389 
Both  of  these  are  unknown  to  me  ;  but  the  characters  given  by  Brandt 
are  sufficient  to  show  that  they  belong  to  two  distinct  sections  of  the 
group  Spirobolus.  In  fact  it  is  highly  probable  that  olfersii  is  referable 
to  the  section  that  Karsch  has  called  Rhinocricus;  consequently  for 
bungii  and  its  allies  we  may  retain  the  name  Spirobolus.  Now  a  Chi- 
nese species  known  to  me  and  evidently  a  very  near  ally  of  bungii 
belongs  to  a  type  which  is  very  common  in  Mexico  and  some  of  the 
Southern  States  of  N.  America.  Probably  Sp.  americae-borealis  (Beau- 
vois)  ==  marginatus  (Say)  is  one  of  the  best  known  examples  of  this 
group.  At  all  events  I  propose  to  restrict  the  name  Spirobolus  to 
this  perfectly  natural  assemblage  of  species. 
In  the  collection  of  Iulidse  obtained  by  Dr.  Max  Weber  there  were  no 
representatives  of  Spirobolus ,  using  the  word  as  now  restricted  by  me  ; 
but  the  specimens  fall  readily  into  three  apparently  natural  sections, 
one  of  which  is  certainly  the  typical  Rhinocricus  of  Karsch ,  which  I 
have  attempted  more  accurately  to  define.  The  second  section  is  nearly 
allied  to  Rhinocricus  and  it  may  be  no  easy  task  in  every  case  to 
distinguish  the  two.  But  there  is  no  doubt  that  it  contains  a  large 
number  of  Oriental  species  which  are  recognisable  at  a  glance  as  be- 
longing to  it.  I  select  Sp.  goësi,  Porat  as  the  type  of  this  group 
which  may  be  called  Trigoniulus.  The  3**  section  which  also  contains 
a  large  number  of  Oriental  forms,  I  propose  to  term  Spirobolellus , 
selecting  as  the  type  the  species  here  named  chrysodirus.  To  define 
accurately  the  limits  of  these  three  groups  would  entail  the  exami- 
nation of  an  enormous  amount  of  material  and  the  expenditure  of  a 
great  deal  of  time.  I  have  consequently  in  this  paper  confined  myself 
to  pointing  out  some  of  the  easily  ascertained  features  of  each. 
Synopsis  of  the  species  and  genera. 
a.  Labral  punctures  2  +  2  :  pores  distinctly  in  front  of  the  sulcus  ; 
1st  segment  smaller  laterally  ;  colour  uniform  or  transversely  banded. 
a\  1st  segment  short  and  widely  rounded  laterally,  not  extending 
inferiorly  nearly  so  low  as  the  2nd  ;  scobina  present.  Rhinocricus 
a2.  With  an  acute  tail  projecting  beyond  the  anal  valves,  (of 
large  size,  stout,  sulcus  incomplete  dorsally,  the  anterior 
dorsal  area  finely  striate  transversely)   .  weben. 
b\  Anal  tergite  not  projecting  beyond  the  valves. 
a3.  Of  small  size,  stout,  legs  shorter,  segments  almost  smooth 
