﻿The 
  British 
  Species 
  of 
  Andrena 
  and 
  Nomada. 
  311 
  

  

  (Labrum 
  black, 
  the 
  mesonotum 
  without 
  red 
  lines, 
  though 
  

   the 
  scutellum 
  has 
  red 
  spots 
  or 
  marking.) 
  

  

  4. 
  (5) 
  Hind 
  femora 
  ferruginous 
  above, 
  the 
  flagellum 
  of 
  antennae 
  

  

  pale 
  beneath. 
  germanica. 
  

  

  5. 
  (4) 
  Hind 
  femora 
  nearly 
  entirely 
  black, 
  flagellum 
  mostly 
  dark 
  

  

  beneath 
  argenfata. 
  

  

  (Propodeum 
  very 
  densely 
  and 
  conspicuously 
  clothed 
  with 
  

   silver 
  hairs 
  outside 
  the 
  area.) 
  

  

  6. 
  (3) 
  Abdomen 
  rarely 
  without 
  either 
  yellow 
  spots 
  or 
  bands, 
  and 
  

  

  if 
  so, 
  the 
  propodeum 
  is 
  bare 
  along 
  the 
  margins 
  of 
  the 
  

   area, 
  the 
  pubescence 
  forming 
  a 
  patch 
  or 
  tuft 
  on 
  each 
  

   side. 
  

  

  7. 
  (8) 
  A 
  large 
  species 
  8*5-11 
  mm., 
  labrum 
  black 
  with 
  a 
  strong 
  

  

  triangular 
  tooth 
  in 
  the 
  middle 
  towards 
  the 
  apex. 
  

  

  annata. 
  

  

  (Spots 
  of 
  2nd 
  abdominal 
  segment 
  lateral, 
  apical 
  margin 
  

  

  of 
  hind 
  tibiae 
  with 
  a 
  close 
  series 
  of 
  strong 
  black 
  spines 
  ; 
  

  

  sides 
  of 
  propodeum 
  with 
  dense 
  silver 
  pubescence 
  outside 
  

  

  the 
  area.) 
  

  

  8. 
  (7) 
  When 
  the 
  labrum 
  is 
  black 
  the 
  species 
  are 
  less 
  than 
  8 
  mm. 
  

  

  long. 
  

  

  9. 
  (10) 
  Apical 
  margin 
  of 
  hind 
  tibiae 
  with 
  2-4 
  excessively 
  short, 
  

  

  approximated, 
  black 
  spines, 
  which 
  often 
  appear 
  at 
  

   first 
  sight 
  as 
  a 
  small 
  black 
  spot 
  on 
  the 
  margin. 
  

  

  guftulata. 
  

   (YeUow 
  spots 
  of 
  2nd 
  abdominal 
  segment 
  small 
  and 
  lateral, 
  

   the 
  5th 
  with 
  a 
  pair 
  of 
  triangular 
  ones 
  sometimes 
  ap- 
  

   proximated 
  basally; 
  scape 
  of 
  antennae 
  black 
  beneath, 
  

   labrum 
  pale, 
  propodeum 
  with 
  conspicuous 
  tuft 
  of 
  silver 
  

   pubescence 
  on 
  each 
  side 
  ; 
  species 
  small 
  or 
  rather 
  small. 
  ) 
  

  

  10. 
  (9) 
  Apical 
  margin 
  of 
  hind 
  tibiae 
  never 
  armed 
  as 
  in 
  guttulata. 
  

  

  11. 
  (12) 
  Labrum 
  and 
  scape* 
  both 
  black 
  or 
  pitchy 
  black 
  and 
  the 
  

  

  4th 
  antennal 
  joint 
  seen 
  from 
  in 
  front 
  is 
  only 
  a 
  little 
  

  

  longer 
  than 
  wide 
  obtusifrons. 
  

  

  (A 
  small 
  species, 
  the 
  spots 
  of 
  the 
  2nd 
  abdominal 
  segment 
  

   widely 
  separated, 
  propodeum 
  only 
  with 
  short 
  incon- 
  

   spicuous 
  pubescence 
  ; 
  face 
  between 
  the 
  antennae 
  not 
  

   compressed 
  into 
  a 
  sharp 
  median 
  carina.) 
  

  

  12. 
  (11) 
  If 
  the 
  labrum 
  and 
  scape 
  beneath 
  are 
  both 
  black, 
  the 
  4th 
  

  

  antennal 
  joint 
  is 
  about 
  twice 
  as 
  long 
  as 
  wide; 
  in 
  most 
  

   species 
  the 
  labrum 
  is 
  pale. 
  

  

  13. 
  (18) 
  Mesopleura 
  and 
  propodeum 
  outside 
  the 
  area 
  with 
  at 
  

  

  * 
  The 
  extreme 
  base 
  of 
  the 
  scape 
  is 
  sometimes 
  red. 
  

  

  