﻿248 
  Mr. 
  R. 
  C. 
  L. 
  Perkins 
  on 
  

  

  England, 
  as 
  well 
  as 
  in 
  the 
  extreme 
  south. 
  The 
  females 
  

   gather 
  their 
  pollen 
  nearly 
  always 
  from 
  the 
  catkins 
  of 
  sallows, 
  

   but 
  I 
  have 
  taken 
  specimens 
  on 
  dandelion, 
  and 
  have 
  some 
  

   that 
  were 
  captured 
  on 
  Tussilago 
  and 
  TJlex. 
  Though 
  the 
  males 
  

   also 
  visit 
  sallow 
  catkins, 
  they 
  are 
  by 
  no 
  means 
  always 
  found 
  

   on 
  these 
  even 
  when 
  the 
  species 
  is 
  freshly 
  out, 
  and 
  if 
  they 
  are 
  

   present 
  they 
  usually 
  appear 
  to 
  be 
  mostly 
  in 
  search 
  of 
  the 
  

   females, 
  rather 
  than 
  visiting 
  the 
  flowers. 
  

  

  In 
  March 
  and 
  sometimes 
  even 
  in 
  February 
  before 
  any 
  

   new 
  leaves 
  have 
  appeared 
  this 
  sex 
  may 
  be 
  seen 
  flying 
  wildly 
  

   round 
  Ulex 
  or 
  settling 
  on 
  the 
  bare 
  limbs 
  and 
  trunks 
  of 
  trees 
  

   or 
  on 
  dead 
  leaves 
  on 
  the 
  ground, 
  for 
  the 
  purpose 
  of 
  sunning 
  

   themselves. 
  In 
  many 
  and 
  I 
  think 
  in 
  most 
  places 
  where 
  it 
  

   occurs 
  freely, 
  this 
  bee 
  will 
  be 
  found 
  accompanied 
  by 
  its 
  

   parasite 
  Nomada 
  leucophfhahna 
  {horealis), 
  which 
  also 
  visits 
  

   the 
  sallow 
  catkins. 
  This 
  Nomada 
  is 
  not 
  confined 
  to 
  clark- 
  

   ella, 
  but 
  is 
  also 
  attached 
  to 
  A. 
  a/picata, 
  and 
  probably 
  this 
  

   latter 
  is 
  its 
  original 
  host. 
  According 
  to 
  Saunders 
  clarkella 
  

   is 
  found 
  stylopised, 
  but 
  only 
  rarely. 
  

  

  A.fulva 
  is 
  in 
  the 
  female 
  sex 
  the 
  most 
  beautiful 
  of 
  all 
  our 
  

   Andrenas. 
  It 
  is 
  a 
  local 
  bee 
  entirely 
  absent 
  from 
  many 
  dis- 
  

   tricts, 
  but 
  generally 
  abundant, 
  where 
  it 
  occurs 
  at 
  all. 
  Owing 
  

   to 
  its 
  partiality 
  for 
  the 
  flowering 
  fruit-trees 
  it 
  is 
  a 
  constant 
  

   inhabitant 
  of 
  gardens 
  in 
  places 
  where 
  it 
  is 
  found, 
  and 
  is 
  not 
  

   easily 
  overlooked 
  for 
  that 
  reason, 
  and 
  because 
  its 
  burrows 
  

   are 
  often 
  conspicuous 
  on 
  lawns. 
  It 
  may 
  be 
  taken 
  on 
  the 
  cat- 
  

   kins 
  of 
  Salix, 
  and 
  is 
  very 
  abundant 
  away 
  from 
  gardens 
  on 
  the 
  

   flowers 
  of 
  blackthorn, 
  and 
  occurs, 
  too, 
  on 
  Cotoneaster, 
  Ulex 
  

   and 
  various 
  other 
  plants. 
  Its 
  colonies 
  are 
  often 
  large 
  and 
  

   compact, 
  occupying 
  trodden 
  pathways 
  on 
  sandy 
  commons 
  

   for 
  many 
  yards 
  together. 
  A 
  large 
  form 
  of 
  Nomada 
  rvfi- 
  

   cornis 
  s.s. 
  infests 
  its 
  burrows, 
  and 
  it 
  also 
  has 
  as 
  a 
  special 
  

   parasite 
  iV. 
  signafa, 
  which 
  some 
  hymenopterists 
  consider 
  

   to 
  be 
  also 
  a 
  variety 
  of 
  ruficornis. 
  In 
  some 
  localities, 
  e.g., 
  

   at 
  Oxford, 
  only 
  rvficornis 
  appears 
  to 
  be 
  found 
  with 
  it; 
  in 
  

   others, 
  e.g., 
  at 
  Raglan 
  in 
  Monmouthshire, 
  only 
  signaia; 
  

   but 
  on 
  some 
  of 
  the 
  commons 
  in 
  the 
  neighbourhood 
  of 
  

   London 
  both 
  these 
  species 
  are 
  found 
  at 
  its 
  burrows. 
  

  

  Stylopised 
  specimens 
  of 
  A.fulva 
  are 
  rare, 
  or, 
  at 
  least, 
  

   very 
  local, 
  but 
  are 
  to 
  be 
  found 
  on 
  the 
  commons 
  near 
  London. 
  

   Males 
  thus 
  affected 
  often 
  have 
  an 
  extraordinary 
  appearance, 
  

   being 
  very 
  greatly 
  changed 
  by 
  the 
  parasite. 
  

  

  A. 
  varians 
  has 
  much 
  the 
  habits 
  of 
  the 
  preceding 
  ; 
  indeed, 
  

   the 
  two 
  species 
  are 
  often 
  found 
  in 
  the 
  same 
  localities, 
  and 
  both 
  

  

  