﻿The 
  British 
  Species 
  of 
  Andrena 
  and 
  Nomada. 
  257 
  

  

  describing 
  the 
  (^ 
  of 
  the 
  latter 
  under 
  the 
  name 
  of 
  nigrifrons 
  

   in 
  the 
  first 
  edition 
  of 
  his 
  Catalogue. 
  

  

  This 
  species 
  is 
  very 
  subject 
  to 
  the 
  attack 
  of 
  Stylops, 
  and 
  

   also 
  of 
  Nomada 
  flavoguttata. 
  

  

  A. 
  spreta 
  is 
  much 
  more 
  local 
  than 
  the 
  preceding, 
  and 
  is 
  

   chiefly 
  found 
  on 
  the 
  coast 
  and 
  on 
  or 
  about 
  sandy 
  heaths, 
  

   but 
  rather 
  curiously 
  it 
  occurs 
  also 
  in 
  the 
  fen 
  country 
  in 
  

   Cambridgeshire. 
  It 
  is 
  single-brooded 
  and 
  flies 
  with 
  

   saundersella. 
  So 
  far 
  as 
  I 
  have 
  been 
  able 
  to 
  ascertain 
  from 
  

   a 
  careful 
  investigation 
  of 
  its 
  breeding-grounds, 
  it 
  is 
  not 
  

   attacked 
  by 
  Nomada 
  flavoguttata, 
  but 
  it 
  is 
  very 
  freely 
  

   stylopised. 
  These 
  Uttle 
  bees 
  are 
  very 
  partial 
  to 
  different 
  

   species 
  of 
  Brassica, 
  and 
  freely 
  visit 
  daisies 
  and 
  sometimes 
  

   Veronica. 
  There 
  is 
  no 
  second 
  brood. 
  

  

  A. 
  parvula 
  and 
  tninutida 
  are 
  certainly 
  first 
  and 
  second 
  

   broods 
  of 
  a 
  single 
  species. 
  The 
  first 
  frequents 
  the 
  sallow 
  

   catkins 
  in 
  the 
  earliest 
  days 
  of 
  spring, 
  and 
  gathers 
  abundant 
  

   pollen 
  from 
  blackthorn 
  also, 
  and 
  later 
  from 
  Crataegus 
  and 
  

   Veronica. 
  It 
  is 
  also 
  often 
  found 
  on 
  daisies, 
  dandelion, 
  

   cabbage, 
  mustard, 
  strawberry, 
  flowers 
  of 
  fruit-trees 
  and 
  

   many 
  other 
  plants. 
  The 
  second 
  brood 
  is 
  extremely 
  partial 
  

   to 
  Rubus 
  and 
  various 
  white-flowered 
  UmbelUferae. 
  Though 
  

   sometimes 
  stylopised, 
  this 
  bee 
  is 
  much 
  less 
  subject 
  to 
  attack 
  

   than 
  some 
  of 
  its 
  alhes. 
  I 
  have 
  after 
  careful 
  observations 
  

   been 
  able 
  to 
  satisfy 
  myself 
  that 
  it 
  is 
  also 
  less 
  freely 
  para- 
  

   sitised 
  by 
  Nomada 
  flavoguttata 
  in 
  this 
  country. 
  The 
  species 
  

   seems 
  to 
  be 
  ubiquitous, 
  occurring 
  somewhere, 
  even 
  in 
  the 
  

   poorest 
  locahties. 
  

  

  A. 
  parvuloides 
  and 
  minutuloides 
  may 
  also 
  prove 
  to 
  be 
  

   first 
  and 
  second 
  generations 
  of 
  a 
  single 
  species. 
  They 
  are 
  

   much 
  more 
  local 
  than 
  the 
  preceding, 
  and 
  generally 
  found 
  

   either 
  on 
  the 
  coast, 
  or 
  on 
  or 
  near 
  sandy 
  commons, 
  hardly 
  

   occurring 
  in 
  meadowlands 
  and 
  well-cultivated 
  districts, 
  

   when 
  these 
  are 
  remote 
  from 
  their 
  normal 
  haunts. 
  

  

  If 
  they 
  really 
  are 
  one 
  species, 
  I 
  fuid 
  the 
  second 
  brood 
  

   far 
  more 
  commonly 
  than 
  the 
  first. 
  This 
  latter 
  is 
  found 
  on 
  

   various 
  flowers, 
  Veronica, 
  Brassica, 
  Bellis, 
  etc., 
  but 
  the 
  

   second 
  brood 
  almost 
  entirely 
  restricts 
  its 
  visits 
  to 
  white 
  

   Umbelhferae, 
  and 
  I 
  cannot 
  remember 
  taking 
  it 
  on 
  Rubus, 
  

   which 
  is 
  so 
  attractive 
  to 
  minutula, 
  so 
  that 
  the 
  habits 
  of 
  

   these 
  two 
  very 
  closely 
  alhed 
  forms 
  are 
  somewhat 
  difierent. 
  

  

  I 
  have 
  seen 
  no 
  stylopised 
  example. 
  The 
  males 
  are 
  often 
  

   much 
  more 
  difficult 
  to 
  find 
  than 
  the 
  females, 
  and 
  appear 
  on 
  

   this 
  accomit 
  to 
  be 
  much 
  less 
  numerous, 
  and 
  the 
  species 
  is 
  

  

  TRANS. 
  ENT. 
  SOC. 
  LOND. 
  1919. 
  — 
  PARTS 
  I, 
  ir. 
  (JULY) 
  S 
  

  

  