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SMITHSONIAN    MISCELLANEOUS    COLLECTIONS  VOL.    96 
just  beyond  them  arises  from  the  cereal  trunks  a  pair  of  phallic 
nerves  (PhNv)  that  go  to  the  phallus  and  the  ejaculatory  duct.  The 
phallus  and  the  ectodermal  part  of  the  ejaculatory  duct,  therefore, 
must  be  derivatives  of  the  tenth  segment,  since  it  is  improbable  that 
they  belong  to  the  eleventh  segment,  and  they  have  no  connections  with 
the  nerves  of  the  ninth  segment.  The  proctiger,  the  terminal  part  of 
the  rectum  (Red),  and  the  large  anal  glands  (AnGld)  derive  their 
innervation  from  branches  of  the  cereal  nerves. 
In  contrast  to  the  condition  in  the  male,  the  lateral  oviducts  of  the 
female  (fig.  40  A,  B,  Odl)  turn  downward  behind  the  nerves  of  the 
Odl—    ' 
VUlNv 
Odl 
Rect 
Eppt— ' 
Fig.  40 : — Tettigonioidea-Gryllotalpidae :  internal  female  genitalia  and  asso- 
ciated structures  of  Scapteriscus  vicinus  Scudder. 
A,  posterior  part  of  abdomen,  showing  reproductive  organs  and  nerves,  ven- 
tral view.  B,  innervation  of  posterior  abdominal  organs  from  last  ganglion  of 
ventral  nerve  cord,  ventral  view. 
For  letter  explanation,  see  fig.  39. 
seventh  segment  (VIINv).  The  primitive  openings  of  the  paired  ovi- 
ducts, therefore,  must  have  been  at  a  position  between  the  nerves  of 
segments  VII  and  VIII,  and  hence  probably  on  the  posterior  part  of 
segment  [ '//.  The  innervation  of  the  following  segments  in  the  female 
of  Scapteriscus  (B)  is  essentially  the  same  as  that  in  the  male  except 
for  the  absence  of  phallic  nerves.  The  median  oviduct  and  the  genital 
chamber  appear  to  be  innervated  from  the  second  pair  of  lateral  nerves 
in  segment  VIII  (A). 
X.   ACRIDOIDEA 
The  phallic  organ  of  the  Orthoptcra  attains  in  the  Acrididae  its 
highest  degree  of  development  and  integration  into  a  mechanism  of 
