﻿272 
  Mr. 
  E. 
  C. 
  L. 
  Perkins 
  on 
  

  

  part 
  at 
  least 
  of 
  the 
  surface 
  of 
  the 
  lobes 
  of 
  the 
  genital 
  

   armature. 
  The 
  armature 
  itself 
  in 
  its 
  general 
  form 
  is 
  

   commonplace, 
  the 
  inner 
  angles 
  of 
  the 
  lobes 
  of 
  the 
  stipites 
  

   either 
  subrectangular 
  or 
  slightly 
  produced. 
  The 
  head 
  is 
  

   without 
  special 
  characters, 
  and 
  the 
  3rd 
  antennal 
  joint 
  is 
  

   about 
  equal 
  to 
  the 
  next 
  two 
  together. 
  The 
  abdomen 
  

   beneath 
  has 
  a 
  general 
  clothing 
  of 
  long 
  hairs, 
  and 
  no 
  special 
  

   dense 
  ciliation 
  at 
  the 
  apices 
  of 
  the 
  segments. 
  

  

  Andrena 
  florea. 
  

  

  The 
  position 
  of 
  this 
  species 
  is 
  uncertain, 
  the 
  male 
  genital 
  

   armature 
  being 
  very 
  remarkable. 
  The 
  sparsely 
  clothed, 
  

   shining 
  and 
  clearly 
  punctured 
  abdomen, 
  which 
  is 
  usually 
  

   more 
  or 
  less 
  marked 
  with 
  red 
  is 
  characteristic 
  of 
  both 
  

   sexes. 
  The 
  pygidial 
  area 
  is 
  of 
  the 
  simple 
  or 
  flat 
  form. 
  

   Even 
  if 
  it 
  cannot 
  be 
  included 
  in 
  either, 
  it 
  is 
  clear 
  that 
  this 
  

   species 
  comes 
  close 
  to 
  the 
  group 
  of 
  flavipes 
  and 
  to 
  that 
  of 
  

   nigroaenea. 
  It 
  is 
  more 
  remote 
  from 
  the 
  group 
  of 
  trim- 
  

   merana. 
  The 
  ventral 
  segments 
  of 
  the 
  ^ 
  have 
  a 
  specialised 
  

   apical 
  cihation, 
  and 
  the 
  fioccus 
  of 
  the 
  $ 
  is 
  not 
  perfect. 
  

  

  Group 
  of 
  A. 
  NIGROAENEA. 
  

  

  This 
  group 
  is 
  typically 
  represented 
  by 
  nigroaenea, 
  nitida, 
  

   thoracwa, 
  cineraria, 
  vaga; 
  less 
  typically 
  by 
  gwynana 
  and 
  

   probably 
  ruficrus, 
  and 
  with 
  these 
  may 
  be 
  included 
  the 
  

   more 
  aberrant 
  angustior. 
  

  

  The 
  species 
  are 
  chiefly 
  distinguished 
  by 
  negative 
  char- 
  

   acters. 
  In 
  the 
  males 
  the 
  head 
  is 
  never 
  of 
  striking 
  form, 
  

   and 
  the 
  labrum 
  is 
  ordinary, 
  not 
  upturned, 
  the 
  mandibles 
  

   never 
  armed 
  with 
  a 
  tooth 
  at 
  the 
  base, 
  nor 
  are 
  the 
  lower 
  

   occipital 
  angles 
  acutely 
  produced 
  backwards. 
  The 
  second 
  

   abdominal 
  segment 
  in 
  fresh 
  examples 
  has 
  some 
  distinct 
  

   pubescence 
  extending 
  to 
  the 
  middle 
  either 
  in 
  front 
  or 
  

   posteriorly 
  or 
  on 
  the 
  disc, 
  or 
  else 
  the 
  first 
  segment 
  has 
  

   long 
  hairs 
  not 
  confined 
  merely 
  to 
  the 
  sides. 
  These 
  hairs, 
  

   however, 
  are 
  so 
  thin 
  and 
  sparse 
  in 
  several 
  species 
  that 
  

   they 
  are 
  easily 
  abraded. 
  There 
  is 
  no 
  conspicuous 
  adorn- 
  

   ment 
  formed 
  by 
  minute 
  dense 
  hairs 
  forming 
  apical 
  pale 
  

   bands 
  or 
  lateral 
  streaks 
  on 
  the 
  dorsal 
  abdominal 
  segments.* 
  

   In 
  the 
  females 
  the 
  fioccus 
  is 
  never 
  perfect, 
  though 
  in 
  

   cineraria 
  and 
  ovina 
  it 
  is 
  nearly 
  so, 
  and 
  the 
  appressed 
  hairs 
  

  

  * 
  Apparently 
  a 
  slight 
  appearance 
  of 
  this 
  is 
  found 
  in 
  ruficrus 
  and 
  

   in 
  some 
  specimens 
  of 
  the 
  second 
  brood 
  of 
  gwynana. 
  

  

  