﻿238 
  Mr. 
  R. 
  C. 
  L. 
  Perkins 
  on 
  

  

  The 
  changes 
  produced 
  by 
  Stylops 
  are 
  sometimes 
  so 
  

   considerable 
  that 
  stylopised 
  examples 
  will 
  not 
  agree 
  with 
  

   the 
  characters 
  given 
  for 
  the 
  separation 
  of 
  the 
  species, 
  but 
  

   I 
  have 
  never 
  yet 
  come 
  across 
  any 
  so 
  changed 
  that 
  the 
  

   species 
  could 
  not 
  be 
  determined 
  with 
  certainty. 
  

  

  Habits 
  and 
  Distribution 
  of 
  British 
  Species. 
  

  

  We 
  may 
  now 
  consider 
  the 
  species 
  in 
  order 
  from 
  the 
  point 
  

   of 
  view 
  of 
  their 
  habits, 
  and 
  the 
  parasites 
  that 
  affect 
  them. 
  

  

  A. 
  albicans 
  is 
  perhaps 
  the 
  most 
  generally 
  common 
  of 
  

   the 
  whole 
  genus, 
  and 
  is 
  said 
  by 
  Smith 
  to 
  occur 
  also 
  in 
  

   N. 
  America. 
  It 
  frequents 
  many 
  flowers, 
  and 
  in 
  the 
  earliest 
  

   warm 
  spring 
  days 
  may 
  be 
  seen 
  in 
  numbers 
  collecting 
  its 
  

   store 
  or 
  feeding 
  on 
  the 
  sallow 
  catkins 
  and 
  dandelion 
  

   blossoms. 
  It 
  abounds 
  in 
  gardens 
  on 
  the 
  flowers 
  of 
  larger 
  

   fruit-trees, 
  on 
  gooseberry, 
  Cotoneaster 
  ; 
  also 
  on 
  Crataegus, 
  

   Viburnum, 
  Euphorbia 
  and 
  many 
  other 
  plants. 
  In 
  most 
  

   southern 
  localities 
  it 
  is 
  parasitised 
  by 
  Nomada 
  bifida, 
  

   which 
  also 
  occurs 
  with 
  it 
  in 
  the 
  north, 
  and 
  has 
  been 
  taken, 
  

   entering 
  its 
  burrows, 
  in 
  all 
  parts 
  of 
  the 
  country, 
  showing 
  

   a 
  distribution 
  as 
  wide 
  as 
  that 
  of 
  its 
  host. 
  

  

  A. 
  carbonaria 
  {pilipes) 
  is 
  a 
  local 
  species 
  very 
  partial 
  to 
  

   the 
  coast, 
  but 
  also 
  found 
  far 
  inland, 
  as 
  at 
  Oxford. 
  It 
  

   sometimes 
  forms 
  large 
  and 
  very 
  compact 
  colonies 
  in 
  cUfEs, 
  

   and* 
  I 
  have 
  noticed 
  them 
  so 
  near 
  the 
  foot 
  of 
  these 
  as 
  to 
  be 
  

   constantly 
  damped 
  by 
  the 
  sea 
  spray 
  at 
  high 
  tide. 
  In 
  the 
  

   south 
  it 
  regTilarly 
  has 
  a 
  full 
  second 
  brood, 
  but 
  at 
  Oxford 
  

   apparently 
  only 
  one 
  as 
  a 
  rule. 
  The 
  first 
  brood 
  visits 
  

   catkins 
  of 
  Salix 
  and 
  is 
  very 
  partial 
  to 
  blackthorn, 
  and 
  is 
  

   also 
  found 
  more 
  or 
  less 
  commonly 
  on 
  dandelions, 
  cabbage 
  

   and 
  mustard, 
  on 
  hawthorn, 
  Euphorbia, 
  and 
  other 
  plants. 
  

   The 
  second 
  brood 
  is 
  extremely 
  partial 
  to 
  pink 
  thistle 
  

   and 
  blackberry 
  flowers. 
  I 
  have 
  rarely, 
  only 
  twice 
  or 
  three 
  

   times, 
  found 
  it 
  stylopised, 
  and 
  as 
  often 
  have 
  taken 
  Nomada 
  

   lineola 
  entering 
  its 
  burrows. 
  

  

  A. 
  tibialis 
  is 
  a 
  local 
  species, 
  its 
  abundance 
  in 
  many 
  

   localities 
  around 
  London 
  having, 
  no 
  doubt, 
  led 
  to 
  its 
  being 
  

   considered 
  more 
  generally 
  common 
  than 
  is 
  really 
  the 
  case. 
  

   Over 
  a 
  large 
  extent 
  of 
  country 
  in 
  Gloucestershire, 
  Wiltshire 
  

   and 
  Devonshire, 
  for 
  instance, 
  it 
  is 
  entirely 
  absent, 
  as 
  is 
  

   probably 
  the 
  case 
  in 
  many 
  other 
  counties 
  even 
  in 
  the 
  south, 
  

   even 
  though 
  it 
  may 
  occur 
  locally 
  in 
  them. 
  Unless 
  actual 
  

   colonies 
  be 
  found, 
  the 
  females 
  in 
  my 
  experience 
  form 
  

  

  