﻿42 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol. 
  los 
  

  

  genital 
  plate 
  (fig. 
  10, 
  «, 
  c) 
  ; 
  (6) 
  conspicuous 
  spines 
  on 
  ventroposterior 
  

   margin 
  of 
  each 
  femur. 
  

  

  Of 
  the 
  foregoing 
  features, 
  the 
  second 
  and 
  fifth 
  are 
  specific 
  for 
  the 
  

   separation 
  of 
  this 
  roach 
  from 
  other 
  species 
  occurring 
  in 
  the 
  United 
  

   States 
  and 
  the 
  others 
  are 
  highly 
  confirmatory 
  when 
  in 
  combination. 
  

  

  The 
  native 
  Nearctic 
  species 
  most 
  likely 
  to 
  be 
  mistaken 
  ^ 
  for 
  E. 
  livens 
  

   are 
  Chorisoneura 
  texensis 
  Saussure 
  and 
  Zehntner, 
  of 
  Texas 
  and 
  the 
  

   Southeast, 
  and 
  members 
  of 
  the 
  genus 
  Cariblatta. 
  Both 
  have 
  claws 
  of 
  

   equal 
  length, 
  and 
  Cariblatta 
  lacks 
  a 
  well-developed, 
  intercalated 
  tri- 
  

   angle. 
  C. 
  texensis 
  has 
  a 
  large 
  intercalated 
  triangle, 
  but 
  has 
  no 
  con- 
  

   spicuous 
  spines 
  along 
  the 
  posterior 
  margins 
  of 
  the 
  femora. 
  The 
  best- 
  

   known 
  outdoor 
  roaches 
  of 
  the 
  Eastern 
  States 
  belong 
  to 
  the 
  genus 
  Par- 
  

   coblatta; 
  all 
  are 
  larger 
  than 
  livens 
  and 
  lack 
  an 
  intercalated 
  triangle. 
  

  

  Identification 
  of 
  the 
  Massachusetts 
  specimens 
  of 
  livens 
  was 
  aided 
  

   by 
  comparisons 
  made 
  at 
  the 
  Academy 
  of 
  Natural 
  Sciences 
  of 
  Phila- 
  

   delphia 
  with 
  authentic 
  French 
  and 
  Swiss 
  material, 
  given 
  to 
  the 
  Acad- 
  

   emy 
  by 
  the 
  Swiss 
  entomologist 
  Henri 
  de 
  Saussure. 
  

  

  Description. 
  — 
  Adults 
  : 
  General 
  form 
  as 
  in 
  plate 
  2, 
  figure 
  6 
  ; 
  tegmina 
  

   and 
  wings 
  covering 
  abdomen 
  ; 
  width 
  between 
  eyes 
  on 
  vertex 
  about 
  1^ 
  

   times 
  length 
  of 
  first 
  antennal 
  segment 
  (female), 
  slightly 
  less 
  in 
  male; 
  

   all 
  femora 
  with 
  conspicuous 
  spines 
  on 
  ventroposterior 
  margins 
  ; 
  ven- 
  

   troposterior 
  margin 
  of 
  front 
  femur 
  with 
  three 
  or 
  four 
  well-spaced, 
  

   strong 
  spines 
  along 
  part 
  slightly 
  basad 
  of 
  middle, 
  the 
  more 
  apical 
  one 
  

   often 
  smaller 
  than 
  others, 
  followed 
  by 
  10 
  to 
  15 
  small, 
  delicate 
  spines 
  

   (some 
  of 
  which 
  are 
  frequently 
  broken) 
  extending 
  in 
  a 
  regular 
  row 
  

   nearly 
  to 
  apex, 
  a 
  long 
  curved 
  apical 
  spine 
  closely 
  preceded 
  by 
  a 
  straight 
  

   subapical 
  one 
  about 
  three- 
  fourths 
  as 
  long 
  ; 
  tarsal 
  segments 
  one 
  to 
  four 
  

   each 
  with 
  a 
  tiny, 
  round 
  pulvillus 
  (membranous 
  pad) 
  ; 
  segment 
  5 
  with 
  

   large, 
  broad 
  apical 
  arolium 
  between 
  conspicuously 
  unequal 
  tarsal 
  

   claws, 
  anterior 
  claw 
  about 
  two-thirds 
  length 
  of 
  posterior 
  one, 
  longer 
  

   claw 
  with 
  about 
  four 
  spinelike 
  inner 
  teeth 
  along 
  basal 
  half, 
  teeth 
  on 
  

   smaller 
  claw 
  poorly 
  developed. 
  Tegmen 
  with 
  costal 
  veins 
  simple, 
  

   cubital 
  veins 
  (discoidal 
  sectors) 
  strongly 
  oblique, 
  apex 
  rather 
  sharply 
  

   rounded. 
  Wing 
  with 
  distinctive 
  intercalated 
  triangle 
  (itr, 
  fig. 
  10, 
  

  

  General 
  color 
  pale 
  yellowish; 
  tegmina 
  and 
  marginal 
  area 
  of 
  pro- 
  

   notum 
  transparent, 
  marked 
  with 
  reddish 
  brown 
  spots, 
  on 
  the 
  tegmen 
  

   these 
  spots 
  located 
  on 
  the 
  veins 
  ; 
  eyes 
  dark 
  brown 
  to 
  black 
  ; 
  face 
  yellow 
  

   to 
  reddish 
  orange 
  ; 
  vertex 
  and 
  upper 
  part 
  of 
  face 
  usually 
  with 
  several 
  

   spots 
  of 
  darker 
  orange; 
  coxae 
  and 
  femora 
  unspotted; 
  tibiae 
  with 
  

   dark 
  brown 
  at 
  bases 
  of 
  some 
  spines; 
  venter 
  of 
  abdomen 
  with 
  poorly 
  

  

  *The 
  standard 
  taxonomie 
  reference 
  on 
  Nearctic 
  Blattarla 
  Is 
  that 
  of 
  Hebard 
  (1917). 
  A 
  

   recent 
  key 
  to 
  genera 
  is 
  by 
  John 
  W. 
  H. 
  Rehn 
  (1950). 
  The 
  European 
  species 
  of 
  EctoMus 
  

   were 
  reviewed 
  by 
  Ramme 
  (1923). 
  

  

  