﻿The 
  British 
  Species 
  of 
  Andrena 
  and 
  Nomada. 
  243 
  

  

  its 
  burrows, 
  but 
  it 
  is 
  doubtful 
  whether 
  it 
  has 
  other 
  enemies 
  

   in 
  that 
  genus, 
  and 
  unconfirmed 
  records 
  of 
  others 
  are 
  

   probably 
  erroneous, 
  Stylopised 
  individuals 
  are 
  numerous, 
  

   and 
  of 
  wide 
  distribution, 
  but 
  are 
  somewhat 
  local 
  in 
  their 
  

   distribution. 
  

  

  The 
  small 
  species, 
  A. 
  gwynana, 
  is 
  an 
  interesting 
  bee 
  

   (though 
  common 
  and 
  generally 
  distributed) 
  on 
  account 
  of 
  

   its 
  variation 
  and 
  in 
  other 
  respects. 
  It 
  is 
  constantly 
  double- 
  

   brooded 
  in 
  the 
  south. 
  In 
  the 
  first 
  brood 
  both 
  sexes 
  normally 
  

   have 
  the 
  face 
  and 
  the 
  greater 
  part 
  at 
  least 
  of 
  the 
  sides 
  of 
  

   the 
  thorax 
  clothed 
  with 
  black 
  hairs, 
  with 
  sometimes 
  a 
  

   few 
  pale 
  hairs 
  about 
  the 
  scape 
  of 
  the 
  antennae, 
  while 
  

   some 
  of 
  the 
  second-brood 
  examples 
  quite 
  resemble 
  these. 
  

   But 
  in 
  extreme 
  forms 
  of 
  this 
  brood 
  nearly 
  the 
  whole 
  face 
  

   of 
  the 
  ^ 
  is 
  clothed 
  with 
  pale 
  brown 
  or 
  ochreous 
  hairs, 
  and 
  

   in 
  the 
  $ 
  sometimes 
  a 
  large 
  part 
  of 
  it, 
  while 
  the 
  whole 
  

   sides 
  of 
  the 
  thorax 
  may 
  bear 
  similar 
  hairs. 
  In 
  the 
  ^ 
  

   especially, 
  such 
  variations 
  are 
  not 
  easily 
  recognised 
  as 
  

   belonging 
  to 
  the 
  species 
  at 
  all, 
  without 
  critical 
  examina- 
  

   tion, 
  while 
  those 
  of 
  the 
  $ 
  greatly 
  resemble 
  A. 
  angustior. 
  

  

  The 
  bees 
  of 
  the 
  first 
  brood 
  obtain 
  honey 
  and 
  pollen 
  

   from 
  the 
  most 
  varied 
  plants, 
  the 
  dandelion 
  being 
  a 
  great 
  

   favourite, 
  as 
  also 
  are 
  the 
  sallow 
  catkins. 
  But 
  black- 
  

   thorn, 
  fruit-trees, 
  daisies, 
  speedwell, 
  celandine, 
  cabbage, 
  

   starwort, 
  etc., 
  are 
  freely 
  visited. 
  

  

  The 
  second 
  brood 
  shows 
  some 
  peculiarity 
  in 
  its 
  habits. 
  

   In 
  some 
  localities 
  one 
  rarely 
  sees 
  the 
  $ 
  collect 
  its 
  pollen 
  

   from 
  any 
  plants 
  other 
  than 
  Campanula 
  and 
  Malva, 
  the 
  

   two 
  plants 
  which 
  at 
  the 
  same 
  period 
  are 
  resorted 
  to 
  by 
  

   Cilissa 
  haemorrhoidalis, 
  so 
  that 
  the 
  two 
  species 
  are 
  often 
  

   in 
  company. 
  But 
  in 
  other 
  localities 
  the 
  bees 
  of 
  this 
  

   second 
  brood 
  are 
  found 
  abundantly 
  on 
  yellow 
  Compositae 
  

   and 
  on 
  the 
  flowers 
  of 
  Ruhus. 
  Nor 
  does 
  this 
  always 
  appear 
  

   to 
  be 
  due 
  to 
  the 
  absence 
  of 
  the 
  plants 
  first 
  named, 
  for 
  in 
  

   one 
  case 
  a 
  large 
  bed 
  of 
  mallow 
  in 
  full 
  flower, 
  which 
  was 
  

   visited 
  freely 
  by 
  A. 
  coitana, 
  was 
  unnoticed 
  by 
  gwynana, 
  

   although 
  it 
  was 
  common 
  on 
  the 
  yellow 
  Composites 
  and 
  

   blackberry 
  that 
  grew 
  around. 
  

  

  The 
  extremely 
  distinct 
  species 
  of 
  Nomada, 
  N 
  . 
  fabriciana, 
  

   is 
  an 
  abundant 
  parasite 
  of 
  gwynana, 
  and 
  in 
  some 
  localities 
  

   and 
  seasons 
  produces 
  a 
  partial,* 
  more 
  rarely 
  a 
  full 
  second 
  

  

  * 
  By 
  a 
  " 
  partial 
  " 
  second 
  brood 
  1 
  mean 
  that 
  only 
  a 
  small 
  part 
  

   of 
  the 
  progeny 
  of 
  the 
  spring 
  bees 
  emerge 
  in 
  the 
  summer, 
  the 
  rest 
  

   hibernating 
  in 
  the 
  burrows. 
  

  

  