﻿160 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol. 
  103 
  

  

  3. 
  Lateral 
  margins'of 
  pronotum 
  behind 
  middle_ 
  distinctly 
  [emarginate; 
  Western 
  

  

  United 
  States 
  C. 
  pacificum 
  VanDyke 
  

  

  Lateral 
  margins 
  of 
  pronotum 
  behind 
  middle 
  almost 
  straight 
  (Eastern 
  United 
  

   States) 
  C. 
  ungulare 
  LeConte 
  

  

  4. 
  Antennae 
  with 
  last 
  three 
  segments 
  thickened 
  5 
  

  

  Antennae 
  with 
  last 
  three 
  segments 
  not 
  markedly 
  thickened 
  6 
  

  

  5. 
  Elytra 
  without 
  sutural 
  and 
  marginal 
  black 
  stripes 
  (Eastern 
  United 
  States) 
  . 
  

  

  C 
  lepturides 
  Newman 
  

  

  Elytra 
  with 
  sutural 
  and 
  marginal 
  black 
  stripes 
  (Amur 
  River, 
  Eastern 
  Siberia 
  

  

  and 
  Japan) 
  C. 
  pallens 
  Motschulsky 
  

  

  6. 
  Three 
  distal 
  antennal 
  segments 
  together 
  approximately 
  1.5 
  mm. 
  long 
  (West 
  

  

  Coast 
  of 
  United 
  States) 
  C. 
  bicolor 
  Horn 
  

  

  Three 
  distal 
  antennal 
  segments 
  together 
  barely 
  over 
  1 
  mm. 
  long 
  (Western 
  

   United 
  States 
  and 
  Canada) 
  7 
  

  

  7. 
  Male 
  with 
  bifurcate 
  process 
  of 
  third 
  visible 
  abdominal 
  sternite 
  long 
  and 
  finger- 
  

  

  like; 
  female 
  with 
  apical 
  abdominal 
  sternite 
  shallowly 
  and 
  narrowlj' 
  emargi- 
  

  

  nate; 
  color 
  of 
  female 
  black 
  to 
  testaceous 
  C. 
  tenuicorne 
  LeConte 
  

  

  Male 
  with 
  bifurcate 
  process 
  of 
  third 
  visible 
  abdominal 
  sternite 
  shorter, 
  more 
  

   triangular; 
  female 
  with 
  apical 
  abdominal 
  sternite 
  deeply 
  emarginate; 
  color 
  

   of 
  female 
  reddish 
  testaceous 
  with 
  elj'tra 
  and 
  metasternum 
  black. 
  

  

  C. 
  vandykei 
  Hopping 
  and 
  Hopping 
  

  

  Key 
  to 
  the 
  species 
  of 
  Cephaloon, 
  based 
  upon 
  the 
  male 
  genitalia 
  

  

  Male 
  of 
  Cephaloon 
  variabilis 
  Motschulsky 
  unknown. 
  

  

  1. 
  Ratio 
  of 
  length 
  of 
  paramere 
  to 
  length 
  of 
  basal 
  piece 
  not 
  over 
  1:2 
  2 
  

  

  Ratio 
  of 
  length 
  of 
  paramere 
  to 
  length 
  of 
  basal 
  piece 
  not 
  less 
  than 
  1:3.5 
  3 
  

  

  2. 
  Median 
  lobe 
  tapering 
  abruptly 
  at 
  apical 
  third, 
  slender 
  (pi. 
  5, 
  fig. 
  8) 
  ; 
  paramere 
  

  

  lobes 
  long 
  and 
  slender 
  C. 
  pallens 
  Motschulsky 
  

  

  Median 
  lobe 
  evenly 
  tapering 
  from 
  base, 
  more 
  robust 
  (pi. 
  5, 
  fig. 
  9) 
  ; 
  paramere 
  

   lobes 
  shorter 
  and 
  heavier 
  (pi. 
  5, 
  fig. 
  5) 
  C. 
  lepturides 
  Newman 
  

  

  3. 
  Paramere 
  lobes 
  acute 
  at 
  apex 
  (pi. 
  5, 
  fig. 
  6); 
  median 
  lobe 
  long 
  and 
  slender, 
  

  

  sides 
  more 
  parallel 
  C. 
  ungulare 
  LeConte 
  

  

  Paramere 
  lobes 
  enlarged 
  at 
  apex; 
  median 
  lobe 
  shorter 
  and 
  more 
  robust 
  at 
  

   apex 
  4 
  

  

  4. 
  Apex 
  of 
  paramere 
  lobes 
  about 
  twice 
  width 
  of 
  base 
  when 
  viewed 
  laterally 
  

  

  (pi. 
  5, 
  fig. 
  3) 
  C 
  vandykei 
  Hopping 
  and 
  Hopping 
  and 
  C. 
  bicolor 
  Horn 
  

  

  Apex 
  of 
  paramere 
  lobes 
  about 
  same 
  width 
  as 
  at 
  base 
  5 
  

  

  5. 
  Apex 
  of 
  basal 
  piece 
  laterally 
  extending 
  beyond 
  base 
  of 
  paramere 
  to 
  about 
  

  

  one-half 
  length 
  of 
  paramere 
  lobes; 
  paramere 
  lobes 
  stout, 
  blunt 
  at 
  apex, 
  

  

  uniform 
  in 
  width 
  (pi. 
  5, 
  fig. 
  4) 
  C, 
  pacificum 
  VanDyke 
  

  

  Apex 
  of 
  basal 
  piece 
  laterally 
  extending 
  only 
  slightly 
  beyond 
  base 
  of 
  paramere; 
  

   paramere 
  lobes 
  more 
  slender, 
  and 
  slightly 
  enlarged 
  at 
  apex 
  (pi. 
  5, 
  fig. 
  2). 
  

  

  C. 
  tenuicorne 
  LeConte 
  

  

  In 
  view 
  of 
  the 
  relatively 
  recent 
  and 
  thorough 
  discussion 
  of 
  the 
  

   species 
  by 
  Hopping 
  and 
  Hopping 
  (1934), 
  I 
  feel 
  that 
  it 
  is 
  superfluous 
  

   to 
  repeat 
  it 
  here 
  except 
  to 
  mention 
  that 
  under 
  C. 
  bicolor 
  the 
  name 
  

   Drachylis 
  simulans 
  Casey 
  should 
  be 
  added 
  as 
  a 
  synonym 
  (see 
  discus- 
  

   sion 
  under 
  generic 
  synonymy 
  preceding) 
  . 
  

  

  