﻿514 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol.98 
  

  

  Within 
  the 
  species 
  of 
  this 
  genus 
  the 
  suprahumerals 
  in 
  both 
  sexes 
  

   and 
  the 
  genitaha 
  of 
  the 
  male 
  are 
  subject 
  to 
  small 
  variations. 
  S. 
  

   festinus 
  has 
  an 
  extensive 
  range 
  across 
  southern 
  United 
  States 
  and 
  as 
  

   far 
  south 
  as 
  Costa 
  Rica. 
  The 
  suprahumerals 
  in 
  this 
  species 
  are 
  

   sometimes 
  greatly 
  suppressed 
  or 
  sometimes 
  strongly 
  developed, 
  form- 
  

   ing 
  small 
  horns. 
  Horned 
  individuals 
  may 
  be 
  confused 
  with 
  occi- 
  

   dentalis, 
  but 
  the 
  development 
  of 
  the 
  horns 
  is 
  never 
  as 
  pronounced 
  as 
  

   in 
  occidentalis 
  and 
  the 
  styles 
  in 
  occidentalis 
  are 
  slenderer 
  and 
  much 
  

   more 
  narrowed 
  at 
  midlength 
  than 
  mfestinus. 
  

  

  For 
  the 
  present 
  franciscanus 
  is 
  retained 
  as 
  a 
  valid 
  species 
  since 
  the 
  

   thorax 
  is 
  lower, 
  the 
  methopidum 
  more 
  rounded, 
  and 
  the 
  styles 
  more 
  

   serrate 
  than 
  in 
  festinus. 
  The 
  interpretation 
  oi 
  franciscanus 
  is 
  based 
  

   on 
  specimens 
  determined 
  by 
  Van 
  Duzee 
  (1908, 
  pp. 
  48, 
  49). 
  S. 
  

   nigricans 
  seems 
  to 
  be 
  a 
  color 
  variety 
  oi 
  franciscanus 
  since 
  there 
  are 
  no 
  

   consistent 
  structural 
  characters 
  that 
  will 
  differentiate 
  the 
  two 
  forms. 
  

   It 
  is 
  interesting 
  to 
  note 
  that 
  franciscanus 
  has 
  been 
  reported 
  by 
  

   Yothers 
  (1941, 
  p. 
  1) 
  as 
  ovipositing 
  on 
  orchard 
  trees, 
  while 
  its 
  close 
  

   relsiiiYe, 
  festinus, 
  according 
  to 
  Wildermuth 
  (1915) 
  completes 
  its 
  life 
  

   cycle 
  on 
  alfalfa. 
  

  

  S. 
  rotundatus 
  may 
  be 
  a 
  subspecies 
  oi 
  festinus 
  occurring 
  in 
  insular 
  

   America 
  as 
  the 
  two 
  forms 
  are 
  very 
  close; 
  however, 
  the 
  styles 
  in 
  

   rotundatus 
  are 
  broadly 
  sinuate 
  on 
  their 
  dorsal 
  margins 
  while 
  in 
  festinus 
  

   they 
  are 
  evenly 
  arcuate. 
  

  

  S. 
  cornutus 
  is 
  placed 
  in 
  this 
  genus 
  by 
  the 
  authority 
  of 
  Fowler's 
  

   (1895, 
  p. 
  110) 
  observation 
  as 
  to 
  the 
  type 
  of 
  genitalia. 
  This 
  writer 
  

   has 
  seen 
  one 
  specimen 
  that 
  probably 
  belongs 
  to 
  this 
  species. 
  Obser- 
  

   vations 
  based 
  on 
  specimens 
  from 
  the 
  Biologia 
  Centrali-Americana 
  

   material 
  that 
  are 
  in 
  the 
  collection 
  of 
  the 
  U. 
  S. 
  National 
  Museum 
  

   reveal 
  that 
  fuscus 
  and 
  dubius 
  are 
  color 
  varieties 
  oi 
  festinus. 
  

  

  S. 
  femoratus 
  has 
  been 
  reported 
  ovipositing 
  on 
  orchard 
  trees 
  in 
  the 
  

   United 
  States, 
  but 
  there 
  are 
  no 
  specimens 
  of 
  this 
  species 
  in 
  the 
  U. 
  S. 
  

   National 
  Museum 
  collection 
  from 
  north 
  of 
  Mexico, 
  D. 
  F. 
  Probably 
  

   uniformis 
  is 
  conspecific 
  with 
  femoratus, 
  but 
  there 
  is 
  no 
  evidence 
  to 
  

   substantiate 
  this 
  supposition 
  other 
  than 
  the 
  inadequate 
  description 
  

   by 
  Fairmaire 
  which 
  indicates 
  that 
  it 
  may 
  be 
  a 
  color 
  variety 
  oi 
  femo- 
  

   ratus. 
  Accordingly, 
  uniformis 
  is 
  provisionally 
  retained 
  as 
  a 
  valid 
  

   species 
  in 
  this 
  genus. 
  

  

  S. 
  constans, 
  as 
  recognized 
  from 
  specimens 
  from 
  the 
  type 
  locality 
  

   comparing 
  favorably 
  with 
  the 
  original 
  description 
  by 
  Walker 
  (1851, 
  

   p. 
  563) 
  and 
  with 
  the 
  illustration 
  by 
  Knight 
  (Funkhouser, 
  1923, 
  pi. 
  

   3, 
  fig. 
  1), 
  is 
  not 
  represented 
  in 
  the 
  collection 
  of 
  the 
  U. 
  S. 
  National 
  

   Museum 
  by 
  specimens 
  collected 
  west 
  of 
  Iowa. 
  Typical 
  constans 
  is 
  

   suddenly 
  replaced 
  in 
  central 
  and 
  southern 
  Texas 
  by 
  a 
  form 
  that 
  has 
  

   a 
  different 
  type 
  of 
  style 
  but 
  similar 
  aedeagus. 
  This 
  form 
  is 
  believed 
  

   to 
  represent 
  a 
  new 
  subspecies. 
  

  

  