﻿280 
  Mr. 
  K. 
  C. 
  L. 
  Perkins 
  on 
  

  

  the 
  mandibles 
  longer 
  and 
  forming 
  a 
  distinct 
  cross 
  at 
  the 
  

   tips 
  in 
  some 
  aspects, 
  while 
  the 
  hind 
  tibiae 
  are 
  long 
  and 
  

   slender. 
  

  

  In 
  tarsata 
  $ 
  the 
  hind 
  tibiae 
  are 
  comparatively 
  strongly 
  

   clavate, 
  very 
  wide 
  at 
  the 
  apex, 
  the 
  scopal 
  fringe 
  dense 
  

   above 
  them, 
  and 
  its 
  longest 
  hairs 
  appear 
  only 
  about 
  half 
  

   the 
  width 
  of 
  the 
  tibiae 
  at 
  their 
  apex. 
  The 
  floccus 
  is 
  

   imperfect, 
  the 
  hairs 
  on 
  the 
  ' 
  basal 
  part 
  of 
  the 
  trochanter 
  

   much 
  stiiier 
  and 
  straighter 
  than 
  the 
  apical 
  ones. 
  

  

  In 
  coitana 
  $ 
  the 
  hind 
  tibiae 
  are 
  slender, 
  with 
  a 
  very 
  

   long 
  and 
  less 
  dense 
  scopal 
  fringe 
  above, 
  the 
  longest 
  hairs 
  

   appearing 
  about 
  equal 
  in 
  length 
  to 
  the 
  width 
  of 
  the 
  apex 
  

   of 
  the 
  tibiae. 
  The 
  polhnigerous 
  basket 
  at 
  the 
  sides 
  of 
  the 
  

   propodeum 
  is 
  quite 
  rudimentary 
  (in 
  tarsata 
  it 
  is 
  very 
  fairly 
  

   devetoped), 
  but 
  the 
  floccus 
  is 
  perfect 
  in 
  form. 
  

  

  A. 
  marginata 
  [cetii) 
  is 
  not 
  at 
  all 
  closely 
  allied 
  to 
  hattor- 
  

   fiana, 
  next 
  to 
  which 
  it 
  is 
  placed, 
  and 
  with 
  which 
  it 
  agrees 
  

   in 
  its 
  habits 
  and 
  variabihty 
  of 
  coloration. 
  

  

  Head 
  of 
  (^ 
  deeply 
  emarginate 
  and 
  the 
  lower 
  occipital 
  

   angles 
  rather 
  strongly 
  produced 
  baclcwards, 
  but 
  not 
  at 
  

   all 
  sharp. 
  Apical 
  margin 
  of 
  clypeus 
  with 
  the 
  lateral 
  angles 
  

   forming 
  strong 
  prominent 
  teeth, 
  the 
  tubercle 
  of 
  the 
  labrum 
  

   very 
  wide, 
  upturned 
  above 
  the 
  clypeal 
  margin 
  between 
  

   the 
  teeth 
  of 
  which 
  it 
  forms 
  a 
  well-curved 
  outline. 
  Mandibles 
  

   long 
  and 
  slender 
  crossing 
  at 
  tips. 
  Propodeum 
  at 
  sides 
  of 
  

   the 
  area 
  with 
  long 
  hairs. 
  Abdomen 
  with 
  dense 
  special 
  

   cihation 
  on 
  the 
  ventral 
  segments. 
  Genital 
  armature 
  small, 
  

   inner 
  apical 
  angles 
  of 
  lobes 
  of 
  stipites 
  not 
  the 
  least 
  pro- 
  

   duced, 
  but 
  obtuse, 
  sagittae 
  very 
  narrow 
  at 
  the 
  base. 
  

  

  Female 
  well 
  clothed 
  with 
  long 
  hairs 
  on 
  the 
  parts 
  adjoin- 
  

   ing 
  the 
  anterior 
  area 
  of 
  the 
  propodeum; 
  floccus 
  rather 
  

   thin 
  but 
  perfect, 
  all 
  the 
  hairs 
  very 
  slender 
  and 
  plumose; 
  

   hind 
  tibiae 
  slender, 
  with 
  very 
  long 
  scopal 
  fringe 
  above, 
  

   this 
  being 
  also 
  som.ewhat 
  lax. 
  

  

  A. 
  Jiattorjiana. 
  Head 
  ordinary, 
  clypeus 
  not 
  produced 
  

   into 
  strong 
  prominent 
  teeth 
  on 
  each 
  side, 
  the 
  tubercle 
  of 
  

   the 
  labrum 
  not 
  upturned, 
  emarginate 
  apically. 
  Ventral 
  

   abdominal 
  segments 
  with 
  a 
  speciahsed 
  and 
  dense 
  apical 
  

   ciliation. 
  Inner 
  angle 
  of 
  lobes 
  of 
  stipites 
  strongly 
  pro- 
  

   duced, 
  the 
  production 
  obliquely 
  truncate 
  or 
  feebly 
  rounded 
  

   at 
  the 
  apex. 
  Hind 
  tibiae 
  somewhat 
  strongly 
  clavate. 
  

  

  Female 
  with 
  the 
  surface 
  of 
  the 
  propodeum 
  adjoining 
  the 
  

   anterior 
  area 
  sparsely 
  clothed, 
  the 
  lateral 
  pollen-basket 
  

   very 
  rudimentary, 
  much 
  as 
  in 
  coitana, 
  Scopal 
  fringe 
  

  

  