﻿xlii 
  

  

  of 
  both 
  genera, 
  and 
  various 
  kinds 
  of 
  breeding 
  places 
  whicli 
  

   they 
  affect, 
  especially 
  in 
  Africa, 
  drawing 
  special 
  attention 
  to 
  

   comparative 
  illustrations 
  of 
  the 
  resting 
  positions 
  of 
  both 
  

   genera, 
  and 
  the 
  difference 
  in 
  the 
  appearance 
  of 
  the 
  proboscis. 
  

  

  Androconia 
  in 
  a 
  Bee. 
  

  

  The 
  Rev. 
  F. 
  D, 
  Morice, 
  in 
  exhibiting 
  photographs 
  with 
  the 
  

   Epidiascope, 
  said 
  that 
  in 
  May 
  1918 
  he 
  had 
  shown 
  three 
  photo- 
  

   graphs 
  (afterwards 
  reproduced 
  in 
  Plate 
  XI 
  of 
  the 
  Society's 
  

   Transactions 
  for 
  that 
  year) 
  of 
  some 
  aggregations 
  of 
  scale-like 
  

   hairs, 
  which 
  he 
  had 
  thought 
  might 
  probably 
  be 
  " 
  androconia," 
  

   occurring 
  in 
  <^(^ 
  only 
  of 
  certain 
  Australian 
  sawflies 
  belonging 
  

   to 
  the 
  genus 
  Perga, 
  on 
  the 
  undersides 
  either 
  of 
  all 
  the 
  wings 
  

   (P. 
  castanea), 
  or 
  of 
  the 
  front 
  pair 
  only 
  (P. 
  polita 
  and 
  others). 
  

  

  He 
  had 
  since, 
  acting 
  on 
  a 
  suggestion 
  made 
  to 
  him 
  in 
  a 
  letter 
  

   from 
  Prof. 
  Cockerell, 
  compared 
  with 
  these 
  structures 
  some- 
  

   thing 
  apparently 
  similar 
  which 
  appears, 
  in 
  the 
  fore-wings 
  

   only, 
  of 
  an 
  exotic 
  genus 
  of 
  Bees, 
  viz. 
  Thrincostoma, 
  Sauss., 
  

   first 
  described 
  from 
  Madagascar, 
  but 
  represented 
  also 
  in 
  the 
  

   Collections 
  of 
  the 
  British 
  Museum 
  of 
  Natural 
  History 
  by 
  

   several 
  species 
  from 
  S. 
  Africa 
  and 
  the 
  Oriental 
  Region 
  (Borneo, 
  

   etc.). 
  As 
  with 
  Perga, 
  the 
  structure 
  occurs 
  only 
  in 
  (^^. 
  It 
  differs 
  

   from 
  those 
  to 
  be 
  found 
  in 
  the 
  above 
  Sawflies, 
  in 
  occupying 
  a 
  

   slightly 
  different 
  and 
  smaller 
  part 
  of 
  the 
  wing 
  (being 
  confined 
  

   to 
  the 
  cubital 
  area), 
  and 
  situate 
  on 
  its 
  upper, 
  and 
  not, 
  as 
  in 
  

   Perga, 
  on 
  its 
  under 
  side. 
  It 
  is, 
  however, 
  large 
  and 
  dense 
  

   enough 
  to 
  be 
  seen 
  with 
  the 
  naked 
  eye; 
  and 
  when 
  magnified 
  

   appears 
  as 
  an 
  oval 
  patch 
  of 
  long 
  hairs, 
  irregularly 
  matted 
  

   together 
  into 
  a 
  sort 
  of 
  oval 
  " 
  mask 
  " 
  lying 
  across 
  the 
  middle 
  

   of 
  the 
  second 
  cubital 
  nerve, 
  which 
  seems 
  to 
  be 
  distorted 
  at 
  

   this 
  point, 
  viz. 
  bent 
  twice 
  abruptly 
  (almost 
  at 
  right 
  angles) 
  

   above 
  and 
  below 
  the 
  centre 
  of 
  the 
  mask. 
  Some 
  of 
  the 
  hairs 
  

   appear 
  to 
  be 
  simple, 
  differing 
  only 
  in 
  length 
  from 
  the 
  general 
  

   microscopic 
  pilosity 
  of 
  the 
  wing-surface. 
  But 
  others 
  are 
  

   evidently 
  much 
  modified, 
  flattened 
  and 
  dilated 
  (more 
  on 
  one 
  

   side 
  than 
  the 
  other) 
  from 
  their 
  middles 
  towards 
  their 
  sharply 
  

   pointed 
  apices 
  (i. 
  e. 
  asymmetrically 
  lanceolate), 
  while 
  their 
  

   basal 
  halves 
  appear 
  simply 
  cylindrical 
  and 
  slender 
  throughout, 
  

   except 
  for 
  a 
  slight 
  bulb-like 
  swelling 
  where 
  they 
  emerge 
  from 
  

  

  