373 
The  2n<1  segment  wider  laterally  than  the  3râ  and  projecting  below 
it;  lateral  edge  of  the  keel  tri-lobed,  a  single  lobe  on  its  posterior 
border,  upper  side  of  keel  not  tubercular,  the  rest  of  the  seg- 
ments strongly  tubercular,  with  4  longitudinal  ridges  of  3  tubercles 
each.  The  following  segments  generally  resembling  the  2nd,  the  keels 
with  a  large  posterior  lobe  and  a  bilobed  lateral  border;  those  that 
bear  pores  have  the  anterior  marginal  lobe  itself  subdivided  and  the 
posterior  one  which  supports  the  pore,  much  less  prominent  than  the  other. 
Length  about  6  mm.,  width  less  than  1. 
Cryptodesmus ,  (Peters),  Karsch. 
Synopsis  of  the  species. 
a.  The  head  not  covered  by  a  laminate  expansion  of  the  Is*  tergite; 
keels  distally  narrowed,  pointed,  with  the  posterior  border  cut 
out  into  dentiform  lobes  ;  the  5th  and  gth  segments  of  the  antennas 
not  externally  expanded  into  a  protuberance;  legs  longer  and  thinner 
bicolor  sp.  n. 
b.  The  head  covered  by  an  expansion  of  the  1st  tergite  :  keels  scarcely 
narrowed  distally;  the  5th  and  6th  segments  of  the  anteunae  externally 
produced  in  to  a  process;  legs  shorter  and  stouter. 
a1.  The  tergites  covered  with  rows  of  distinct  rounded  tubercles. 
a2.  The  anterior  angles  of  the  keels  more  squared  and  the  lateral 
and  posterior  borders  more  conspicuously  dentate;  mostly 
with  4  rows  of  tubercles  .  .  .  ,  concolor. 
b2.  The  anterior  angles  rounder,  the  lateral  border  scarcely  denti- 
culate and  the  posterior  border  weakly  lobate;  mostly  5  rows 
of  tubercles  weberi. 
b\  The  ornamentation  of  the  tergites  much  less  conspicuously  tuber- 
cular, more  areolate;  the  lateral  border  more  strongly  dentate 
sumatranus. 
70.  Cryptodesmus  bicolor,  sp.  n.  Pl.  XXI,  fig.  5-5/*. 
Sumatra:  Singkarah. 
Colour  greyish  brown  above,  the  keels  of  the  6th,  8th,  nth  14th 
and  16th  somites  flavous;  sterna,  legs  and  lower  surface  of  head  flavous. 
9.  Head  sulcate  above  and  very  finely  and  closely  granular;  smooth 
and  finely  punctured  below. 
Ântennœ  short,  clavate;  all  the  segments  short,  the  2^,  3^,  4th  and 
