l8  SMITHSONIAN    MISCELLANEOUS    COLLECTIONS  VOL.   96 
Imms  (1934)  associates  the  Zoraptera  with  the  Psocida  in  a  common 
order  Psocoptera.  Crampton  (1922)  points  out  a  similarity  in  the 
wing  venation  between  Archipsocus  and  Zorotypus,  but  in  an  earlier 
paper  (1920a)  he  regarded  the  Zoraptera  as  intermediate  between 
Plecoptera  and  Isoptera,  with  perhaps  closer  affinities  on  the  side  of 
the  Isoptera. 
The  general  outlines  of  the  body  of  a  wingless  Zorotypus  hub- 
bardi  (fig.  5  A)  suggest  those  of  a  newly  hatched  cockroach,  and 
the  aspect  of  the  insect  as  a  whole,  especially  when  seen  in  side  view. 
rPhm 
C        VIIIS 
Fig.  5. — Zoraptera:    Zorotypus  hubbardi  Caudell. 
D 
A,  wingless  adult  (X  33)-  B,  head,  anterior  view,  showing  orthopteroid 
type  of  structure  in  frons,  clypeus,  and  labrum.  C,  posterior  end  of  male  abdo- 
men.   D,  male  genital  lobes. 
at,  anterior  tentorial  pit ;  ant,  anal  tube ;  Clp,  clypeus ;  es,  epistomal  suture ; 
Fr,  frons;  Liii,  labrum;  IPhm,  left  phallomere;  rPhm,  right  phallomere. 
has  a  rather  striking  resemblance  to  that  of  a  grylloblattid.  The 
features  of  the  head  of  Zorotypus,  except  for  the  specialized  form  of 
the  antennae  and  palpi,  and  the  absence  of  parietal  sutures,  are  those 
of  Grylloblatta,  and  have  no  likeness  to  the  head  characters  of 
Psocidae.  There  is.  for  example,  no  upward  enlargement  of  the 
postclypeus,  a  prominent  characteristic  of  the  psocid  head,  and  the 
maxillary  rods  of  the  psocids  are  absent  in  Zorotypus.  The  only  well- 
marked  head  suture  in  Zorotypus  hubbardi  is  the  epistomal  suture 
(fig.  5  B,  es)  ;  it  cuts  straight  across  the  lower  edge  of  the  face  below 
the  antennal  bases,  and  contains  laterally  the  tentorial  pits  (at).  Be- 
yond the  epistomal   suture,   as   shown  by  Crampton,  is  a  narrow 
