﻿The 
  British 
  Species 
  of 
  Andrena 
  and 
  Nomada. 
  287 
  

  

  black 
  colour 
  is 
  not 
  very 
  noticeable; 
  hairs 
  of 
  clypeus, 
  

   those 
  beneath 
  the 
  cheeks 
  and 
  on 
  the 
  thorax 
  beneath 
  

   and 
  basal 
  parts 
  of 
  the 
  legs, 
  or 
  on 
  some 
  of 
  these 
  parts 
  

   distinctly 
  fulvescent 
  nigriceps. 
  

  

  62. 
  (61) 
  Abdomen 
  much 
  less 
  pubescent 
  to 
  the 
  naked 
  eye 
  and 
  the 
  

  

  abdomen 
  much 
  blacker 
  ; 
  hairs 
  of 
  clypeus, 
  those 
  beneath 
  

   the 
  cheeks, 
  and 
  on 
  the 
  underparts 
  of 
  the 
  thorax, 
  coxae 
  

   and 
  trochanters 
  usually 
  white 
  (unless 
  stained 
  by 
  pollen). 
  

  

  simillima. 
  

  

  63. 
  (58) 
  Head 
  seen 
  from 
  in 
  front 
  of 
  abnormal 
  shape, 
  the 
  hind 
  angles 
  

  

  a 
  little 
  prominent 
  or 
  turned 
  outwards. 
  

  

  64. 
  (65) 
  Third 
  and 
  4th 
  abdominal 
  segments, 
  viewed 
  laterally, 
  clothed 
  

  

  with 
  very 
  short 
  erect 
  pale 
  hairs 
  in 
  front 
  of 
  the 
  apical 
  

   bands 
  ; 
  cheeks 
  ordinary 
  3-dentata. 
  

  

  65. 
  (64) 
  Third 
  and 
  4th 
  segments 
  with 
  very 
  short 
  erect 
  black 
  hairs 
  ; 
  

  

  cheeks 
  forming 
  a 
  small 
  prominent 
  angle 
  at 
  the 
  mandi- 
  

   bular 
  articulation 
  denticnlata. 
  

  

  66. 
  (57) 
  Tubercle 
  of 
  labrum 
  not 
  upturned. 
  

  

  67. 
  (90) 
  Extremely 
  small 
  species, 
  the 
  mandibles 
  always 
  short, 
  the 
  

  

  one 
  resting 
  on 
  the 
  other 
  and 
  not 
  forming 
  a 
  cross 
  at 
  the 
  

   tips; 
  general 
  surface 
  of 
  2nd 
  abdominal 
  segment 
  nearly 
  

   glabrous, 
  with 
  only 
  very 
  minute 
  hairs. 
  

   (Fourth 
  antennal 
  joint 
  short, 
  generally 
  transverse, 
  rarely 
  

   as 
  long 
  as 
  broad, 
  never 
  elongate.) 
  

  

  68. 
  (71) 
  First 
  two 
  abdominal 
  segments 
  shining 
  or 
  polished 
  between 
  

  

  the 
  punctures, 
  the 
  2nd 
  densely 
  and 
  distinctly 
  punctured, 
  

   sometimes 
  so 
  closely 
  that 
  hardly 
  any 
  surface 
  remains 
  

   between 
  the 
  punctures. 
  

  

  69. 
  (70) 
  Abdomen 
  beneath 
  dull 
  or 
  hardly 
  at 
  all 
  shining; 
  claw 
  joint 
  

  

  of 
  hind 
  tarsi 
  dark. 
  • 
  nana 
  K. 
  

  

  70. 
  (69) 
  Abdomen 
  beneath 
  shining, 
  claw-joints 
  clear 
  yellow, 
  stigma 
  

  

  of 
  front 
  wings 
  very 
  conspicuously 
  pale. 
  . 
  . 
  alflcenella. 
  

  

  71. 
  (68) 
  First 
  two 
  segments 
  of 
  the 
  abdomen 
  not 
  distinctly 
  shining, 
  

  

  but 
  one 
  or 
  both 
  are 
  largely 
  dull 
  from 
  the 
  minute 
  sculpture 
  

   of 
  the 
  surface. 
  

  

  72. 
  (75) 
  Whole 
  face 
  clothed 
  with 
  blackish 
  or 
  sooty 
  grey 
  hairs. 
  

  

  73. 
  (74) 
  Stigma 
  very 
  pale 
  even 
  when 
  viewed 
  on 
  the 
  undersurface, 
  

  

  claw-joints 
  of 
  tarsi 
  clear 
  yellowish; 
  2nd 
  abdominal 
  

   segment 
  with 
  numerous 
  distinct 
  but 
  shallow 
  punctures. 
  

  

  moricella. 
  

  

  by 
  the 
  apical 
  ciliation 
  of 
  the 
  ventral 
  segments 
  rather 
  more 
  clearly 
  

   defined 
  than 
  in 
  nigriceps. 
  The 
  latter 
  often 
  has 
  numerous 
  black 
  hairs 
  

   on 
  the 
  basal 
  jaart 
  of 
  the 
  5th 
  and 
  sometimes 
  of 
  the 
  4th 
  abdominal 
  

   segments. 
  

  

  