﻿REVISION 
  OF 
  TRIBE 
  CERESINI 
  — 
  CALDWELL 
  497 
  

  

  KEY 
  TO 
  THE 
  MALES 
  OF 
  THE 
  NEARCTIC 
  GENERA 
  OF 
  CERESINI 
  

  

  1. 
  Lateral 
  valves 
  and 
  pygofers 
  without 
  teeth; 
  apices 
  of 
  styles 
  strongly 
  recurved, 
  

  

  divergent 
  2 
  

  

  Lateral 
  valves 
  or 
  pygofers 
  with 
  teeth; 
  apices 
  of 
  styles 
  vestigial 
  or 
  normal; 
  if 
  

   normal 
  in 
  length 
  then 
  apices 
  are 
  straight, 
  convergent, 
  or 
  curved 
  dorsally. 
  _ 
  4 
  

  

  2. 
  Styles 
  with 
  apices 
  obliquely 
  truncate 
  or 
  barbed 
  Micrutalis 
  Fowler 
  

  

  Styles 
  with 
  apices 
  acuminate 
  3 
  

  

  3. 
  Aedeagus 
  with 
  minute 
  spines 
  on 
  anterior 
  surface 
  of 
  posterior 
  arm 
  present 
  for 
  

  

  full 
  length; 
  lateral 
  valves 
  without 
  tubercles 
  Acutalis 
  Fairmaire 
  

  

  Aedeagus 
  with 
  large 
  spines 
  at 
  apex 
  of 
  posterior 
  arm 
  on 
  anterior 
  surface; 
  lateral 
  

   valves 
  with 
  large 
  rounded 
  tubercles 
  Parantonae 
  Fowler 
  

  

  4. 
  Aedeagus 
  U-shaped, 
  anterior 
  and 
  posterior 
  arms 
  subequal 
  in 
  length 
  5 
  

  

  Aedeagus 
  trif 
  urcate 
  or 
  consisting 
  of 
  a 
  single 
  arm 
  10 
  

  

  5. 
  Styles 
  vestigial 
  on 
  apical 
  half; 
  teeth 
  of 
  lateral 
  valves 
  as 
  long 
  or 
  longer 
  than 
  

  

  length 
  of 
  valves 
  Vestistilus, 
  new 
  genus 
  

  

  Styles 
  normal 
  on 
  apical 
  half; 
  teeth 
  of 
  lateral 
  valves 
  shorter 
  than 
  length 
  of 
  

   valves, 
  usually 
  much 
  so 
  6 
  

  

  6. 
  Each 
  lateral 
  valve 
  with 
  two 
  teeth, 
  more 
  dorsally 
  placed 
  tooth 
  smaller 
  than 
  

  

  more 
  ventrally 
  placed 
  tooth 
  with 
  surface 
  of 
  valve 
  concave 
  between; 
  aedeagus 
  

   much 
  shorter 
  than 
  valves 
  or 
  styles, 
  posterior 
  arm 
  finely 
  dentate 
  on 
  anterior 
  

  

  surface 
  Ceresa 
  Amyot 
  and 
  Serville 
  

  

  Each 
  lateral 
  valve 
  with 
  one 
  tooth; 
  aedeagus 
  as 
  long 
  as 
  valves, 
  posterior 
  arm 
  

   not 
  dentate 
  on 
  anterior 
  surface 
  7 
  

  

  7. 
  Aedeagus 
  with 
  posterior 
  arm 
  simple, 
  broader 
  than 
  anterior 
  arm; 
  functional 
  

  

  orifice 
  extending 
  full 
  length 
  of 
  posterior 
  arm; 
  styles 
  usually 
  strongly 
  curved 
  

  

  dorsally 
  Anisostylus, 
  new 
  genus 
  

  

  Aedeagus 
  with 
  posterior 
  arm 
  more 
  slender 
  than 
  anterior; 
  if 
  arms 
  are 
  subequal 
  

   in 
  size 
  then 
  an 
  apical 
  flap 
  or 
  modification 
  thereof 
  is 
  present 
  on 
  posterior 
  

   arm 
  8 
  

  

  8. 
  Styles 
  broad, 
  flat, 
  slightly 
  lunate 
  on 
  apical 
  half; 
  apices 
  obtuse; 
  posterior 
  arm 
  

  

  of 
  aedeagus 
  with 
  apical 
  flap 
  or 
  modification 
  thereof. 
  .Spissistilus, 
  new 
  genus 
  

  

  Styles 
  long 
  and 
  acuminate 
  apically; 
  or 
  S-shaped 
  with 
  truncate 
  apices, 
  or 
  long 
  

  

  with 
  apices 
  convergent 
  9 
  

  

  9. 
  Styles 
  long 
  and 
  acuminate 
  apically; 
  teeth 
  on 
  lateral 
  valves 
  as 
  long 
  or 
  slightly 
  

  

  longer 
  than 
  width 
  of 
  valves 
  Stictocephala 
  St§,l 
  

  

  Styles 
  S-shaped 
  with 
  truncate 
  apices, 
  or 
  long 
  with 
  apices 
  convergent; 
  teeth 
  

  

  on 
  lateral 
  valves 
  shorter 
  than 
  width 
  of 
  valves 
  Tortiatilus, 
  new 
  genus 
  

  

  10. 
  Aedeagus 
  appearing 
  as 
  a 
  single 
  tube 
  or 
  with 
  anterior 
  arm 
  greatly 
  sup- 
  

   pressed 
  Stictolobus 
  Metcalf 
  

  

  Aedeagus 
  trifurcate; 
  ventroposterior 
  arm 
  bifid 
  Trichaetipyga, 
  new 
  genus 
  

  

  Genus 
  ACUTALIS 
  Fairmaire 
  

  

  Plate 
  18, 
  Figure 
  3 
  

   Acutalis 
  Fairmaire, 
  1846, 
  p. 
  496. 
  

  

  Similar 
  to 
  Micrutalis 
  Fowler 
  in 
  general 
  form 
  but 
  differing 
  from 
  that 
  

   genus 
  in 
  that 
  the 
  venation 
  of 
  the 
  elytra 
  is 
  distinct 
  and 
  five 
  apical 
  cells 
  

   are 
  present 
  instead 
  of 
  three 
  or 
  four. 
  The 
  styles 
  of 
  the 
  male 
  somewhat 
  

   resemble 
  those 
  in 
  Anisostylus, 
  new 
  genus, 
  but 
  the 
  lateral 
  valves 
  are 
  

   unarmed 
  and 
  the 
  aedeagus 
  is 
  of 
  a 
  more 
  compact 
  type. 
  In 
  general, 
  

   the 
  entire 
  genitalia 
  suggest 
  close 
  relationship 
  to 
  Euritia 
  StM 
  and 
  

   Thrasymedes 
  Kirkaldy, 
  which 
  are 
  tropical 
  genera. 
  

  

  