﻿518 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol.98 
  

  

  Centrali-Americana 
  material 
  determined 
  by 
  Fowler, 
  and 
  one 
  specimen 
  

   determined 
  by 
  Signoret. 
  It 
  would 
  seem 
  that 
  either 
  testaceus 
  (Fair- 
  

   maire) 
  is 
  unknown, 
  that 
  mcca 
  is 
  a 
  synonym 
  of 
  ^estocews, 
  or 
  that 
  mexicanus 
  

   (Plummer) 
  is 
  a 
  synonym 
  of 
  vacca, 
  but 
  without 
  examination 
  of 
  all 
  the 
  

   types 
  it 
  is 
  impossible 
  to 
  settle 
  this 
  problem. 
  It 
  is 
  best, 
  therefore, 
  that 
  

   the 
  species 
  be 
  retained 
  as 
  valid 
  for 
  the 
  present. 
  

  

  The 
  styles, 
  though 
  much 
  reduced 
  in 
  size 
  in 
  this 
  genus, 
  still 
  retain 
  

   good 
  specific 
  characters 
  which 
  are 
  best 
  diagnosed 
  by 
  reference 
  to 
  the 
  

   illustrations. 
  (PI. 
  19, 
  fig. 
  10; 
  pi. 
  23.) 
  

  

  The 
  forms 
  known 
  to 
  belong 
  to 
  this 
  genus 
  are 
  listed. 
  

  

  ancora 
  (Ball, 
  1937), 
  new 
  combination 
  [Ceresa] 
  

   curvicornis 
  (Funkhouser, 
  1942), 
  new 
  combination 
  [Ceresa] 
  

   mexicanus 
  (Plummer, 
  1935), 
  new 
  combination 
  [Ceresa] 
  

   nigroviltaius 
  (Fowler, 
  1895), 
  new 
  combination 
  [Ceresa] 
  

   testaceus 
  (Fairmaire, 
  1846), 
  new 
  combination 
  [Ceresa] 
  

   vacca 
  (Fowler, 
  1895), 
  new 
  combination 
  [Ceresa] 
  

   variabilis 
  (Fowler, 
  1895), 
  new 
  combination 
  [Ceresa] 
  

  

  TRICHAETIPYGA, 
  new 
  genus 
  

  

  Plate 
  19, 
  Figure 
  9 
  

  

  K 
  elated 
  to 
  Stictolobus 
  Metcalf 
  with 
  which 
  it 
  agrees 
  in 
  the 
  small 
  size 
  

   and 
  slender 
  form 
  but 
  differs 
  in 
  the 
  tripartite 
  aedeagus. 
  

  

  Pronotum 
  high, 
  suprahumerals 
  usually 
  prominent 
  and 
  often 
  

   developed 
  into 
  small 
  acute 
  horns. 
  Lateral 
  valves 
  reduced 
  to 
  small 
  

   membranous 
  areas 
  lacking 
  teeth. 
  Posterior 
  margin 
  of 
  pygofer 
  with 
  

   paired 
  processes 
  on 
  either 
  side; 
  a 
  very 
  short 
  process 
  on 
  the 
  apical 
  

   fourth 
  and 
  an 
  elongate 
  projection 
  at 
  about 
  the 
  center 
  of 
  the 
  posterior 
  

   margin. 
  Apical 
  portion 
  of 
  styles 
  vestigal. 
  Aedeagus 
  modified 
  to 
  

   form 
  three 
  arms 
  with 
  the 
  ventroposterior 
  arm 
  bifurcate 
  apicaUy, 
  

   bifurcate 
  processes 
  recurved 
  laterally; 
  central 
  arm 
  (or, 
  normally, 
  

   posterior 
  arm) 
  long, 
  slender, 
  sometimes 
  with 
  anteriorly 
  directed 
  apical 
  

   hook; 
  anterior 
  arm 
  short 
  and 
  broad 
  in 
  lateral 
  aspect, 
  sometimes 
  

   much 
  reduced 
  in 
  size. 
  

  

  Type 
  of 
  the 
  genus, 
  Stictolobus 
  juniperinus 
  Ball 
  (1937, 
  p. 
  481), 
  a 
  

   species 
  from 
  Arizona. 
  As 
  far 
  as 
  kno\\ai 
  only 
  two 
  other 
  described 
  

   species 
  belong 
  in 
  this 
  genus, 
  Ceresa 
  infantilis 
  Ball 
  (1937) 
  from 
  Guerrero, 
  

   Mexico, 
  and 
  Stictolobus 
  delongi 
  Plummer 
  (1943) 
  from 
  Morelos, 
  Mexico. 
  

   The 
  ventroposterior 
  arm 
  of 
  the 
  aedeagus 
  is 
  very 
  long 
  in 
  juniperina 
  

   and 
  extremely 
  short 
  in 
  delongi. 
  T. 
  infantalis 
  has 
  a 
  pair 
  of 
  anteriorly 
  

   directed 
  hooks 
  on 
  the 
  central 
  arm 
  of 
  the 
  aedeagus 
  (normal 
  anterior 
  

   arm) 
  which 
  the 
  other 
  two 
  species 
  lack. 
  

  

  The 
  known 
  forms 
  are 
  listed: 
  

  

  delongi 
  (Plummer, 
  1943), 
  new 
  combination 
  [Stictolobus] 
  

   infantalis 
  (Ball, 
  1937), 
  new 
  combination 
  [Ceresa] 
  

   juniperina 
  (Ball, 
  1937), 
  new 
  combination 
  [Stictolobus] 
  

  

  