20  SMITHSONIAN    MISCELLANEOUS    COLLECTIONS  VOL.    96 
group  that  is  uncertain.  Crampton  -(1927),  after  several  changes 
of  opinion,  finally  settled  to  the  conviction  that  the  Grylloblattidae  are 
related  to  the  Tettigoniidae  and  Gryllidae,  while  Imms  (1927)  con- 
tended that  the  weight  of  evidence  justifies  their  retention  in  the 
Cursoria,  with  which  they  were  first  associated.  From  a  study  of  the 
general  body  musculature  Ford  (1923)  concluded  that  Gryllohlatta 
belongs  to  the  blattid  and  mantid  line  of  descent  rather  than  to  that 
of  the  saltatorial  Orthoptera,  though  she  showed  that  the  muscula- 
ture of  the  ovipositor  is  much  like  that  of  Tettigoniidae  and  Gryllidae. 
Walker  (1933),  however,  finds  that  the  musculature  of  the  head  and 
head  appendages  of  Gryllohlatta  is  also  nearest  that  of  the  Saltatoria. 
The  structure  of  the  external  male  genitalia,  on  the  other  hand,  clearly 
suggests  a  relationship  with  the  mantids  and  blattids,  while  the  in- 
ternal genital  organs,  as  here  shown  from  sketches  by  Walker,  undoubt- 
edly present  a  very  generalized  type  of  orthopteroid  structure. 
The  following  brief  description  of  the  external  and  internal  genitalia 
of  Gryllohlatta  campodeiformis  is  to  be  accredited  entirely  to 
Dr.  E.  M.  Walker,  who  has  most  generously  sent  the  writer  notes 
and  sketches  from  his  as  yet  unfinished  work  on  the  anatomy  of  the 
species. 
The  most  evident  generalized  feature  of  the  grylloblattids  is  the 
entire  lack  of  union  between  the  sternum  and  the  appendages  of  the 
ninth  abdominal  segment  of  the  male  (fig.  6  A,  B,  C).  This  character 
is  unique  among  the  Orthoptera,  though  common  in  Thysanura  and 
Ephemeroptera  on  the  one  hand,  and  in  many  holometabolous  insects 
on  the  other.  The  genital  coxopodites  of  the  adult  are  large,  free, 
triangular  plates,  asymmetrical  in  size  and  shape  (B,  C,  Cxpd),  each 
bearing  a  small  apical  stylus  {Sty).  The  asymmetry  of  the  coxopodites 
is  less  pronounced  in  younger  instars  (A).  Though  both  coxopodites 
are  freely  hinged  on  the  ninth  sternum,  only  the  right  one.  Walker 
says,  is  provided  with  a  muscle,  which  arises  on  the  ninth  tergum. 
Neither  stylus,  however,  is  musculated. 
The  narrow  tenth  tergum  is  continued  ventrally  on  the  sides  around 
the  bases  of  the  cerci  into  a  pair  of  free  asymmetrical  processes 
(fig.  6  D)  that  nearly  meet  beneath  the  venter.  The  left  tergal  process 
{tpl)  is  a  sclerotic  arm  terminating  in  a  flattened  disk;  the  right 
process  {tpr)  is  of  simpler  form  and  is  unsclerotized  except  at  its 
base.  The  epiproct  (Eppt)  is  small,  entirely  free  from  the  tenth 
tergum,  but  concealed  beneath  the  margin  of  the  latter. 
The  external  male  genitalia  of  Gryllohlatta  consist  essentially  of 
two  phallic  lobes  (phallomeres)  arising  from  the  genital  surface, 
with  the  gonopore  between  them,  or  on  the  base  of  the  right  lobe. 
