371 
Resembling  Gyrtodesmus  in  the  large  size  of  the  2nd  segment,  de- 
pression and  size  of  the  keels  of  the  rest  of  the  segments,  position 
of  the  pore,  proximity  of  legs  etc.  but  easely  separable  by  the  pre- 
sence of  the  dorsal  tooth. 
68.  Doratonotus  armatus ,  sp.  n.  Pl.  XXII,  fig.  11  — lie. 
Java:  Buitenzorg  and  Tjibodas. 
Colour  (in  alcohol);  upper  surface  deep  dull  black,  keels  ochraceous 
the  three  posterior  processes- of  the  dorsal  series  also  ochraceous,  the 
rest  being  black;  head  black,  labrum  and  apex  of  antennae  and  legs 
testaceous. 
Head  rugose  above,  without  vertical  sulcus;  labral  region  defined 
above  by  a  deep  arched  groove,  its  sides  parallel,  its  inferior  margin 
convex  at  the  sides,  concave  and  dentate  in  the  middle,  the  surface 
of  the  region  with  a  transverse  arched  series  of  fossulsß  and  a  series 
of  punctures  along  its  upper  border.  Antennœ  short  and  tolerably 
thick,  the  1st  and  7th  segments  the  smallest,  the  6th  the  largest,  the 
2Dd,  3«d,  4th  and  5th  subequal  in  length. 
The  first  tergite  small,  about  as  wide  as  the  head,  hollowed  in 
the  middle,  its  anterior  border  convex  from  side  to  side ,  its  side  pro- 
duced into  a  rounded  angle,  its  posterior  margin  straight  in  the 
middle.  Second  tergite  finely  granular,  flat  or  nearly  so  in  the  middle 
line  above,  furnished  with  large  rounded  close  set  tubercles  on  each 
side,  its  anterior  margin  concave  above,  the  plane  of  the  keel  nearly 
vertical,  its  anterior  and  inferior  margins  strongly  convex,  the  pos- 
terior margin  nearly  straight  but  both  anterior  and  posterior-margins 
distinctly  lobate.  3rd  and  4th  segments  with  sides  of  the  upper  surface 
elevated  and  lowly  tubercular,  the  keels  with  upper  surface  convex 
from  base  to  point,  the  anterior  and  posterior  borders  converging, 
the  anterior  border  nearly  straight,  the  posterior  distinctly  uni-lobate 
near  its  base,  the  upper  surface  of  the  4th  with  posterior  tubercle 
on  each  side  large.  The  rest  of  the  segments  bearing  a  dorsal  median , 
backwardly  directed ,  superiorly  sulcate  and  apically  bifid  process,  which 
increases  in  length  and  strength  from  the  5th  to  the  15th,  on  the 
14th  it  is  small;  the  keels  narrowed  distally,  distinctly  bilobate  at  the 
base  posteriorly,  in  the  middle  of  the  body  the  extremity  is  rounded  at 
the  posterior  end,  the  anterior  angle  is  convex  and  the  posterior 
slightly  produced.  Anal  tergite  without  a  median  process,  coarsely 
