338 
sented  (?  always)  on  the  edge  of  the  body.  The  pores  situated  upon 
the  surface  of  the  terga  above  the  lateral  margin.  The  terga  without 
or  with  scarcely  a  trace  of  a  median  dorsal  suture. 
The  head  and  anal  valves  not  largely  overlapped  by  the  1*  and  last 
terga  respectively. 
Legs  longer  or  shorter,  but  their  coxae  are  close  together  in  the 
middle  line,  the  sternal  area  being  scarcely  apparent. 
Siphonotus  y  Brandt. 
Bull.  Sc.  Ac.  St.  Petersburg  I,  no.  23,  p.  179,  1837. 
Resembling  Polyzonium  but  with  the  body  long  and  slender  and 
the  antennae  separated  by  a  relatively  wide  frontal  space;  with  a 
single  ocellus  on  each  side.  (?  always). 
Type  S.  brasiliensis ,  Brandt. 
The  type  of  this  genus  is  unknown  to  me;  but  I  have  seen  several 
species  from  different  parts  of  the  tropics,  which  agree  closely  with 
Brandt's  generic  description. 
It  is  not  improbable  that  the  discovery  of  fresh  forms  will  show 
that  the  genera  Polyzonium  and  Siphonotus  pass  into  one  another. 
P.  germanicum  is  the  only  species  of  the  former  known  to  me,  and 
it  is  recognisable  from  the  species  that  I  refer  to  Siphonotus  by  its 
broad  leech-like  body,  by  the  narrow  frontal  space  between  the  an- 
tennae and  by  the  presence  of  3  (?more)  ocelli  on  each  side  of  the  head. 
» 
35.  Siphonotus  formosus  sp.  n.  PL  XX,  fig.  5 -5a. 
Java:  Tjibodas;  several  specimens. 
Colour  black  or  bluish  gray,  with  a  wide  median  dorsal  longitudinal 
band;  the  firt  two  and  last  two  segments  also  white;  face,  antennae 
and  legs  infuscate. 
Head  hairy  below. 
Antennae  longer  than  the  head,  narrower  at  the  base  and  at  the 
apex  than  at  the  4*  and  5«*  segments. 
Body  strongly  convex  above,  flat  below  very  finely  hairy,  atten- 
uated anteriorly  and  posteriorly,  the  posterior  half  of  each  segment 
higher  than  the  anterior,  the  lateral  margin  thickened.  The  anterior 
pore  larger  than  the  rest. 
Legs  short,  entirely  covered,  the  6th  segment  long  and  slender ,  the 
rest  of  the  segments  subequal  in  length. 
