﻿498 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol.98 
  

  

  Pronotum 
  low; 
  lateral 
  extensions 
  knoblike; 
  metopidium 
  smooth; 
  

   humerals 
  slightly 
  produced, 
  obtuse; 
  posterior 
  process 
  elongate, 
  acute 
  

   apically. 
  Elytra 
  with 
  five 
  apical 
  cells; 
  venation 
  distinct, 
  veins 
  on 
  

   corium 
  separated 
  at 
  base. 
  Lateral 
  valves 
  without 
  teeth, 
  usually 
  

   narrow, 
  elongate. 
  Sternal 
  plate 
  with 
  deep, 
  broad, 
  apical 
  notch. 
  

   Apices 
  of 
  styles 
  acute, 
  strongly 
  recurved 
  dorsally 
  and 
  laterally. 
  

   Aedeagus 
  short, 
  with 
  posterior 
  arm 
  much 
  larger 
  than 
  anterior, 
  with 
  

   its 
  anterior 
  surface 
  minutely 
  dentate. 
  

  

  Type 
  of 
  the 
  genus, 
  Acutalis 
  Jusconervosa 
  Fairmaire 
  (1846, 
  p. 
  498), 
  

   a 
  tropical 
  species 
  described 
  from 
  Colombia 
  and 
  occurring 
  northward 
  

   into 
  Mexico. 
  In 
  the 
  North 
  American 
  fauna 
  only 
  two 
  species 
  are 
  

   structurally 
  distinct 
  and 
  the 
  other 
  forms 
  are 
  believed 
  to 
  be 
  color 
  

   variations. 
  The 
  North 
  American 
  forms 
  are 
  listed 
  : 
  

  

  fusconervosa 
  Fairmaire, 
  1846 
  

   tartar 
  ea 
  (Say, 
  1830) 
  

  

  var. 
  inornata 
  Ball, 
  1905 
  

  

  var. 
  nigrinervis 
  Fowler, 
  1895 
  

  

  var. 
  semicrema 
  (Say, 
  1830) 
  

  

  Genus 
  MICRUTALIS 
  Fowler 
  

  

  Plate 
  18, 
  Figure 
  2 
  

   Micrutalis 
  Fowler, 
  1895, 
  p. 
  116. 
  

  

  Probably 
  distantly 
  related 
  to 
  Acutalis 
  Fairmaire 
  but 
  more 
  closely 
  

   related 
  to 
  Brachytalis 
  Metcalf 
  and 
  Bruner. 
  Distinguished 
  from 
  either 
  

   genus 
  by 
  the 
  obscure 
  venation 
  of 
  the 
  elytra 
  and 
  the 
  angular 
  form 
  of 
  the 
  

   styles 
  and 
  aedeagus. 
  

  

  Pronotum 
  low; 
  lateral 
  extensions 
  thin, 
  platelike; 
  metopidium 
  

   smooth, 
  very 
  broadly 
  rounded; 
  suprahumerals 
  smooth; 
  humerals 
  

   produced, 
  obtuse; 
  posterior 
  process 
  short, 
  not 
  constricted 
  before 
  

   obtuse 
  apex. 
  Elytra 
  \vith 
  three 
  or 
  four 
  apical 
  cells; 
  venation 
  obscure, 
  

   veins 
  on 
  corium 
  separated 
  at 
  base. 
  Lateral 
  valves 
  almost 
  as 
  large 
  or 
  

   larger 
  than 
  pygofer, 
  without 
  teeth. 
  Sternal 
  plate 
  deeply 
  slit 
  apically. 
  

   Apices 
  of 
  styles 
  abruptly 
  directed 
  dorsad; 
  barbed 
  on 
  anterior 
  margin. 
  

   Aedeagus 
  with 
  arms 
  subsequal 
  in 
  size, 
  angulate 
  in 
  lateral 
  aspect; 
  

   posterior 
  arm 
  with 
  anterior 
  and 
  posterior 
  margins 
  parallel, 
  posterior 
  

   margin 
  perpendicular 
  to 
  ventral 
  margin, 
  in 
  lateral 
  aspect. 
  

  

  Type 
  of 
  the 
  genus, 
  Tragopa 
  ephippium 
  Burmeister 
  (1836, 
  p. 
  191), 
  a 
  

   Neotropical 
  species. 
  Most 
  of 
  the 
  species 
  in 
  this 
  genus 
  are 
  small 
  and 
  

   lack 
  morphological 
  characters 
  that 
  may 
  be 
  used 
  to 
  distinguish 
  one 
  

   from 
  another; 
  however, 
  in 
  a 
  few 
  forms 
  color 
  characters 
  seem 
  to 
  be 
  

   consistent. 
  These 
  forms 
  have 
  been 
  given 
  varietal 
  rank. 
  The 
  forms 
  

   occurring 
  within 
  the 
  United 
  States 
  are 
  listed 
  below: 
  

  

  calva 
  (Say, 
  1830) 
  

  

  var. 
  occidentalis 
  Coding, 
  1894 
  

  

  var. 
  parva 
  Coding, 
  1894 
  

   dor 
  salts 
  (Fitch, 
  1851) 
  

  

  