fl'.  Pores  normal  in  number;  the  two  branches  of  the  phallopod  shorter,  the
auxiliary  branch  usually  much  shorter,  never  longer  than  the  palmar  portion
of  the  segment Rhysodesmus.
STENODESMUS.
Stenodesmus,  Saussure,  Linn.  Ent.  xiii.  p.  327  (1859);  Mem.  Soc.  Phys.  Geneve,  xv.  p.  539(1860);
and  of  subsequent  authors.
llelated  to  Rhysodesmus  apparently  in  all  essential  features,  even  in  the  form  of  the  phallopod,  but  with  the
pores  absent  from  all  the  segments,  with  the  exception  of  the  fifth.  Accoi-ding  to  Carl,  the  terminal
segment  of  the  phallopod  has  a  single  superior  auxiliary  branch,  which  is  long  and  slender  and  projects
parallel  with  the  main  or  seminal  branch,  but  falls  considerably  short  of  its  apex  ;  it  rises  close  to  its
base.     The  main  or  seminal  branch  is  long,  lightly  curved,  and  hooked  at  the  tip.
Distribution.  Mexico.
1.  Stenodesmus  mexicanus.
Stenodesmus  mexicanus,  Sauss.  Linn.  Ent.  xiii.  p.  327  (1859)  ' ;  Mem.  Soc.  Phys.  Geneve,  xv.
p.  539,  t.  3.  fig.  21  (1860)  ' ;  Carl,  Rev.  Suisse  Zool.  xi.  p.  561,  fig.  20  (1903)  '.
Colour  maroon-brown,  with  the  edges  of  the  keels,  the  legs,  and  the  underside  yellowish.
