﻿506 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol.98 
  

  

  curvata, 
  new 
  species 
  

  

  diceros 
  (Say, 
  1824), 
  new 
  combination 
  [Membracis, 
  Smilia, 
  Ceresa] 
  

  

  diminuta 
  Van 
  Duzee, 
  1908 
  

  

  lutea 
  (Walker, 
  1851) 
  

  

  rmlitaris 
  (Gibson 
  and 
  Wells, 
  1917), 
  new 
  combination 
  [Ceresa] 
  

  

  palmeri 
  (Van 
  Duzee, 
  1908), 
  new 
  combination 
  [Ceresa] 
  

  

  stimulea 
  (Van 
  Duzee, 
  1909), 
  new 
  combination 
  [Ceresa] 
  

  

  substriata 
  (Walker, 
  1851) 
  

  

  taurina 
  (Fitch, 
  1856), 
  new 
  combination 
  [Membracis, 
  Enchenopa, 
  Ceresa] 
  

  

  illinoiensis 
  (Coding, 
  1894), 
  new 
  synonymy 
  [Ceresa] 
  

   tauriniformis, 
  new 
  species 
  

  

  TORTISTILUS, 
  new 
  genus 
  

  

  Plate 
  18, 
  Figure 
  6 
  

  

  In 
  general 
  resembling 
  Stictocephala 
  StA,l 
  but 
  differentiated 
  by 
  having 
  

   the 
  metopidium 
  more 
  vertical 
  and 
  by 
  having 
  the 
  styles 
  of 
  the 
  males 
  

   more 
  flattened 
  with 
  their 
  apices 
  truncate 
  or 
  strongly 
  convergent. 
  

  

  Suprahumerals 
  usually 
  prominent 
  but 
  usually 
  unarmed. 
  Meto- 
  

   pidium 
  almost 
  vertical; 
  the 
  sides 
  meeting 
  before 
  the 
  middle 
  of 
  the 
  

   body. 
  Lateral 
  valves 
  with 
  teeth; 
  teeth 
  shorter 
  than 
  -svidth 
  of 
  valves. 
  

   Male 
  styles 
  flattened 
  in 
  apical 
  half, 
  S-shaped; 
  apices 
  obliquely 
  truncate 
  

   or 
  convergent. 
  Aedeagus 
  with 
  functional 
  orifice 
  long, 
  narrow, 
  sub- 
  

   apical; 
  apex 
  of 
  posterior 
  arm 
  acuminate, 
  needlelike 
  in 
  lateral 
  aspect, 
  

   appearing 
  slightly 
  flattened 
  in 
  caudal 
  aspect. 
  

  

  Type 
  of 
  the 
  genus, 
  Membracis 
  goniphora 
  Say 
  (1830, 
  p. 
  243), 
  known 
  

   to 
  occur 
  over 
  the 
  northern 
  section 
  of 
  the 
  United 
  States. 
  The 
  selection 
  

   of 
  goniphora, 
  which 
  is 
  a 
  synonym 
  of 
  inermis 
  Fabricius, 
  for 
  type 
  may 
  

   be 
  an 
  unusual 
  procedure, 
  but 
  it 
  is 
  believed 
  to 
  be 
  the 
  more 
  logical 
  

   choice 
  since 
  it 
  is 
  known 
  that 
  Say's 
  material 
  came 
  from 
  the 
  IVIissouri 
  

   region 
  while 
  it 
  is 
  only 
  problematical 
  that 
  the 
  Fabrician 
  material 
  may 
  

   have 
  come 
  from 
  northern 
  North 
  America. 
  Furthermore, 
  goniphora 
  

   Say 
  is 
  the 
  only 
  large 
  ceresine 
  lacking 
  suprahumeral 
  horns 
  other 
  than 
  

   Membracis 
  festina 
  Say 
  recorded 
  from 
  the 
  Missouri 
  region, 
  so 
  it 
  is 
  

   reasonably 
  certain 
  that 
  the 
  specific 
  identification 
  of 
  goniphora 
  is 
  

   correct 
  even 
  though 
  its 
  type 
  is 
  destroyed. 
  In 
  order 
  to 
  have 
  a 
  specimen 
  

   upon 
  which 
  to 
  base 
  the 
  specific 
  concept 
  of 
  goniphora 
  and 
  the 
  generic 
  

   concept 
  of 
  Tortistilus 
  it 
  becomes 
  necessary 
  to 
  designate 
  a 
  neotype 
  

   for 
  Membracis 
  goniphora 
  Say, 
  

  

  TORTISTILUS 
  INERMIS 
  (Fabricius). 
  new 
  combination 
  

  

  Membracis 
  inermis 
  Fabricius, 
  1775, 
  p. 
  677. 
  

   Membracis 
  goniphora 
  Say, 
  1830, 
  p. 
  243. 
  

  

  Length 
  8.5 
  mm., 
  greatest 
  width 
  3.4 
  mm. 
  General 
  color 
  of 
  dried 
  

  

  specimen 
  dark 
  yellow 
  washed 
  with 
  green 
  along 
  suprahumerals 
  and 
  

  

  dorsal 
  crest; 
  lateral 
  areas 
  of 
  pronotum 
  spotted 
  with 
  white. 
  Femora 
  

  

  with 
  dense 
  black 
  subapical 
  areas; 
  tibiae 
  and 
  tarsi 
  hghtly 
  fumate. 
  

  

  