NO.    5      MALE  GENITAr.IA  OF  ORTHOPTEROID  INSECTS — SNODGRASS        45 
the  phallomere;  ^,  a  long  flat  muscle,  probably  a  levator  of  the  phal- 
lomere,  from  the  apodemal  plate  to  the  dorsal  plate  (/)  of  the  free 
part  of  the  phallomere;  8,  a  thick  mass  of  fibers  in  the  right  lobe  (c), 
arising  on  the  basal  plate  (o),  and  inserted  on  the  distal  process 
(fig.  13  C,  k)  of  the  ventral  plate  (li)  of  the  phallomere. 
Fig.  14. — Blattoidea :  the  phallomeres  and  phallic  musculature  of  Blafia  oricn- 
talis  Linnaeus. 
A,  left  phallomere  (IPlim)  and  muscles,  phallic  gland  (PhGld),  ejaculatory 
duct  (Dcj),  and  anterior  lobes  of  ninth  abdominal  sternum  ([XS),  dorsal 
view.  B,  ventral  phallomere  (vPIim),  with  phallotreme  (Plitr)  on  its  base 
opening  from  endophallic  pouch  (Enph)  continuous  with  ejaculatory  duct,  dorsal 
view.  C,  right  phallomere  (rPlini)  with  muscles,  and  base  of  ninth  abdominal 
sternum,  dorsal  view. 
es.  sclerite  of  endophallic  wall ;  fd,  fold  containing  phallotreme ;  tc,  ventral 
plate  of  ventral  phallomere ;  x-x,  cut  edge  of  anterior  wall  of  genital  chamber. 
Other  lettering  as  on  fig.  13. 
7,  tergal  adductor  of  dorsal  lobe  of  right  phallomere ;  j",  j,  sternal  adductors 
of  right  phallomere ;  4,  sternal  protractor  of  same ;  5,  retractor  of  capsular 
sclerite  ;  6,  muscle  of  basal  plate  ;  7,  apodemal  adductor  of  dorsal  lobe  of  right 
phallomere ;  S,  dextral  abductor  of  same ;  0,  w,  sternal  retractors  of  left  phal- 
lomere ;  w  a,  branch  of  10  inserted  on  endophallic  sclerite ;  //,  sternal  protrac- 
tor of  left  phallomere ;  12,  inner  muscle  of  left  phallomere ;  13,  14,  internal 
mucles  of  left  phallomere  not  shown  in  figures;  15,  muscle  of  ventral  phallomere. 
(See  text,  pages  44-46.) 
The  muscles  of  the  left  phallomere  are  as  follows  :  g,  lo,  tw^o  large 
retractors  of  the  phallomere,  arising  right  and  left  on  the  anterior 
lobes  of  the  ninth  sternum  (fig.  14  A),  extending  into  the  basal  fora- 
men of  the  phallomere  (fig.  13  E),  where  the  right  is  inserted  dorsally 
and  the  left  ventrally ;  10  a,  a  few  fibers  from  10  inserted  on  the 
endophallic  sclerite  (fig.  14  B,  es)  ;  //,  a  protracter  of  the  phallomere 
