﻿260 
  Mr. 
  R. 
  C. 
  L. 
  Perkins 
  on 
  

  

  A, 
  wilkella 
  is 
  of 
  very 
  different 
  distribution 
  from 
  that 
  of 
  

   the 
  preceding, 
  since 
  it 
  often 
  occurs 
  in 
  extraordinary 
  num- 
  

   bers 
  on 
  heavy 
  clay 
  soils 
  and 
  in 
  highly 
  cultivated 
  meadow- 
  

   lands. 
  It 
  is 
  true 
  that 
  it 
  is 
  found 
  not 
  infrequently 
  in 
  the 
  

   same 
  localities, 
  frequenting 
  exactly 
  the 
  same 
  flowers 
  as 
  

   ovatida 
  and 
  similis, 
  but 
  where 
  these 
  two 
  species 
  are 
  most 
  

   abundant 
  wilkella 
  is 
  often 
  inferior 
  to 
  them 
  in 
  numbers. 
  

   N. 
  hillana 
  {ochrostoma) 
  is 
  its 
  special 
  parasite, 
  and 
  does 
  not 
  

   appear 
  to 
  affect 
  the 
  others. 
  Sometimes 
  the 
  Andrena 
  forms 
  

   colonies 
  of 
  huge 
  extent 
  and 
  very 
  compact, 
  at 
  others 
  its 
  

   burrows 
  are 
  scattered 
  over 
  a 
  large 
  extent 
  of 
  land. 
  We 
  

   have 
  seen 
  tennis 
  lawns 
  covered 
  with 
  little 
  hillocks 
  of 
  soil 
  

   thrown 
  up 
  by 
  these 
  bees 
  in 
  the 
  same 
  way 
  as 
  A.fulva 
  is 
  

   well 
  known 
  to 
  do 
  in 
  similar 
  places, 
  where 
  the 
  soil 
  is 
  

   lighter. 
  

  

  Stylopised 
  specimens 
  are 
  very 
  common, 
  and 
  females 
  

   affected 
  by 
  the 
  parasite 
  are 
  often 
  found 
  in 
  dandelions, 
  even 
  

   when 
  few 
  healthy 
  ones 
  are 
  to 
  be 
  seen 
  on 
  those 
  flowers. 
  

   It 
  is 
  always 
  single-brooded, 
  and 
  though 
  both 
  fly 
  together, 
  

   it 
  appears 
  rather 
  later 
  than 
  ovatula 
  under 
  normal 
  conditions 
  

   of 
  weather. 
  

  

  There 
  remain 
  to 
  be 
  considered 
  those 
  species, 
  which 
  have 
  

   the 
  clypeus 
  in 
  the 
  ^ 
  white, 
  and 
  along 
  with 
  these 
  one 
  

   without 
  that 
  peculiarity, 
  but 
  evidently 
  closely 
  related 
  to 
  

   one 
  of 
  the 
  others. 
  

  

  This 
  black-faced 
  little 
  bee, 
  A. 
  nitidiuscula 
  {lucens), 
  is 
  

   amongst 
  the 
  most 
  local 
  of 
  all 
  our 
  species, 
  being 
  restricted 
  

   to 
  a 
  few 
  southern 
  counties, 
  but 
  almost 
  certain 
  to 
  occur 
  in 
  at 
  

   least 
  one 
  or 
  two 
  others 
  from 
  which 
  it 
  is 
  not 
  yet 
  recorded. 
  

   It 
  is 
  fomid 
  on 
  heaths 
  or 
  commons 
  in 
  Surrey, 
  Sussex 
  and 
  

   Dorset 
  flying 
  over 
  the 
  heather, 
  the 
  $ 
  visiting 
  the 
  black- 
  

   berry 
  blossoms. 
  On 
  the 
  Continent 
  it 
  is 
  said 
  to 
  be 
  partial 
  

   to 
  Umbelliferae, 
  as 
  its 
  ally 
  A. 
  chrysosceles 
  is 
  with 
  us. 
  This 
  

   latter 
  is 
  a 
  more 
  or 
  less 
  local 
  species, 
  but 
  occurs 
  at 
  times 
  in 
  

   the 
  utmost 
  profusion. 
  It 
  is 
  on 
  the 
  whole 
  more 
  pailial 
  

   to 
  meadowland 
  than 
  to 
  more 
  barren 
  localities. 
  It 
  is 
  fomid 
  

   near 
  London 
  and 
  probably 
  in 
  all 
  or 
  nearly 
  all 
  the 
  southern 
  

   counties, 
  either 
  locally 
  or 
  generally 
  distributed, 
  in 
  Cam- 
  

   bridge, 
  Essex, 
  Suffolk 
  and 
  Norfolk 
  in 
  the 
  east, 
  in 
  Gloucester- 
  

   shire, 
  Devon 
  and 
  Monmouthshire 
  in 
  the 
  west, 
  in 
  Dorset 
  

   Berks 
  and 
  Hants, 
  Oxford 
  and 
  Warwick, 
  and 
  in 
  

   Glamorgan, 
  and 
  no 
  doubt 
  other 
  Welsh 
  counties. 
  Though 
  

   not 
  one 
  of 
  the 
  earliest 
  bees, 
  in 
  forward 
  seasons 
  it 
  may 
  appear 
  

   in 
  April, 
  and 
  is 
  commonly 
  found 
  from 
  May 
  into 
  June, 
  and 
  

  

  