﻿REVISION 
  OF 
  TRIBE 
  CERESINI 
  — 
  CALDWELL 
  501 
  

  

  apex 
  of 
  posterior 
  arm 
  acuminate 
  in 
  lateral 
  aspect, 
  appearing 
  flattened 
  

   in 
  caudal 
  aspect. 
  

  

  Type 
  of 
  the 
  genus, 
  Thelia 
  lutea 
  Walker 
  (1851), 
  from 
  North 
  America, 
  

   Because 
  the 
  Walker 
  specimens 
  are 
  cotype 
  material 
  it 
  is 
  desirable 
  to 
  

   designate 
  one 
  specimen 
  as 
  type. 
  Funkhouser 
  (1923, 
  p. 
  113), 
  in 
  

   referring 
  to 
  the 
  figure 
  of 
  lutea 
  drawn 
  by 
  Knight, 
  made 
  the 
  following 
  

   statement: 
  "We 
  should 
  consider 
  the 
  form 
  as 
  figured 
  by 
  Mr. 
  Knight 
  

   as 
  typical." 
  It 
  is 
  believed 
  that 
  this 
  statement 
  cannot 
  be 
  rigidly 
  

   construed 
  as 
  type 
  fixation, 
  and 
  furthermore, 
  it 
  is 
  uncertain 
  which 
  of 
  

   Walker's 
  specimens 
  was 
  figured; 
  however, 
  according 
  to 
  W. 
  E. 
  China,' 
  

   it 
  is 
  believed 
  to 
  be 
  specimen 
  "a" 
  (Walker, 
  1851, 
  p. 
  560), 
  which 
  is 
  a 
  

   female. 
  I 
  believe 
  the 
  specimen 
  figured 
  by 
  Knight 
  to 
  hefestina 
  (Say), 
  

   because 
  a 
  proportionate 
  drawing 
  of 
  festina 
  superimposed 
  over 
  the 
  

   illustration 
  by 
  Knight 
  is 
  too 
  nearly 
  perfect 
  for 
  the 
  two 
  not 
  to 
  be 
  the 
  

   same 
  species. 
  If 
  this 
  belief 
  is 
  true 
  then 
  Wallcer's 
  original 
  description 
  

   of 
  lutea 
  cannot 
  be 
  based 
  on 
  specimen 
  "a," 
  as 
  the 
  colors 
  mentioned 
  in 
  

   the 
  description 
  do 
  not 
  occur 
  in 
  Jestina. 
  W. 
  E. 
  China 
  has 
  stated 
  fur- 
  

   ther 
  that 
  specimen 
  "c," 
  a 
  male, 
  bears 
  a 
  type 
  label 
  (labeled 
  before 
  his 
  

   time) 
  and 
  is 
  conspecific 
  with 
  specimen 
  "b," 
  which 
  is 
  also 
  a 
  male. 
  In 
  

   order 
  to 
  validate 
  the 
  labeled 
  type 
  of 
  the 
  Walker 
  material 
  I 
  hereby 
  

   designate 
  specimen 
  "c" 
  as 
  lectotype 
  male 
  of 
  Thelia 
  lutea 
  Walker. 
  

  

  With 
  few 
  exceptions 
  the 
  majority 
  of 
  the 
  species 
  occurring 
  in 
  the 
  

   Nearctic 
  that 
  were 
  included 
  in 
  Ceresa 
  wiU 
  now 
  be 
  included 
  in 
  Sticto- 
  

   cephala. 
  As 
  far 
  as 
  known 
  the 
  genus 
  is 
  limited 
  in 
  its 
  distribution 
  to 
  the 
  

   Nearctic 
  region 
  of 
  North 
  America 
  and 
  undoubtedly 
  occurs 
  in 
  northern 
  

   Mexico 
  and 
  in 
  the 
  higher 
  elevations 
  farther 
  south, 
  but 
  there 
  are 
  no 
  

   records 
  of 
  any 
  species 
  from 
  Mexico. 
  The 
  life 
  histories 
  and 
  partial 
  

   biologies 
  worked 
  out 
  for 
  a 
  few 
  forms 
  would 
  indicate 
  that 
  oviposition 
  

   occurs 
  on 
  woody 
  plants 
  and 
  that 
  the 
  development 
  of 
  the 
  immatures 
  

   occurs 
  on 
  succulent 
  herbaceous 
  vegetation. 
  

  

  Stidocephala 
  is 
  closely 
  related 
  to 
  Tortistilus 
  through 
  lutea, 
  substriata, 
  

   and 
  diminuta 
  which 
  resemble 
  the 
  forms 
  of 
  Tortistilus 
  that 
  occur 
  on 
  

   cypress. 
  S. 
  ahnorma 
  and 
  S. 
  curvata 
  also 
  have 
  styles 
  that 
  are 
  sugges- 
  

   tive 
  of 
  those 
  possessed 
  by 
  species 
  of 
  Tortistilus. 
  

  

  In 
  general, 
  the 
  male 
  genitaha 
  of 
  the 
  species 
  appear 
  to 
  be 
  well 
  

   defined 
  and 
  subject 
  to 
  little 
  variation. 
  The 
  style 
  type 
  associated 
  with 
  

   the 
  species 
  of 
  this 
  genus 
  is 
  simplified 
  and 
  tubular 
  in 
  form, 
  and 
  the 
  

   differences 
  between 
  many 
  forms 
  are 
  not 
  outstanding; 
  however, 
  by 
  

   making 
  use 
  of 
  the 
  prominent 
  characters 
  displayed 
  by 
  the 
  body 
  in 
  

   general 
  and 
  the 
  thorax, 
  such 
  as 
  color 
  and 
  development 
  of 
  the 
  supra- 
  

   humerals, 
  supplemented 
  by 
  characters 
  found 
  in 
  the 
  genitalia, 
  the 
  forms 
  

   can 
  be 
  differentiated 
  without 
  too 
  much 
  difiSculty. 
  

  

  S. 
  diceros 
  and 
  S. 
  albescens 
  are 
  differentiated 
  from 
  the 
  other 
  forms 
  

  

  3 
  In 
  correspondence. 
  

  

  