  finely  serrate.  The  rest  of  the  keels  an- 
teriorly convex,  posteriorly  concave,  pointed  at  the  apex  and  armed 
with  a  few  small  teeth  in  front  of  the  apex,  those  that  bear  pores 
rather  more  strongly  denticulate  than  the  rest,  the  keels  of  the  15th 
directed  almost  directly  backwards  and  upwards.  There  is  a  faint 
transverse  sulcus  extending  backwards  from  the  5th  segment.  The 
upper  and  lateral  surface-  finely  granular  and  coriaceous  ;  no  crest  or 
keel  above  the  base  of  the  legs.  Sternal  areas  of  average  size,  not 
spined. 
Legs  with  coxa  and  trochanter  short,  femur  about  4  times  as 
long  as  the  trochanter  and  about  4  or  3  times  as  long  as  the  patella; 
distance  between  the  legs  in  the  middle  of  the  body  i.e.  width  of 
sternal  area  equal  to  about  twice  the  length  of  a  trochanter ,  distance 
between  those  of  the  posterior  pair  a  little  greater  than  the  length 
of  one  of  these  segments. 
Total  length  37  mm.;  width  across  keels  5  mm.;  width  between 
keels  3.5. 
Doratonotus,  gen.  nov. 
Antennœ  short,  incrassate,  segments  2-6  subequal  in  length. 
First  tergite  about  as  wide  as  the  head  and  not  covering  it.  Second 
tergite  very  large,  expanded  and  depressed  laterally  as  in  Glomeris. 
The  rest  of  the  tergites,  except  the  last,  with  large  depressed  keels, 
except  the  first  4  and  the  20^  armed  dorsally  with  a  strong  back- 
wardly  directed  median  process. 
Pores  on  segments  5,  7,  9,  10,  12,  13,  15-19,  situated  near 
the  middle  of  the  dorsal  surface  of  the  keels. 
Anal  tergite  with  convex  lobate  posterior  border.  Sternite  triangular. 
Legs  in  contact  in  the  middle  line,  owing  to  the  absence  of  sternal 
areas ,  the  trochanter  about  half  the  length  of  the  femur ,  the  patella 
and  tibia  very  short  and  subequal  in  length,  the  tarsus  long. 
