﻿;',1J 
  Mr. 
  T. 
  1). 
  A. 
  Cockerell 
  — 
  Descriptions 
  and 
  

  

  E. 
  Turner 
  examined 
  It 
  female 
  specimens 
  in 
  his 
  collection, 
  

   and 
  all 
  had 
  13-jointed 
  antennae 
  and 
  wholly 
  lacked 
  a 
  ventral 
  

   scopa. 
  It 
  is 
  therefore 
  certain 
  thai, 
  this 
  is 
  a 
  normal 
  condition, 
  

   and 
  must 
  represent 
  an 
  early 
  stage 
  in 
  the 
  evolution 
  of 
  a 
  

   parasitic 
  series, 
  like 
  those 
  of 
  Ca'lio.vys 
  and 
  Stelis. 
  From 
  the 
  

   standpoint 
  ot 
  genetics, 
  it 
  is 
  an 
  extraordinary 
  case, 
  since 
  the 
  

   female 
  seems 
  to 
  have 
  dropped 
  her 
  secondary 
  sexual 
  characters 
  

   and 
  thereby 
  assumed 
  those 
  of 
  the 
  male, 
  which 
  were 
  present 
  

   in 
  her 
  gametic 
  constitution. 
  It 
  is 
  noteworthy 
  that 
  the 
  sting, 
  

   :i 
  modified 
  primary 
  character, 
  is 
  retained. 
  It 
  appears 
  that 
  

   in 
  Megachile 
  the 
  female 
  is 
  heterozygous 
  for 
  the 
  secondary 
  

   sexual 
  characters, 
  with 
  the 
  female 
  characters 
  dominant. 
  

  

  Thus 
  a 
  new 
  generic 
  type 
  has 
  been 
  produced 
  by 
  the 
  simple 
  

   dropping 
  out 
  of 
  one 
  set 
  of 
  characters. 
  It 
  may 
  be 
  objected 
  

   that 
  the 
  insect 
  is 
  still 
  essentially 
  a 
  Megachile, 
  and 
  this 
  is 
  in- 
  

   deed 
  true 
  as 
  regards 
  its 
  major 
  characters, 
  but 
  according 
  to 
  

   any 
  logical 
  system 
  of 
  classification 
  it 
  must 
  go 
  in 
  a 
  distinct 
  

   generic 
  group, 
  as 
  otherwise 
  our 
  current 
  definition 
  of 
  Mega- 
  

   chile, 
  applicable 
  to 
  hundreds 
  of 
  species 
  all 
  over 
  the 
  world, 
  

   breaks 
  down. 
  

  

  Mr. 
  Turner 
  sends 
  me 
  the 
  male 
  of 
  A. 
  detersa, 
  taken 
  at 
  the 
  ' 
  

   same 
  tree 
  as 
  the 
  female, 
  and 
  having 
  the 
  same 
  general 
  

   characters. 
  

  

  Male. 
  — 
  Length 
  about 
  8 
  mm. 
  Eyes 
  green 
  ; 
  face 
  with 
  

   abundant 
  pale 
  yellow 
  hair; 
  third 
  antennal 
  joint 
  (as 
  

   Mr. 
  Turner 
  noted) 
  oblique 
  at 
  end 
  us 
  in 
  the 
  female 
  j 
  lower 
  

   part 
  of 
  checks 
  with 
  very 
  abundant 
  snow-white 
  hair 
  ; 
  anterior 
  

   coxae 
  with 
  short 
  Hat 
  spines 
  ; 
  anterior 
  tarsi 
  reddish, 
  the 
  first 
  

   three 
  joints 
  oval, 
  flattened, 
  especially 
  the 
  first„so 
  that 
  the 
  

   posterior 
  margin 
  of 
  the 
  tarsus 
  is 
  strongly 
  eremite, 
  the 
  tarsus 
  

   also 
  with 
  a 
  strong 
  fringe 
  of 
  white 
  hair 
  behind; 
  middle 
  and 
  

   hind 
  tarsi 
  also 
  somewhat 
  thickened, 
  middle 
  tarsi 
  with 
  a 
  very 
  

   long 
  fringe 
  of 
  white 
  hair 
  behind 
  ; 
  hind 
  tibia 
  swollen 
  ; 
  vertex 
  

   and 
  thorax 
  above 
  with 
  a 
  good 
  deal 
  of 
  black 
  hair; 
  abdomen 
  

   short, 
  with 
  narrow' 
  hair-bands, 
  the 
  apex 
  strongly 
  retracted; 
  

   dorsal 
  surface 
  of 
  sixth 
  segment 
  densely 
  covered 
  with 
  cream- 
  

   coloured 
  hair, 
  margin 
  of 
  segment 
  little 
  projecting, 
  with 
  a 
  

   broad 
  shallow 
  median 
  depression 
  ; 
  no 
  ventral 
  teeth 
  or 
  spines 
  ; 
  

   claws 
  bifid 
  at 
  end. 
  The 
  claws 
  are 
  also 
  bifid 
  at 
  end 
  in 
  the 
  

   female, 
  with 
  no 
  basal 
  tooth. 
  

  

  Heriades 
  sauteri, 
  sp. 
  n. 
  

  

  $ 
  . 
  — 
  Length 
  about 
  6^ 
  mm. 
  

  

  Black, 
  superficially 
  looking 
  exactly 
  like 
  the 
  European 
  

   //. 
  truncorum 
  (L.), 
  to 
  which 
  it 
  is 
  closely 
  allied, 
  differing 
  as 
  

  

  