34  SMITHSONIAN    MISCELLANEOUS    COLLECTIONS  VOL.    96 
comparative  anatomy  lies  in  the  fact  that  it  has  httle  in  common  with 
the  phalhc  musculature  of  Blattidae.  Aside  from  several  sheets  of 
muscle  fibers  inserted  dorsally  at  the  base  of  the  right  phallomere, 
which  appear  to  arise  on  the  tenth  segment,  the  muscles  of  the  three 
appendages  are  as  follows: 
I.  Retractor  of  the  ventral  phallomere  (fig.  lo  D). — A  short  thick 
muscle  arising  to  the  left  on  the  anterior  lobe  of  the  ninth  abdominal 
sternum  (IXS),  inserted  on  the  base  of  the  ventral  plate  of  the 
ventral  phallomere. 
-?.  Retractor  of  the  right  phallomere  (fig.  lO  B,  D). — A  corres- 
ponding but  much  longer  muscle  on  the  right  from  the  anterior  lobe 
of  the  ninth  sternum  to  the  base  of  the  apodeme  of  the  right  phallo- 
mere (B). 
J.  Levator  of  right  phallomere  (fig.  lo  B). — A  short  muscle  from 
the  base  of  the  apodemal  stalk  to  the  dorsal  margin  of  the  base  of 
the  right  phallomere. 
4,  5.  Depressors  of  the  right  phallomere  (fig.  loB). — Two  flat 
sheets  of  fibers  arising  on  the  distal  expansion  of  the  apodeme,  in- 
serted ventrally  on  the  base  of  the  right  phallomere. 
6.  Muscle  of  the  ventral  clasper  of  the  right  phalloniere  (fig.  lo  B, 
C). — A  broad  flat  muscle  arising  on  the  stalk  and  lobe  of  the  apodeme 
(B),  inserted  on  the  base  of  the  movable  ventral  hook  (C,  /)  of  the 
right  phallomere. 
7,  8,  p.  Intrinsic  muscles  of  the  right  phallomere  (fig.  loB). — 
Two  of  these  muscles  {y,  S)  are  divergent  bundles  of  fibers  on  the 
ventral  wall  of  the  right  phallomere,  the  third  (p)  is  a  lateral  series 
of  short  fibers  inserted  on  the  serrated  ridge  (C,  d)  of  the  ventral 
wall  of  the  phallomere. 
70.  A  short  muscle  (fig.  lo  R,  D)  from  the  mesal  extremity  of 
the  base  of  the  right  phallomere  (b)  to  the  mesal  apodeme  (D,  ^) 
of  the  left  phallomere. 
II.  An  intrinsic  muscle  of  the  left  phallomere  (fig.  lo  D)  extend- 
ing from  the  mesal  apodeme  of  the  latter  (k)  to  the  base  of  the 
apical  process  (g). 
12,  ij,  14,  15. — A  group  of  four  intrinsic  muscles  of  the  left  and 
ventral  phallomeres  (fig.  lo  D)  converging  upon  the  apodemal  process 
im)  of  the  ventral  wall  of  the  left  phallomere,  one  muscle  {12) 
from  the  anterior  end  of  the  ventral  plate  of  the  ventral  phallomere, 
another  (ij)  from  the  distal  lateral  angle  of  the  same  plate  (F,  75), 
the  third  (/./)  from  the  base  of  the  apical  process  {g),  and  the  fourth 
( r^)  from  the  mesal  plate  of  the  left  phallomere.  Muscles  12  and  13 
of  this  group  evidently  serve  to  move  the  left  and  ventral  phallomeres 
