NO.    5      MALE  GENITALIA  OF  ORTHOPTEROID  INSECTS SNODGRASS        89 
rod  of  Gryllus  and  Gryllodes  that  guides  the  end  of  the  sperniatophore 
duct.  The  lobe  is  set  somewhat  back  from  the  extremity  of  the 
epiphallus  (F,  v) ,  and  in  its  base  dorsally  is  a  transverse  sclerite 
(E,  F,  aa),  from  which  a  pair  of  apodemal  arms  (E,  bb)  projects  into 
the  body  cavity  above  the  wall  of  the  dorsal  phallic  cavity.   The  inner 
Fig.  36. — Tettigonioidea-Gryllidae :  external  genitalia  of  Nonobius  jasciatus 
(Degeer). 
A,  end  of  abdomen,  posterior  view.  B,  epiphallus,  or  exposed  dorsal  wall  of 
dorsal  lobe  of  phallus,  dorsal  view.  C,  phallus,  ventral  view,  showing  dorsal 
cavity  {dc)  open  ventrally  beyond  ventral  lobe  (vl) .  D,  ventral  lobe  of  phal- 
lus, posterior  view,  showing  inflected  margins.  E,  distal  part  of  dorsal  wall  of 
dorsal  cavity  of  phallus,  and  free  guide  lobe  {v)  for  spermatophore  duct,  dorsal 
view.  F,  diagrammatic  median  section  of  phallus,  base  of  paraproct  (Papt) , 
and  ninth  abdominal  sternum  (IXS). 
For  letter  explanation,  see  fig.  30. 
ends  of  the  apodemes  are  connected  by  a  broad  sheet  of  muscle  fibers 
(6),  and  on  each  apodeme  is  inserted  laterally  a  strong  muscle  (2) 
from  the  lateral  sclerites  of  the  epiphallus.  The  apodemes  and  the 
supporting  plate,  therefore,  must  represent  the  sclerite  of  the  wall  of 
the  dorsal  sac  in  Gryllus  and  Gryllodes.  Beneath  the  apodemes  and 
their  muscles  are  the  usual  transverse  muscles  (/)  of  the  wall  of  the 
dorsal  cavity. 
