54 
SMITHSONIAN    MISCELLANEOUS    COLLECTIONS  VOL.    96 
as  above  noted,  they  lie  in  the  anterior  end  of  a  groove  (fig.  19  D,  sg) 
on  the  dorsal  surface  of  the  genital  lobe  (in)  that  contains  the  gono- 
pore  (C,  Gpr)  in  its  free  posterior  margin.  The  groove  of  the  genital 
lobe,  therefore,  is  clearly  a  sperm  conduit  serving  to  convey  the  sper- 
matozoa from  the  spermathecal  apertures  at  its  base  (D,  Spr,  Spr) 
to  the  eggs  issuing  from  the  gonopore  at  its  posterior  end  (C,  Gpr). 
The  ootheca  of  Blattella  is  molded  in  the  cavity  of  a  large  triangular, 
k     sg"  Gpr 
•J  -»s»=-  p'    r        n     h 
Sp 
vniT 
XT 
Fig.  19. — Blattoidea:  female  genitalia  and  associated  structures  of  Blattella 
gemmnica  (Linnaeus). 
A,  general  view  of  external  genitalia  and  associated  inner  structures  exposed 
by  removal  of  seventh  abdominal  sternum,  ventral  view.  B,  spermathecae.  C, 
genital  lobe  (m)  containing  gonopore  projecting  from  anterior  wall  of  genital 
chamber,  posterior  view.  D,  genital  lobe  (m),  and  oothecal  fold  {p,  q)  on  floor 
of  vestibulum. 
Gld,  spermathecal  gland;  Gpr,  gonopore;  h,  i,  j,  k,  sclerites  in  ventral  folds 
(VIII V)  of  eighth  abdominal  segment;  /,  transverse  sclerite  in  roof  of  genital 
chamber  proximal  to  ovipositor ;  m,  genital  lobe ;  n,  subgenital  fold ;  0,  0,  ven- 
tral arms  of  ninth  tergum ;  Ode,  oviductus  communis ;  Odl,  oviductus  lateralis ; 
Ovp,  ovipositor ;  p,  oothecal  fold  on  dorsal  surface  of  seventh  sternum ;  Papt, 
paraproct ;  q,  q,  lateral  flaps  of  oothecal  fold ;  r,  median  anterior  sclerite  in  floor 
of  oothecal  chamber ;  s,  foramen  admitting  end  of  ovipositor  into  oothecal  cham- 
ber; sg,  spermatic  groove;  Sp,  spiracle;  Spr,  spermathecal  aperture;  Spt,  sper- 
matheca ;  VIIS,  sternum  of  seventh  segment;  VIII V,  venter  of  eighth  seg- 
ment; VIIIT,  tergum  of  eighth  segment;  x-x,  cut  edge  of  anterior  wall  of 
genital  chamber;  XT,  tergum  of  tenth  segment. 
calyxlike  fold  (fig.  19  D,  p,  q)  arising  submarginally  on  the  floor  of 
the  vestibulum.  The  apex  of  this  fold  (C,  p)  lies  anteriorly  beneath 
the  subgenital  fold  (n)  of  the  eighth  segment,  and  encloses  a  small 
median  sclerite  (r)  of  the  vestibular  floor.  The  lateral  parts  of  the 
oothecal  fold  are  produced  in  two  broad  irregular  flaps  (D,  q,  q), 
Vi^hich  overlap  medially,  but  leave  between  their  bases  a  round  foramen 
(s),  through  which  the  end  of  the  ovipositor  projects  posteriorly  and 
downward  into  the  oothecal  chamber.   The  genital  lobe  of  the  eighth 
