^2  SMITHSONIAN    MISCELLANEOUS    COLLECTIONS  VOL.    96 
phallus.  From  it  there  arise  laterally  two  thick,  membranous  folds 
(C,  K),  and  closely  associated  with  the  base  of  each  fold  is  a  large 
U-shaped  sclerite  (/),  the  inner  arm  of  which  is  prolonged  posteriorly 
as  one  of  the  free  serrate  processes  (i)  above  noted.  The  distal  margin 
of  the  floor  of  the  dorsal  pouch  (^)  forms  the  upper  lip  of  the  phal- 
lotreme  (B,  Phtr).  That  the  roof  of  the  dorsal  sac  is  formed  by  the 
posterior  extension  of  the  anterior  margin  of  the  usual  dorsal  cavity 
(fig.  22  D,  e)  is  shown  by  the  fact  that  the  insertions  of  the  dorsal 
retractor  muscles  (fig.  28  B,  rpd)  are  carried  posteriorly  to  points 
laterad  of  the  mouth  of  the  sac.  The  fold  (e)  forming  the  upper  lip 
of  the  dorsal  sac  is,  therefore,  not  the  same  as  the  fold  over  the  base  of 
the  dorsal  cavity  in  Phaneroptera  furcata  (fig.  25  D,  E,  F,  /),  for 
here  the  dorsal  muscles  (E,  rpd)  are  attached  on  the  base  of  the 
phallus  and  not  on  the  fold.  The  rest  of  the  phallus  of  Anabrus 
(fig.  28  B)  has  the  usual  tettigoniid  structure.  The  ventral  cavity 
("  spermatophore  sac "  of  Walker)  is  the  endophallic  cavity,  the 
large  expanded  lobes  at  its  sides  (11)  are  the  lateral  lobes,  and  the 
small  median  lobe  beneath  it  (vl)  is  the  ventral  lobe. 
There  would  seem  to  be  no  question  that  the  Decticinae  are  true 
tettigoniids,  since,  according  to  Gerhardt  (1913),  the  spermato- 
phore contains  two  sperm  capsules,  as  in  all  other  members  of  the 
Tettigoniidae. 
The  mating  habits  of  the  Tettigoniidae  are  well  known  (See  Ger- 
hardt, 1913).  The  male  at  first  takes  a  position  beneath  the  female 
and  inserts  into  the  genital  chamber  of  the  latter  the  neck  of  a  large, 
bilobed  spermatophore,  the  principal  part  of  which  hangs  outside  the 
vulva  (fig.  29  A,  Sphr),  and  generally  is  later  eaten  by  the  female. 
With  some  species  the  male  assumes  a  reversed  and  inverted  position 
before  copulation  is  completed. 
The  tettigoniid  spermatophore  (not  including  that  of  Rhaphi- 
dophorinae)  is  said  by  Gerhardt  (1913)  to  contain  always  two 
sperm  capsules,  thus  differing  from  the  spermatophores  of  members 
of  related  families,  which,  so  far  as  known,  have  but  a  single  capsule. 
A  typical  tettigoniid  spermatophore  (fig.  29  C)  consists  of  two  oval, 
thick-walled  sperm  capsules  {a,  a)  more  or  less  enveloped  in  a  bilobed 
mass  of  white  albumenlike  substance  (c).  The  two  capsules  are  united 
on  a  cylindrical  stalk,  or  neck  (&),  which  projects  through  the  outer 
covering  and  is  inserted  into  the  female  genital  chamber  (A)  at  the 
time  of  copulation.  Each  capsule  contains  a  relatively  small  inner 
cavity  (C,  d)  filled  with  spermatozoa,  from  which  a  slender  duct 
enters  the  base  of  the  spermatophore  stalk.  In  the  species  here  illus- 
trated, AmblycorypJia  rotundifolia,  the  two  primary  ducts  appear  to 
