NO.    5      MALE  GENITALIA  OF  ORTHOPTEROID  INSECTS — SNODGRASS        ']Z 
unite  in  a  single  duct  (<?)  that  traverses  the  stalk  and  ends  in  a  free 
terminal  point  (/).  According  to  Gerhardt,  however,  the  tettigoniid 
spermatophore  characteristically  has  two  separate  ducts. 
The  substances  that  form  the  outer  and  inner  parts  of  the  spermato- 
phore are  undoubtedly  secreted  in  different  sets  of  the  accessory  gland 
tubules  of  the  male.  The  outer  covering  is  said  by  Gerhardt  to  vary 
in  dift'erent  tettigoniid  species  from  a  semifluid,  slimy  consistency  to 
the  more  usual,  fairly  solid  texture  resembling  coagulated  egg  albu- 
men.   The  walls  of  the  sperm  capsules  are  dense,  laminated,  and  of 
Fig.  29. — Tettigonioidea-Tettigoniidae :  female  genitalia  and  a  spermatophore 
of  Amblycorypha  roiiDidifolia   (Scudder). 
A,  end  of  abdomen  with  spermatophore  attached.  B,  spermatheca,  duct,  and 
pocket  of  genital  chamber.    C,  spermatophore. 
a,  sperm  capsules  of  spermatophore ;  b,  stalk  of  spermatophore ;  c,  albuminous 
covering  of  spermatophore ;  d,  sperm  chamber  of  sperm  capsule ;  Dct,  duct  of 
spermatheca ;  e,  f,  duct  of  spermatophore ;  g,  flower  bracts  adhering  to  spermato- 
phore ;  GC,  pocket  of  genital  chamber  receiving  spermathecal  duct ;  Ovp,  oviposi- 
tor ;  Sphr,  spermatophore ;  Spf,  spermatheca ;  VIIISL,  subgenital  lobe  of  eighth 
abdominal  sternum. 
a  brown  color.  According  to  Ito  (1924)  the  secretions  of  the  two 
sets  of  accessory  gland  tubules  differ  in  their  staining  reactions,  and 
the  outer  covering  of  the  spermatophore  shows  the  staining  properties 
of  the  secretion  of  the  larger  tubules.  Gerhardt  says  also  that  the 
secretion  taken  from  the  long  tubules  is  clearly  the  substance  of  the 
outer  spermatophore  covering.  The  relative  size  and  anterior  position 
of  the  larger  tubes  of  the  accessory  glands  (fig.  20  A,  a)  would  suggest 
that  these  tubes  furnish  the  more  abundant  material  and  the  last  to 
be  discharged.  The  capsular  substance  of  the  spermatophore,  there- 
fore, is  to  be  referred  to  the  smaller  tubules,  but  where  there  are 
