﻿SEPT. 
  19, 
  1922 
  baker: 
  new 
  aphids 
  from 
  baIvTic 
  amber 
  357 
  

  

  he 
  mentioned 
  these 
  structures 
  and 
  described 
  the 
  insect 
  as 
  immature. 
  

   It 
  is, 
  however, 
  an 
  alate 
  specimen 
  which 
  has 
  lost 
  the 
  wings, 
  or 
  possibly 
  

   an 
  intermediate, 
  for 
  the 
  structure 
  of 
  the 
  thorax 
  is 
  well 
  preserved 
  and 
  

   the 
  ocelli 
  are 
  visible. 
  The 
  cornicles, 
  if 
  they 
  are 
  cornicles, 
  are 
  broad 
  

   at 
  the 
  base, 
  short 
  and 
  somewhat 
  tapering. 
  The 
  cauda 
  seems 
  to 
  be 
  

   knobbed 
  and 
  the 
  anal 
  plate 
  bilobed. 
  The 
  entire 
  insect 
  suggests 
  the 
  

   genus 
  Euceraphis. 
  

  

  A 
  detailed 
  reference 
  to 
  the 
  other 
  specimens 
  in 
  the 
  collection 
  could 
  

   add 
  little 
  to 
  the 
  knowledge 
  already 
  available, 
  but 
  I 
  believe 
  that 
  the 
  

   remarks 
  here 
  given, 
  together 
  with 
  the 
  detailed 
  description 
  of 
  the 
  

   amber 
  species, 
  are 
  sufficient 
  to 
  support 
  the 
  view 
  that 
  Mindarus 
  is 
  

   a 
  genus 
  formerly 
  dominant 
  but 
  now 
  represented 
  by 
  the 
  solitary, 
  cos- 
  

   mopolitan, 
  conifer-feeding 
  species 
  abietinus. 
  

  

  The 
  descriptions 
  of 
  the 
  amber 
  species 
  given 
  herein 
  are 
  the 
  first 
  in 
  

   which 
  any 
  attempt 
  has 
  been 
  made 
  to 
  give 
  the 
  more 
  minute 
  details 
  

   of 
  structure 
  as 
  is 
  done 
  in 
  the 
  description 
  of 
  living 
  forms. 
  This 
  has 
  

   been 
  possible 
  by 
  use 
  of 
  the 
  same 
  high 
  magnification 
  adopted 
  in 
  study- 
  

   ing 
  recent 
  aphids 
  and 
  the 
  employment 
  of 
  powerful 
  illumination. 
  Even 
  

   with 
  the 
  best 
  Hght 
  available, 
  however, 
  certain 
  desirable 
  characters 
  

   remain 
  obscured. 
  

  

  Mindarus 
  magnus 
  Baker, 
  n. 
  sp. 
  

  

  Alate 
  viviparous 
  female. 
  — 
  Head, 
  thorax, 
  and 
  appendages 
  appearing 
  as 
  

   dark 
  brown. 
  Abdomen 
  yellowish, 
  possibly 
  greenish 
  in 
  life, 
  with 
  a 
  large 
  

   dark 
  central 
  dorsal 
  marking 
  irregular 
  in 
  outline. 
  Wings 
  transparent, 
  the 
  

   veins 
  and 
  stigma 
  brown. 
  

  

  Length 
  from 
  vertex 
  to 
  tip 
  of 
  cauda 
  2 
  mm., 
  width 
  of 
  head 
  across 
  the 
  eyes 
  

   0.48 
  mm. 
  Fore 
  wing 
  (Fig. 
  1) 
  2.88 
  mm. 
  X 
  1.2 
  mm. 
  at 
  its 
  greatest 
  diameter. 
  

   Hind 
  wing 
  1.28 
  X 
  0.56 
  mm. 
  Antenna 
  (fig. 
  3) 
  extending 
  about 
  to 
  the 
  wind 
  

   insertions, 
  segment 
  III 
  0.24 
  mm. 
  with 
  9 
  or 
  10 
  transverse 
  sensoria, 
  IV 
  0.08 
  

   mm., 
  V 
  0.096 
  mm., 
  VI 
  (0.112 
  -|- 
  0.048 
  mm.), 
  these 
  segments 
  distinctly 
  im- 
  

   bricated 
  and 
  bearing 
  the 
  usual 
  fringed 
  sensoria. 
  The 
  measurements 
  given 
  

   for 
  the 
  antennal 
  segments 
  cannot 
  be 
  considered 
  absolutely 
  exact 
  in 
  view 
  of 
  

   the 
  fact 
  that 
  they 
  are 
  not 
  perfectly 
  horizontal 
  in 
  the 
  amber. 
  In 
  the 
  second 
  

   specimen, 
  segment 
  III 
  of 
  one 
  antenna 
  is 
  0.304 
  mm. 
  long 
  and 
  segment 
  IV 
  

   appears 
  to 
  have 
  2 
  or 
  3 
  sensoria. 
  Cauda 
  and 
  anal 
  plate 
  not 
  distinctly 
  \isible 
  

   but 
  apparently 
  as 
  in 
  Fig. 
  6, 
  cauda 
  possibly 
  more 
  extended 
  in 
  life. 
  Cor- 
  

   nicles 
  obscured. 
  Beak 
  long, 
  extending 
  to 
  about 
  the 
  middle 
  of 
  the 
  abdomen. 
  

  

  Nymph. 
  — 
  What 
  is 
  possibly 
  the 
  2nd 
  instar 
  of 
  this 
  species 
  is 
  herewith 
  de- 
  

   scribed. 
  

  

  Length 
  from 
  vertex 
  to 
  tip 
  of 
  cauda 
  0.896 
  mm. 
  Length 
  from 
  vertex 
  to 
  

   tip 
  of 
  beak 
  1.36 
  mm. 
  Antennal 
  segments 
  with 
  the 
  following 
  measurements: 
  

   I 
  0.032 
  mm., 
  II 
  0.048 
  mm.. 
  Ill 
  0.032 
  mm., 
  IV 
  0.032 
  mm., 
  V 
  0.048 
  mm., 
  IV 
  

   (0.048 
  -f 
  0-048 
  mm.). 
  Form 
  elongate, 
  rather 
  slender, 
  segmentation 
  distinct, 
  

   color 
  appearing 
  brownish. 
  

  

  Mindarus 
  magnus 
  differs 
  from 
  M. 
  abietinus 
  in 
  being 
  much 
  larger, 
  in 
  having 
  

   a 
  longer 
  beak 
  and 
  in 
  having 
  somewhat 
  stouter 
  and 
  relatively 
  shorter 
  antennae. 
  

  

  