﻿500 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol.98 
  

  

  In 
  the 
  collection 
  of 
  the 
  U. 
  S. 
  National 
  Museum 
  are 
  specimens 
  deter- 
  

   mined 
  by 
  Funkhouser 
  and 
  Goding 
  as 
  vitulus 
  Fabricius 
  that 
  fit 
  the 
  

   meager 
  definition 
  of 
  that 
  species. 
  A 
  plcsiotype 
  male 
  has 
  been 
  selected 
  

   from 
  this 
  material 
  upon 
  which 
  is 
  based 
  the 
  specific 
  concept 
  of 
  vitulus 
  

   and 
  the 
  generic 
  concept 
  of 
  Ceresa. 
  The 
  generic 
  concept 
  of 
  Ceresa 
  

   has 
  been 
  further 
  fortified 
  by 
  a 
  study 
  of 
  other 
  forms 
  congeneric 
  

   with 
  vitulus. 
  

  

  Metopidium 
  vertical, 
  rounding 
  posteriorly, 
  slightly 
  transversely 
  

   rounded, 
  very 
  broad. 
  Suprahumerals 
  greatly 
  developed 
  into 
  long, 
  

   acute 
  horns, 
  somewhat 
  curved 
  posteriorly. 
  Pronotum 
  greatly 
  nar- 
  

   rowed 
  behind 
  humeral 
  angles; 
  sides 
  almost 
  vertical; 
  dorsal 
  ridge 
  very 
  

   acute, 
  posterior 
  process 
  elongate, 
  acute. 
  

  

  Sternal 
  plate 
  narrowed 
  in 
  apical 
  half. 
  Lateral 
  valves 
  with 
  apical 
  

   portions 
  produced 
  into 
  small 
  acute 
  teeth 
  in 
  addition 
  to 
  elongate 
  lateral 
  

   teeth. 
  Lateral 
  teeth 
  arising 
  near 
  centers 
  of 
  anterior 
  margins 
  of 
  valves, 
  

   curved 
  somewhat 
  dorsally. 
  Styles 
  thickened, 
  usually 
  elongate; 
  apices 
  

   variously 
  modified 
  accordmg 
  to 
  the 
  species, 
  usually 
  suddenly 
  nar- 
  

   rowed 
  near 
  apices. 
  Connective 
  between 
  styles 
  and 
  aedeagus 
  almost 
  

   as 
  long 
  as 
  aedeagus. 
  ("Style-aedeagus 
  connective" 
  of 
  Lawson, 
  1922, 
  

   p. 
  39.) 
  Aedeagus 
  with 
  arms 
  subequal 
  in 
  length; 
  posterior 
  arm 
  more 
  

   slender 
  than 
  anterior; 
  anterior 
  surface 
  of 
  posterior 
  arm 
  finely 
  and 
  

   densely 
  dentate; 
  opening 
  very 
  broad, 
  extending 
  almost 
  for 
  full 
  

   length 
  of 
  posterior 
  arm. 
  

  

  CERESA 
  VITULUS 
  (Fabricius) 
  

  

  Membracis 
  vitulus 
  Fabricius, 
  1775, 
  p. 
  677. 
  

  

  Approximately 
  10 
  mm. 
  in 
  total 
  length; 
  width 
  across 
  suprahumeral 
  

   horns 
  6 
  mm. 
  White, 
  arched, 
  lateral 
  stripes 
  present 
  on 
  sides 
  of 
  

   pronotum. 
  (These 
  stripes 
  are 
  more 
  prominent 
  on 
  some 
  specimens 
  

   than 
  others.) 
  Elytra 
  yellowish- 
  tinted. 
  Styles 
  of 
  male 
  with 
  sud- 
  

   denly 
  constricted 
  apices, 
  heavily 
  pilose, 
  strongly 
  convergent. 
  

  

  Male 
  plesiotype 
  from 
  Par^, 
  Brazil. 
  

  

  Genus 
  STICTOCEPHALA 
  Stal 
  

  

  Plate 
  18, 
  Figure 
  4 
  

  

  Stictocephala 
  Stal, 
  1869, 
  p. 
  24. 
  

  

  Resembling 
  Ceresa 
  in 
  general 
  appearance 
  but 
  apparently 
  not 
  closely 
  

   related. 
  Similar 
  to 
  Tortistilus, 
  new 
  genus, 
  in 
  the 
  form 
  of 
  the 
  aedeagus 
  

   but 
  lacking 
  the 
  flattened 
  convergent 
  styles 
  of 
  that 
  genus 
  and 
  possessing 
  

   a 
  pronotum 
  that 
  is 
  much 
  lower 
  anteriorly. 
  

  

  Suprahumerals 
  either 
  smooth 
  or 
  developed 
  into 
  horns. 
  Metopidium 
  

   sloped 
  or 
  curved 
  posteriorly. 
  Male 
  styles 
  in 
  apical 
  half 
  round 
  or 
  

   oval 
  in 
  cross 
  section, 
  sometimes 
  slightly 
  curved 
  dorsally, 
  acuminate 
  

   apically. 
  Aedeagus 
  with 
  functional 
  orifice 
  long, 
  narrow, 
  subapical; 
  

  

  