﻿The 
  British 
  Species 
  of 
  Andrena 
  and 
  Notnada. 
  313 
  

  

  26. 
  (27) 
  Third 
  antennal 
  joint 
  seen 
  from 
  beneath 
  distinctly 
  (though 
  

  

  not 
  greatly) 
  longer 
  than 
  the 
  4th. 
  . 
  . 
  . 
  laihburiana. 
  

   (Scutellum 
  with 
  two 
  yellow 
  spots 
  sometimes 
  suffused 
  with 
  

   orange 
  ; 
  mesonotum 
  with 
  dense 
  erect 
  reddish 
  hair 
  in 
  

   fresh 
  examples, 
  abdomen 
  tricoloured.) 
  

  

  27. 
  (26) 
  Third 
  antennal 
  joint 
  beneath 
  at 
  most 
  equal 
  to 
  the 
  4th, 
  

  

  often 
  rather 
  shorter. 
  

  

  28. 
  (31) 
  Abdomen 
  black 
  and 
  yellow 
  not 
  definitely 
  tricoloured, 
  the 
  

  

  mesonotum 
  without 
  red 
  lines 
  or 
  markings. 
  

  

  29. 
  (30) 
  Apical 
  marking 
  of 
  face 
  not 
  continued 
  up 
  along 
  the 
  margins 
  

  

  of 
  the 
  eyes 
  to 
  the 
  height 
  of 
  the 
  antennae 
  ; 
  flagellum 
  of 
  

   antennae 
  unicolorous, 
  not 
  distinctly 
  dark 
  or 
  infuscated 
  

   on 
  any 
  of 
  the 
  joints 
  in 
  front. 
  . 
  . 
  . 
  marshamella. 
  

  

  30. 
  (29) 
  Apical 
  markings 
  continued 
  along 
  the 
  eye-margins 
  up 
  to 
  

  

  the 
  line 
  of 
  the 
  antennal 
  insertions, 
  or 
  else 
  the 
  more 
  

   apical 
  flagellar 
  joints 
  at 
  least 
  are 
  darkened 
  in 
  front. 
  

  

  lineola. 
  

  

  31. 
  (28) 
  Abdomen 
  obviously 
  brown 
  or 
  ferruginous 
  in 
  part 
  (tri- 
  

  

  coloured). 
  

  

  32. 
  (33) 
  Pronotum 
  above 
  with 
  yellow 
  band 
  or 
  spots 
  and 
  its 
  

  

  tubercles 
  also 
  bright 
  yellow; 
  mesonotum 
  without 
  red 
  

   markings, 
  scutellum 
  nearly 
  always 
  with 
  a 
  pair 
  of 
  yellow 
  

   spots 
  lineola 
  var. 
  

  

  33. 
  (32) 
  Pronotum 
  often 
  red-marked 
  or 
  else 
  black, 
  not 
  yellow- 
  

  

  marked. 
  

  

  34. 
  (35) 
  Mandibles 
  bifid 
  at 
  the 
  apex. 
  bifida. 
  

  

  (Apex 
  of 
  hind 
  tibiae 
  with 
  elongate 
  very 
  fine 
  spines 
  of 
  nearly 
  

   equal 
  length 
  amongst 
  the 
  hair 
  fringe 
  ; 
  dense 
  rather 
  long 
  

   white 
  hairs 
  on 
  either 
  side 
  of 
  the 
  anterior 
  area 
  of 
  pro- 
  

   podeum 
  ; 
  black 
  ocellar 
  area 
  generally 
  entirely 
  surrounded 
  

   by 
  red. 
  ) 
  

  

  35. 
  (34) 
  Mandibles 
  not 
  bifid. 
  

  

  36. 
  (37) 
  Apical 
  margin 
  of 
  hind 
  tibiae 
  armed 
  with 
  several 
  (normally 
  

  

  5) 
  very 
  long, 
  conspicuous 
  black 
  spines, 
  not 
  differing 
  

  

  much 
  from 
  one 
  another. 
  baccuta. 
  

  

  (Abdominal 
  markings 
  cream-coloured; 
  propodeum 
  red 
  

   with 
  a 
  median 
  black 
  stripe 
  and 
  densely 
  silvery-haired 
  

   outside 
  the 
  area; 
  greater 
  part 
  of 
  mesonotum 
  red.) 
  

  

  37. 
  (36) 
  Apical 
  margin 
  of 
  hind 
  tibiae 
  otherwise 
  armed. 
  

  

  38. 
  (39) 
  Mandibles 
  truncate 
  * 
  at 
  apex 
  hillana. 
  

  

  (Spots 
  of 
  2nd 
  abdominal 
  segment 
  lateral, 
  very 
  widely 
  

   separated, 
  apex 
  of 
  hind 
  tibiae 
  with 
  the 
  innermost 
  of 
  

  

  * 
  This 
  character 
  can 
  only 
  be 
  seen 
  clearly 
  in 
  certain 
  aspects. 
  

  

  