﻿The 
  British 
  Species 
  of 
  Andrena 
  and 
  Nomada. 
  239 
  

  

  an 
  extremely 
  small 
  proportion 
  of 
  the 
  total 
  number 
  of 
  

   specimens 
  that 
  are 
  seen. 
  It 
  is 
  an 
  early 
  spring 
  bee, 
  and 
  

   visits 
  the 
  sallow 
  catkins 
  and 
  is 
  extremely 
  partial 
  to 
  the 
  

   dandelion, 
  but 
  also 
  occurs 
  on 
  Brassica, 
  Tussilago, 
  and 
  

   various 
  other 
  plants. 
  In 
  N.W. 
  Germany 
  it 
  has 
  a 
  second 
  

   brood, 
  which 
  differs 
  somewhat 
  from 
  the 
  first, 
  but 
  there 
  it 
  

   appears 
  to 
  be 
  only 
  exceptionally 
  double-brooded, 
  and 
  I 
  

   have 
  seen 
  no 
  such 
  specimens 
  from 
  England. 
  

  

  In 
  some 
  localities 
  this 
  species 
  is 
  very 
  frequently 
  stylop- 
  

   ised, 
  but 
  not 
  by 
  any 
  means 
  wherever 
  it 
  occurs. 
  It 
  is 
  

   parasitised 
  by 
  N 
  . 
  lineola, 
  but 
  only 
  locally, 
  and 
  I 
  have 
  

   found 
  it 
  very 
  abundant 
  in 
  some 
  places 
  without 
  a 
  trace 
  of 
  

   this 
  Nomada. 
  

  

  A. 
  bimaculata, 
  vmlike 
  the 
  preceding, 
  is 
  regularly 
  double- 
  

   brooded 
  in 
  the 
  southern 
  counties, 
  at 
  least. 
  It 
  is 
  very 
  

   partial 
  to 
  coast 
  localities, 
  but 
  is 
  also 
  found 
  on 
  the 
  commons 
  

   near 
  London, 
  and 
  is 
  widely 
  distributed 
  in 
  such 
  places 
  in 
  

   Surrey. 
  It 
  abounds 
  locally 
  in 
  Norfolk 
  and 
  Suffolk 
  and 
  

   in 
  Berks, 
  and 
  is 
  particularly 
  common 
  in 
  Devonshire, 
  

   where 
  it 
  ranges 
  inland 
  to 
  a 
  height 
  of 
  nearly 
  1000 
  ft. 
  above 
  

   the 
  sea 
  on 
  Dartmoor. 
  But 
  it 
  is 
  always 
  quite 
  local. 
  I 
  have 
  

   never 
  myself 
  found 
  an 
  extensive 
  compact 
  colony 
  of 
  this 
  

   species, 
  but 
  have 
  seen 
  the 
  burrows 
  scattered 
  , 
  at 
  most 
  two 
  

   or 
  three 
  together, 
  over 
  acres 
  of 
  sandy 
  soil. 
  In 
  the 
  spring 
  

   these 
  bees 
  visit 
  chiefly 
  Salix 
  and 
  Prunus, 
  and 
  in 
  some 
  

   localities 
  the 
  flowers 
  of 
  Ulex 
  and 
  even 
  Bellis 
  ; 
  in 
  the 
  summer 
  

   they 
  are 
  most 
  partial 
  to 
  Rubus, 
  but 
  in 
  some 
  places 
  have 
  

   abounded 
  on 
  Senecio. 
  

  

  Near 
  London 
  and 
  in 
  the 
  eastern 
  counties 
  red-marked 
  

   varieties 
  are 
  frequently 
  common, 
  but 
  in 
  the 
  far 
  west 
  they 
  

   must 
  be 
  very 
  rare 
  indeed, 
  as 
  I 
  have 
  never 
  met 
  with 
  one. 
  

  

  This 
  species 
  is 
  occasionally 
  stylopised. 
  On 
  the 
  12th 
  

   of 
  August, 
  1914, 
  I 
  took 
  two 
  females 
  on 
  bramble 
  flowers 
  

   containing 
  the 
  parasite, 
  one 
  of 
  these, 
  as 
  is 
  usual, 
  being 
  

   free 
  from 
  pollen, 
  except 
  such 
  as 
  might 
  have 
  accidentally 
  

   adhered, 
  but 
  the 
  other 
  had 
  gathered 
  a 
  full 
  load, 
  not 
  only 
  

   the 
  hind 
  tibiae, 
  the 
  floccus 
  and 
  hind 
  femoral 
  receptacle, 
  

   but 
  even 
  the 
  propodeal 
  basket 
  being 
  filled. 
  The 
  first 
  

   brood 
  is 
  also 
  subject 
  to 
  the 
  attack 
  of 
  Stylops. 
  

  

  Nmnada 
  lineola 
  is 
  an 
  abundant 
  parasite 
  of 
  this 
  Andrena 
  

   in 
  Devonshire, 
  and 
  like 
  its 
  host 
  is 
  double-brooded 
  there. 
  

  

  A. 
  flavipes 
  (fidvicrus) 
  is 
  a 
  regularly 
  double-brooded 
  

   species 
  in 
  the 
  south, 
  and 
  though 
  decidedly 
  local, 
  where 
  it 
  

   is 
  found, 
  it 
  generally 
  occurs 
  in 
  great 
  numbers, 
  frequently 
  

  

  