﻿206 
  Transactions. 
  — 
  Zoology, 
  

  

  the 
  third, 
  fourth, 
  and 
  seventh 
  the 
  longest, 
  and 
  about 
  equal 
  to 
  one 
  another 
  ; 
  

   the 
  fifth 
  and 
  sixth 
  somewhat 
  shorter. 
  There 
  are 
  a 
  very 
  few 
  hairs 
  on 
  most 
  

   of 
  the 
  joints, 
  but 
  the 
  seventh 
  has 
  a 
  good 
  number. 
  

  

  The 
  feet 
  are 
  moderately 
  long 
  ; 
  the 
  coxa 
  thick, 
  the 
  femur 
  moderately 
  

   large 
  and 
  about 
  the 
  same 
  length 
  as 
  the 
  tibia 
  which 
  is 
  somewhat 
  thinner, 
  

   the 
  tarsus 
  still 
  narrower, 
  tapering 
  to 
  the 
  claw. 
  The 
  upper 
  pair 
  of 
  digitules 
  

   above 
  the 
  claw 
  are 
  pretty 
  long, 
  ending 
  in 
  a 
  very 
  small 
  knob 
  ; 
  the 
  lower 
  pair 
  

   are 
  about 
  twice 
  the 
  length 
  of 
  the 
  claw, 
  very 
  broad. 
  

  

  The 
  general 
  outline 
  of 
  the 
  body 
  (fig. 
  12c) 
  is 
  oval, 
  but 
  varying 
  in 
  eccentri- 
  

   city. 
  On 
  the 
  holly 
  and 
  ivy 
  in 
  our 
  gardens 
  it 
  forms 
  a 
  pretty 
  regular 
  ellipse 
  ; 
  

   on 
  the 
  Portugal 
  laurel 
  it 
  is 
  more 
  elongated 
  ; 
  on 
  the 
  orange 
  nearly 
  circular. 
  

   It 
  is 
  covered 
  with 
  minute 
  specks, 
  and 
  a 
  row 
  of 
  small 
  hairs, 
  not 
  very 
  close 
  

   together, 
  runs 
  round 
  the 
  edge. 
  There 
  are 
  four 
  stigmata, 
  as 
  shown 
  in 
  plate 
  

   VI., 
  fig. 
  10c, 
  and 
  opposite 
  each, 
  at 
  the 
  edge, 
  is 
  a 
  depression 
  with 
  three 
  

   strong 
  spines, 
  of 
  which 
  the 
  middle 
  one 
  is 
  much 
  longer 
  than 
  the 
  other 
  two. 
  

   At 
  certain 
  stages 
  of 
  the 
  life 
  of 
  the 
  insect, 
  on 
  lifting 
  it 
  from 
  the 
  leaf, 
  cottony 
  

   trails 
  may 
  be 
  seen 
  on 
  the 
  plant 
  marking 
  the 
  position 
  of 
  these 
  stigmata, 
  an 
  

   appearance 
  usual, 
  according 
  to 
  Signoret, 
  amongst 
  the 
  Lecanidffi. 
  

  

  The 
  male 
  of 
  this 
  species 
  is 
  unknown. 
  

  

  Lecanium 
  hesjjeridum 
  is 
  said 
  to 
  be 
  always 
  viviparous. 
  In 
  the 
  Diaspidae, 
  

   the 
  female 
  lays 
  her 
  eggs 
  in 
  a 
  prepared 
  nest 
  ; 
  in 
  the 
  Lecanie^e 
  she 
  becomes 
  

   herself 
  the 
  nest 
  of 
  her 
  young. 
  About 
  April, 
  in 
  this 
  country, 
  on 
  turning 
  

   over 
  one 
  of 
  the 
  females, 
  it 
  will 
  be 
  seen 
  that 
  on 
  the 
  under 
  side 
  of 
  the 
  body, 
  

   there 
  is 
  a 
  broad 
  deep-red 
  cavity, 
  between 
  which 
  and 
  the 
  leaf 
  numerous 
  

   young 
  ones 
  run 
  briskly 
  about. 
  Inserting 
  the 
  insect 
  into 
  some 
  transparent 
  

   fluid, 
  such 
  as 
  glycerine 
  or 
  balsam, 
  the 
  body 
  is 
  seen 
  to 
  be 
  full 
  of 
  eggs 
  ; 
  but, 
  

   with 
  the 
  exception 
  of 
  some 
  minute 
  white 
  objects 
  amongst 
  the 
  brown 
  young 
  

   ones 
  which 
  might 
  be 
  remains 
  of 
  shells, 
  no 
  eggs 
  are 
  visible 
  outside 
  her. 
  I 
  

   am 
  unable 
  to 
  account 
  for 
  the 
  blood-red 
  colour 
  of 
  the 
  cavity. 
  Signoret 
  

   speaks 
  of 
  it 
  as 
  "a 
  mortified 
  spot;" 
  but 
  it 
  sometimes 
  occupies 
  nearly 
  half 
  

   the 
  under 
  surface 
  of 
  the 
  body, 
  and 
  at 
  the 
  same 
  time 
  the 
  insect 
  is 
  not 
  dead. 
  

   The 
  interior 
  substance, 
  which, 
  in 
  mounting 
  for 
  the 
  microscope, 
  is 
  pressed 
  

   out 
  of 
  the 
  body, 
  is 
  not 
  red 
  but 
  yellowish 
  brown. 
  

  

  This 
  insect 
  is 
  becoming 
  a 
  veritable 
  pest 
  in 
  this 
  country. 
  Hollies, 
  ivies, 
  

   Portugal 
  laurels, 
  and 
  many 
  other 
  trees 
  in 
  our 
  gardens 
  are 
  every 
  year 
  

   becoming 
  more 
  and 
  more 
  infested 
  with 
  it. 
  Whatever 
  may 
  be 
  the 
  chances 
  

   of 
  keeping 
  it 
  down 
  in 
  greenhouses, 
  it 
  is 
  to 
  be 
  feared 
  that 
  a 
  cure 
  for 
  plants 
  

   out 
  of 
  doors 
  is 
  next 
  to 
  impossible. 
  

  

  2. 
  Lecanium 
  depressuyii, 
  Targioni. 
  

  

  This 
  is 
  an 
  European 
  species, 
  occurring 
  here 
  in 
  our 
  greenhouses. 
  The 
  

   adult 
  female 
  is 
  oval, 
  not 
  so 
  flat 
  as 
  Lecanium 
  hesjyeridum, 
  and 
  with 
  the 
  skin 
  

   curiously 
  marked 
  with 
  a 
  mosaic 
  pattern. 
  

  

  