NO.    5      MALE  GENITALIA  OF  ORTHOPTEROID  INSECTS — SNODGRASS        67 
simple  anatomical  relations  of  its  parts,  includins^-  the  endophallic 
cavity  (Enph)  that  receives  the  ejaculatory  duct  (Dej).  In  the  closely 
related  M.  rhonihifolium  the  phallus  has  the  same  general  structure 
as  that  of  retinerve,  but  the  organs  of  the  dorsal  cavity  are  absent. 
A  nymphal  condition  of  the  phallus  appears  to  be  retained  in  the 
adult  of  Amhlycorypha  oblongifoUa,  since  the  phallic  organ  is  here  a 
small,  soft,  compact  body  presenting  a  broad,  flat  dorsal  surface  with- 
out the  usual  dorsal  cavity  and  armature.  The  endophallic  cavity, 
however,  contains  a  flat,  tonguelike  fold  that  divides  it  into  a  dorsal 
Fig.  25. — Tettigonioidea-Tettigoniidae :  abdomen  and  genitalia  of  male  of 
Phancroptera  jurcata  (Brunner). 
A,  end  of  abdomen,  lateral  view.  B,  tenth  tergum  and  cerci,  dorsal  view. 
C,  tenth  and  eleventh  abdominal  segments,  ventral  view.  D,  phallus,  posterior 
view.  E,  same,  dorsal  view.  F,  same,  median  longitudinal  section.  G,  phallus 
and  associated  internal  organs,  ventral  view. 
For  letter  explanation,  see  fig.  22. 
and  a  ventral  compartment.  The  fold  arises  by  a  narrowed  base  above 
the  gonopore,  and  ends  with  two  small  divergent  lobes  projecting  from 
the  phallotreine. 
In  the  genus  Phancroptera  the  male  "  terminalia  "  include  numerous 
modifications  of  the  ninth,  tenth,  and  eleventh  abdominal  segments. 
In  ^.  fiircata  (fig.  25  A)  the  tergum  of  the  ninth  segment  resembles 
the  tergal  plates  preceding  it,  but  the  ninth  sternum  (IXS)  is  produced 
posteriorly  in  a  long,  slender,  tapering,  trough-shaped  extension, 
strongly  curved  upward,  ending  in  a  narrow  truncate  margin.  Styli 
are  absent  unless  they  are  represented  by  two  small  nodules  on  the 
