﻿300 
  Mr. 
  R. 
  C. 
  L. 
  Perkins 
  on 
  

  

  hairs 
  of 
  face 
  black, 
  the 
  floccus 
  sooty 
  or 
  sordid; 
  hind 
  

   tibiae 
  pale 
  clarkella. 
  

  

  59. 
  (58) 
  Abdomen 
  seldom 
  densely 
  clothed, 
  and 
  then 
  not 
  as 
  in 
  

  

  clarkella; 
  the 
  floccus 
  is 
  pale. 
  

  

  60. 
  (67) 
  Fifth 
  antennal 
  joint 
  distinctly 
  elongate, 
  not 
  square 
  in 
  

  

  outline, 
  still 
  less 
  transverse. 
  

  

  61. 
  (62) 
  Hind 
  tibiae 
  clear 
  translucent 
  yellow. 
  .... 
  ferox. 
  

  

  62. 
  (61) 
  Hind 
  tibiae 
  dark 
  beneath 
  the 
  hairs. 
  

  

  63. 
  (64) 
  Floccus 
  very 
  imperfect, 
  small 
  and 
  thin 
  ; 
  even 
  in 
  the 
  finest 
  

  

  examples 
  the 
  whole 
  disc 
  of 
  the 
  basal 
  abdominal 
  segment 
  

   is 
  hairless 
  or 
  nearly 
  so, 
  having 
  at 
  most 
  a 
  few 
  fine 
  and 
  

   long 
  hairs 
  bucephala. 
  

  

  64. 
  (63) 
  Floccus 
  quite 
  perfect, 
  long 
  curved 
  hairs 
  occup5dng 
  the 
  

  

  whole 
  trochanter; 
  in 
  fresh 
  specimens 
  the 
  basal 
  segment 
  

   is 
  clothed 
  all 
  over 
  rather 
  thinly 
  with 
  long 
  hairs 
  or 
  is 
  

   densely 
  clothed 
  apically 
  and 
  with 
  thinner 
  long 
  hairs 
  

   more 
  basally. 
  

  

  65. 
  (66) 
  Clypeus 
  except 
  for 
  a 
  smooth 
  median 
  line 
  with 
  rather 
  even 
  

  

  and 
  close, 
  distinct 
  punctures; 
  minute 
  surface 
  sculpture 
  

   of 
  basal 
  abdominal 
  segment 
  not 
  extrsiordinarily 
  dense 
  

   under 
  a 
  strong 
  lens, 
  so 
  that 
  at 
  the 
  sides 
  it 
  generally 
  

   appears 
  rather 
  shining, 
  and 
  to 
  the 
  naked 
  eye 
  the 
  whole 
  

   abdomen 
  appears 
  somewhat 
  shining 
  and 
  for 
  a 
  large 
  part 
  

   bare 
  . 
  fucata 
  var. 
  

  

  66. 
  (65) 
  Clypeus 
  with 
  a 
  wide 
  median 
  space 
  of 
  irregular 
  punctura- 
  

  

  tion, 
  the 
  punctures 
  themselves 
  often 
  vague 
  in 
  outline; 
  

   minute 
  surface 
  sculpture 
  of 
  the 
  very 
  dull 
  basal 
  segment 
  

   extremely 
  dense; 
  abdomen 
  dull 
  and 
  pubescent 
  to 
  the 
  

   naked 
  eye. 
  helvola. 
  

  

  67. 
  (60) 
  I'ifth 
  antennal 
  joint, 
  viewed 
  beneath 
  (or 
  in 
  front) 
  generally 
  

  

  wider 
  than 
  long, 
  at 
  most 
  so 
  long 
  as 
  to 
  appear 
  about 
  

   square 
  in 
  outline. 
  

  

  68. 
  (69) 
  Hind 
  tibiae 
  clear 
  translucent 
  yellow 
  and 
  nearly 
  concolorous 
  

  

  with 
  the 
  scopal 
  fringe 
  above. 
  

  

  68a. 
  (686) 
  Abdomen 
  nearly 
  glabrous 
  above, 
  basal 
  segment 
  without 
  

   a 
  definite 
  apical 
  impression 
  ruficrus. 
  

  

  686. 
  (68a) 
  Abdomen 
  with 
  longish 
  pubescence, 
  in 
  fresh 
  specimens 
  

   forming 
  distinct 
  apical 
  bands 
  on 
  the 
  segments 
  ; 
  basal 
  seg- 
  

   ment 
  with 
  a 
  distinct 
  apical 
  impression. 
  angustior 
  var. 
  

  

  69. 
  (68) 
  Hind 
  tibiae 
  dark 
  beneath 
  the 
  scopal 
  fringe. 
  

  

  70. 
  (75) 
  Rather 
  small 
  or 
  medium-sized 
  species 
  with 
  the 
  basal 
  

  

  segment 
  widely 
  rugulose 
  along 
  the 
  apical 
  margin 
  and 
  

   on 
  this 
  part 
  (at 
  least 
  on 
  the 
  middle 
  of 
  the 
  segment) 
  

   almost 
  impimctate. 
  

  

  