﻿The 
  British 
  Species 
  of 
  Andrena 
  and 
  Nomada. 
  283 
  

  

  teeth, 
  the 
  labral 
  tubercle 
  upturned 
  and 
  forming 
  a 
  curved 
  

   outline 
  between 
  the 
  teeth 
  of 
  the 
  clypeus 
  (easily 
  seen 
  if 
  

   the 
  head 
  be 
  viewed 
  from 
  beneath). 
  . 
  . 
  . 
  marginata. 
  

  

  5. 
  (4) 
  Clypeus 
  and 
  labrum 
  otherwise. 
  

  

  6. 
  (7) 
  A 
  very 
  large 
  species 
  with 
  strongly 
  infuscated 
  wings, 
  shining 
  

  

  abdomen 
  and 
  thorax 
  and 
  the 
  clypeus 
  only 
  yellow 
  (no 
  

   lateral 
  spots 
  outside 
  this) 
  hattorfiana. 
  

  

  7. 
  (6) 
  If 
  large, 
  the 
  species 
  have 
  a 
  dull 
  thorax 
  and 
  abdomen, 
  or 
  

  

  else 
  a 
  large 
  lateral 
  yellow 
  spot 
  on 
  either 
  side 
  of 
  the 
  

   clypeus. 
  

  

  8. 
  (11) 
  Mesonotum 
  and 
  scutellum 
  conspicuously 
  shining 
  or 
  polished 
  

  

  between 
  the 
  punctures 
  ; 
  small 
  species. 
  

  

  9. 
  (10) 
  Clypeus 
  and 
  a 
  spot 
  on 
  either 
  side 
  of 
  it 
  yellow, 
  hind 
  tarsi 
  

  

  dark, 
  the 
  hind 
  tibiae 
  slender 
  coitana. 
  

  

  10. 
  (9) 
  Clypeus 
  only 
  pale, 
  hind 
  tarsi 
  clear 
  testaceous, 
  hind 
  tibiae 
  

  

  thick 
  tarsata. 
  

  

  11. 
  (8) 
  Mesonotum 
  and 
  scutellum 
  with 
  ruguloso 
  sculpture 
  between 
  

  

  the 
  punctures, 
  not 
  polished. 
  

  

  12. 
  (13) 
  Basal 
  abdominal 
  segments 
  with 
  many 
  of 
  its 
  punctures 
  set 
  

  

  in 
  conspicuous 
  granulations 
  humilis. 
  

  

  13. 
  (12) 
  Basal 
  abdominal 
  segment 
  not 
  granulately 
  punctate. 
  

  

  14. 
  (15) 
  Basal 
  abdominal 
  segment 
  strongly 
  punctured, 
  well 
  clothed 
  

  

  with 
  longish 
  hairs 
  all 
  over; 
  lateral 
  facial 
  spots 
  large. 
  

  

  labialis. 
  

  

  15. 
  (14) 
  Basal 
  abdominal 
  segment 
  very 
  finely 
  punctured, 
  to 
  a 
  large 
  

  

  extent 
  nearly 
  glabrous; 
  lateral 
  facial 
  spots 
  small 
  or 
  

   absent. 
  chrysosceles 
  K. 
  

  

  16. 
  (1) 
  Clypeus 
  black. 
  

  

  17. 
  (24) 
  Anterior 
  area 
  of 
  the 
  propodeum 
  more 
  or 
  less 
  coarsely 
  rugose 
  

  

  and 
  always 
  bounded 
  behind 
  at 
  the 
  middle 
  (on 
  or 
  near 
  

   the 
  edge 
  of 
  the 
  posterior 
  surface) 
  by 
  a 
  raised 
  line 
  or 
  

   transverse 
  rugosity. 
  (The 
  mandibles 
  are 
  always 
  short 
  

   and 
  lie 
  one 
  on 
  the 
  other, 
  the 
  tips 
  not 
  crossed; 
  the 
  3rd 
  

   antennal 
  joint 
  is 
  never 
  at 
  all 
  longer 
  than 
  the 
  4th.) 
  

  

  18. 
  (19) 
  Second 
  abdominal 
  segment 
  clothed 
  only 
  with 
  very 
  short 
  

  

  hairs, 
  the 
  hind 
  tarsi 
  and 
  the 
  hind 
  tibiae 
  (to 
  a 
  large 
  

   extent 
  at 
  least) 
  clear 
  testaceous 
  or 
  yellow. 
  . 
  albicans. 
  

  

  19. 
  (18) 
  If 
  the 
  hind 
  tarsi 
  and 
  tibiae 
  are 
  largely 
  clear 
  testaceous 
  the 
  

  

  abdomen 
  has 
  abundant 
  long 
  hairs. 
  (In 
  all 
  the 
  following 
  

   species 
  of 
  the 
  section 
  the 
  2nd 
  segment 
  has 
  long 
  or 
  longish 
  

   hairs 
  on 
  the 
  middle, 
  except 
  in 
  abraded 
  examples.) 
  

  

  20. 
  (21) 
  Hind 
  tibiae 
  with 
  black 
  hairs. 
  . 
  . 
  carbonaria 
  (pi'ipes.) 
  

  

  21. 
  (20) 
  Hind 
  tibiae 
  with 
  pale 
  hairs. 
  

  

  22. 
  (23) 
  Hind 
  tarsi 
  and 
  tibiae 
  dark, 
  black 
  or 
  pitchy. 
  . 
  bimaculata. 
  

  

  