XO.    5      MALE  GENITALIA  OF  ORTHOPTEROID  IXSECTS SNODGRASS         I3 
lum  of  the  ejaculatory  duct  receiving  a  pair  of  united  tubes,  which 
are  probably  accessory  glands.  Hence  it  is  evident  that  the  Isoptera 
may  have  both  accessory  glands  and  seminal  vesicles  arising  from  the 
vasa  deferentia,  or  from  their  conjoined  ends  united  with  the  ejacula- 
-Tes 
Spt      AcGlds      Rect 
Papt  ^\  i/v^      .. — 
'sty 
Od  viiis  GC  ixs  vns 
Fig.  3. — Isoptera  :    male  and  female  genitalia. 
A,  Archotermopsis  wroughtoni  (Desneux),  internal  male  reproductive  or- 
gans of  an  adult  soldier  (from  Imms,  1920).  B,  Odoiitote?-iiics  obscuriceps 
(Wasmann),  internal  reproductive  organs  of  a  king  (from  Bugnion  and  Popoff, 
1912).  C,  Retlculitermes  lucifiigiis  Rossi,  internal  reproductive  organs  of  a 
perfect  male  before  loss  of  wings  (from  Grassi  and  Sandias,  1897).  D,  same, 
testis  of  perfect  insect  before  loss  of  wrings  (from  Grassi  and  Sandias,  1897). 
E,  Mastaternues  darzviiiciisis  Froggatt,  end  of  abdomen  of  winged  male  (from 
Crampton,  1920).  F,  Archotcnnopsis  zifroitghio)ii  (Desneux),  diagrammatic 
median  section  of  posterior  part  of  abdomen  of  female  soldier  (from  Imms, 
1920).    G,  same,  accessory  genital  glands  of  female  soldier  (from  Imms,  1920). 
AcGId,  accessory  gland;  Dej,  ductus  ejaculatorius;  GC,  genital  chamber; 
Od,  oviduct ;  Papt,  paraproct ;  Rcct.  rectum  ;  Spt,  spermatheca ;  Sty,  stylus  ;  Tes, 
testis  ;  Vd,  vas  deferens. 
tory  duct.  A  phallic  ("  prostate  ")  gland,  such  as  that  present  in  Blat- 
tidae  and  Mantidae,  lias  not  been  observed  in  the  Isoptera. 
The  ovaries  of  Isoptera  have  the  generalized  type  of  structure  that 
occurs  also  in  some  Orthoptera,  in  which  the  ovarioles  arise  serially 
from  the  distal  parts  of  the  lateral  oviducts.  The  terminal  filaments 
unite  in  a  common  median  suspensory  ligament.  The  accessory  genital 
