90 
cous.  In  maculatus  the  frontal  region  of  the  céphalothorax  is  mesially 
fulvous  and  the  legs  palpi  and  tail  are  throughout  variegated.  In  for- 
mosus,  however,  the  frontal  region  and  the  brachium  are  entirely 
fuscous  and  the  distal  half  of  the  tail  is  fuscous  or  rufo-fuscous  and 
not  variegated.  Associated  with  these  differences  in  colouration  there 
are  certain  other  characters  —  such  as  a  smaller  number  of  pectinal 
teeth  (11  as  opposed  to  18),  a  distinctly  thicker  caudal  vesicle  etc. 
From  melanodactylus  it  also  differs  in  colouring ,  the  trunk  in  this  spe- 
cies being  of  a  more  uniform  tint,  the  humerus  being  wholly  pale  and 
the  brachium  bearing  only  one  or  two  fuscous  spots;  moreover  the  three 
proxinal  caudal  segments  are  uniformly  ochraceous  above.  Again  associ- 
ated with  the  colouring  certain  structural  features  may  be  noticed.  Thus 
melanodactylus  has  a  much  more  slender  vesicle  and  a  shorter  aculeus, 
while  the  terminal  granule  of  the  superior  caudal  keels  is  spiniform. 
From  assamensis  it  differs  in  the  colouring  of  the  palpi  as  it  does 
from  maculatus,  although  closely  approaching  the  former  in  the  colours 
of  its  tail  and  céphalothorax.  In  assamensis,  however,  there  are  16 
pectinal  teeth,  the  visicle  is  slender,  the  terminal  granule  of  the 
superior  caudal  keels  of  at  least  the  2Q<*  and  3Qd  segments  is  spini- 
form, the  median  keels  on  the  last  abdominal  sternite  are  obsolete 
and  the  whole  animal  is  much  less  strongly  granular. 
Farn.  SCORPIONIDAE. 
sub.  fam.  Iurini. 
Chaerilus. 
5.  Chaerilus  variegatus,  Simon.  (Pl.  VI.  fig.  4 -4a). 
Simon,  Ann.  Soc.  Ent.  Fr.  (5),  VII  p.  239,  pl.  Ill,  fig.  13  (1877)  and 
X,  p.  381  (1880). 
Kaesoh,  Mitth.  Münch.  Ent.  Ver.,  1879,  pp.  107-108. 
Three  specimens,  two  adult  and  one  immature,  from  Tjibodas  in  Java. 
Since,  so  far  as  I  know,  no  measurements  of  a  specimen  of  this 
species  have  yet  been  printed,  I  take  this  opportunity  of  publishing 
the  following  dimensions  in  millimetres  of  the  largest  of  the  three 
specimens.  Total  length  42.5;  céphalothorax,  length  6,  width  6.3,  dis- 
tance of  eyes  from  posterior  margin  3.8;  length  of  tail  21,  of  1st  segm. 
2,  of  2^  2.5,  of  3nd  2.8,  of  4*  3,  of  &h  5;  width  of  1st  3.7,  of  2»* 
3.1,  of  3*4  2.9,  of  4th  2.7,  of  5th  2.4,  of  vesicle  2.5,  length  of  vesicle 
