NO.    5      MALE  GENITALIA  OF  ORTHOPTEROID  INSECTS SNODGRASS        69 
little  from  the  wall  of  the  genital  chamber.  The  upper  surface  of  the 
dorsal  lobe  contains  a  wide,  cuplike  depression,  the  dorsal  cavity  (dc), 
from  the  lateral  walls  of  which  arise  a  pair  of  folds  (h)  with  sclero- 
tized  margins  (i)  that  end  in  free  horny  processes.  The  sclerotized 
parts  are  the  "  parameres  "  of  Walker,  the  supporting  folds  the  "  bases 
of  the  parameres."  The  phallotreme  (Phtr)  is  a  large  opening  in  the 
ventral  part  of  the  phallus  between  the  thickened  posterior  margin  of 
the  dorsal  lobe  above  (g),  the  lateral  lobes  at  the  sides  (//),  and  the 
ventral  lobe  below  (vl).  When  the  phallus  is  protracted  the  whole 
organ  forms  a  grotesque  vesicular  body  (fig.  26  B)  projecting  between 
the  epiproct  and  the  depressed  ninth  sternum  (A).  The  cavity  of  the 
dorsal  lobe  is  entirely  everted  (B,  dl),  and  the  folds  of  its  floor  are 
Fig.  26. — Tettigonioidea-Tettigoniiclae :  external  male  genitalia  of  Conocepha- 
lus  fasciatiis  (Degeer)  and  Neoconoccphahis  cnsiger  (Harris). 
A,  Conocephalus  fasciatus,  end  of  abdomen  with  phallus  everted,  lateral  view. 
B,  same,  posterior  view.  C,  Neoconoccphahis  ensiger,  phallus  in  retracted  con- 
dition, posterior  view. 
For  letter  explanation,  see  fig.  22. 
inflated  to  form  two  protruding  dorsal  vesicles  (h),  beneath  which  the 
sclerotic  bars  (z)  curve  to  the  sides.  The  lateral  lobes  likewise  are 
distended  as  pair  of  vesicles  (//)  at  the  sides  of  the  phallotreme;  but 
the  ventral  lobe  (vl)  is  not  changed  from  its  usual  form  (fig.  23  H,  vl). 
The  phallus  of  Neoconocephalus  ensiger  (fig.  26  C)  resembles  that 
of  ConocepJmlus  fasciatus.  In  the  retracted  condition  the  organ  is 
scarcely  more  than  a  low,  oval  fold  projecting  from  the  genital 
chamber  wall.  The  dorsal  lobe  is  occupied  by  a  deep,  open  cavity  {dc), 
on  the  floor  of  which  is  a  median  X-shaped  sclerotization  (i)  without 
projecting  points,  which  is  flanked  by  two  large,  soft  folds  {h).  The 
phallotreme  is  a  large  transverse  openmg  {Phtr).  The  lateral  lobes 
(//)  and  the  ventral  lobe  {vl)  are  present  as  usual,  but  the  ventral  lobe 
is  very  small. 
