90  SMITHSONIAN    MISCELLANEOUS    COLLECTIONS  VOL.    96 
Proximal  to  the  anterior  lip  (g)  of  the  dorsal  cavity  is  the  deep, 
pouchlike  endophallic  cavity  (C,  F,  Enph),  the  soft  walls  of  which 
are  thrown  into  rugose  folds.  The  endophallus  is  mostly  closed  below 
by  the  wide,  quadrate  ventral  lobe  {vl) ,  which,  when  viewed  endwise 
(D),  is  seen  to  have  its  lateral  margins  inflected  as  two  broad  flaps. 
The  ejaculatory  duct  (F,  Dej)  opens  by  a  funnel-shaped  enlargement 
directly  into  the  endophallic  cavity. 
In  the  normal  position  of  the  genital  parts  of  Nemohius  the  ninth 
abdominal  sternum  entirely  conceals  the  phallus  from  below  (fig. 
36  A)  ;  a  high  median  fold  of  its  dorsal  surface  fits  closely  into  the 
cavity  on  the  ventral  surface  of  the  dorsal  phallic  lobe  (F),  and  a 
soft  end  lobe  of  the  sternum  {si)  plugs  the  entrance  to  the  dorsal 
cavity  between  the  terminal  processes  of  the  epiphallus  (A,  si). 
The  spermatophore  of  Nemohius  resembles  that  of  Gryllus  in  that 
it  consists  of  a  sperm-containing  ampulla  with  a  long  recurved  duct, 
but  the  attachment  plate  appears  to  be  an  expansion  of  the  duct  near 
its  distal  end  (see  Lespes,  1855;  Gerhardt,  1913;  Baumgartner, 
1 911;  Fulton,  1931).  The  spermatophore  of  Nemohius  fasciatus  is 
described  by  Fulton  as  having  a  spherical  ampulla  about  i^  mm  in 
diameter,  and  a  flattened  curved  tubular  duct  about  2^  mm  long  with 
an  expanded  part  near  the  recurved  tip.  By  comparison  with  Gryllus 
it  would  seem  that  the  ampulla  of  the  spermatophore  of  Nemohius 
must  be  molded  likewise  in  the  endophallic  cavity,  and  the  duct  formed 
in  the  median  channel  of  the  dorsal  cavity  (fig.  36  C,  F).  Fulton 
gives  a  figure  showing  the  walls  of  the  dorsal  cavity  of  the  phallus 
evaginated  in  the  form  of  a  large,  grooved  fold  with  the  ampulla 
hanging  free  from  its  lower  end,  and  the  duct  lying  in  the  groove  of 
the  fold.  He  describes  the  formation  of  the  duct  in  the  groove  as  it 
appears  when  the  spermatophore  is  first  seen  on  the  male,  but  this 
stage  must  be  after  the  ampulla  has  been  formed  in  the  endophallus 
and  ejected  from  the  latter.  The  end  of  the  duct  at  the  time  of  its 
insertion  into  the  female  is  probably  held  in  the  slot  of  the  terminal 
lobe  of  the  dorsal  cavity  (fig.  36  C,  v)  between  the  epiphallic  processes. 
The  spermathecal  aperture  of  Nemohius,  as  in  Gryllus,  is  situated  on 
the  end  of  a  small  knoblike  papilla  of  the  dorsal  wall  of  the  genital 
chamber,  and  Fulton  observes  that  this  knob  "  is  about  the  right 
size  to  be  grasped  by  the  male  claspers  (epiphallic  armature),  which 
would  bring  the  tip  of  the  spermatophore  tube  to  the  hole  in  the  apex 
of  the  knob." 
The  development  of  the  phallus  of  Neuiohius  is  somewhat  simpler 
than  that  of  Gryllus,  and  leaves  little  doubt  that  the  grillid  organ  is 
a  modification  of  the  more  generalized  phallic  structure  of  the  Tet- 
