SMITHSONIAN    MISCF.LLANEOUS    COLLECTIONS 
VOL. 
96 
In  Orcheliinum  iniiwr  the  phallus  is  characterized  by  the  great  devel- 
opment of  the  ventral  lobe  (fig.  27  B,  zd),  which  projects  as  a  large 
flap  from  beneath  the  phallotreme.  The  shallow  dorsal  cavity  (dc) 
contains  two  thick  lateral  folds  (h),  each  of  which  is  armed  with  a 
long,  curved,  sclerotic  band  (i)  arising  on  the  median  side  of  the 
fold  and  curving  laterally  around  its  distal  end.  The  sclerites  are 
bifurcate  at  their  terminations,  but  only  the  outer  points  project  as 
AcGlds 
Fig.  2y. — Tettigonioidea-Tettigoniidae :    male  genitalia  of  Orchelimuvi  minor 
B  runner. 
A,  end  of  abdomen,   lateral  view.    B,   phallus,   posterior  view.    C,   internal 
genitalia  and  phallus,  lateral  view.    D,  testis  and  adjoining  part  of  vas  deferens. 
For  letter  explanation,  see  fig.  22. 
free  processes.  The  posterior  margin  of  the  floor  of  the  dorsal  cavity 
forms  a  wide,  bilobed  lip  {g)  above  the  phallotreme,  at  the  sides  of 
which  project  the  triangular  lateral  lobes  (//). 
The  Decticinae  present  several  important  modifications  of  the 
phallic  structure  that  are  not  found  in  the  other  tettigoniid  families, 
but  which  prefigure  some  of  the  characteristic  features  of  the  phallus 
in  Rhaphidophorinae  and  Gryllidae.  The  dorsal  cavity  of  the  phallus, 
for  example,  is  converted  into  a  deep  pouch  (fig.  22  F,  dc),  apparently 
