99 
This  species  is  evidently  related  to  H.  insculptus  of  Thorell x)  from 
New-Guinea  —  the  only  true  species  of  the  genus  of  which  the 
British  Museum  does  not  possess  examples.  If,  however,  the  female 
be  comparad  with  Thorell's  description,  certain  differential  characters 
can  be  made  out,  which  lead  me  to  believe  that  the  specimens  here 
described  are  rightly  to  be  considered  as  examples  of  a  new  species. 
Thus  the  cephalotorax  of  insculptus  is  apparently  much  more  granular, 
the  tail  is  longer,  being  about  2|  times  the  length  of  the  céphalothorax 
as  opposed  to  2j;  the  hand-back  in  insculptus  is  considerable  longer 
than  the  céphalothorax,  while  in  weberi  it  is  not  longer;  again  the 
height  of  the  hand  as  compared  with  its  length  is  much  greater  in 
weberi;  moreover  the  lateral  eyes  are  equidistant  in  weberi  and  much 
more  prominent  i.  e.  a  line  drawn  at  right  angles  to  the  long  axis 
of  the  body  as  a  tangent  to  the  frontal  lobes  will  touch  the  anterior 
lateral  eye  on  each  side. 
1)  Ann.  Mus.  Genov.  (2),  VI,  pp.  422—426. 
DESCRIPTION  OP  PLATE  VI. 
Fig.  1.  Isometrus  mucronatus  (Fabr.),  Q  nat.  size. 
»  2.  »       flavimanus,  Thor.,  Q  nat.  size. 
»  2a.  »               »  dentition  of  chela. 
»3.  »  formosus,  sp.  n.,  Q,  nat.  size. 
»  3a.  »            »          x>    »     »    dentition  of  chela. 
»  3&.  »           »         »    »     »  vesicle. 
»  3C<  »            »         »    »     »    vesicle  of  1.  maculalus. 
»  4.  Chaerilus  variegatus,  Simon,  nat.  size. 
»  4a.  »             »            »  sternum. 
»  5.  »        cavernicola ,  sp.  n. ,  nat.  size. 
»  5a,  »               »          v    »    sternum  and  pectines. 
*  6.  Scorpio  indicus  ,  (Linn.) ,  Q ,  nat.  size. 
»  7.  Hormurus  weberi,  cT,  nat.  size. 
»  7a.       »  »            anterior  part  of  céphalothorax. 
»  76.  »            »            sternum  and  pectines. 
