﻿706 
  KEPORT 
  UKITED 
  STATES 
  GEOLOGICAL 
  SURVEY. 
  

  

  Two 
  parasites 
  live 
  in 
  this 
  \mcrog&steT,Sockeria])erpulc]ira 
  aod 
  Glyplie 
  

   viridescens, 
  belonging 
  to 
  the 
  Chalcid 
  family 
  of 
  ichneumons. 
  Walsh 
  says 
  :|j 
  

  

  We 
  now 
  know 
  that 
  of 
  145 
  ichneumon-flies, 
  promiscuously 
  taken, 
  that 
  had 
  depre- 
  , 
  

   dated 
  on 
  the 
  army-worm, 
  27, 
  or 
  only 
  18 
  per 
  cent., 
  perished 
  by 
  Chalcis 
  flies. 
  j 
  

  

  Iclmeumon 
  leucaniw 
  Fitch. 
  — 
  Dr. 
  Fitch 
  has 
  given 
  an 
  account 
  of 
  another 
  i; 
  

   ichneumon. 
  fj 
  

  

  This 
  parasite 
  resembles 
  a 
  small 
  wasp, 
  nearly 
  half 
  an 
  inch 
  lon^, 
  of 
  a 
  bright 
  rust-red 
  I 
  

   color, 
  its 
  wings 
  smoky, 
  its 
  breast 
  black, 
  and 
  also 
  the 
  middle 
  of 
  its 
  back, 
  where 
  is 
  a 
  

   small 
  bright 
  sulphur-yellow 
  spot, 
  which 
  is 
  the 
  scutel. 
  The 
  antenna} 
  have 
  a 
  milk- 
  

   white 
  band 
  on 
  their 
  middle, 
  below 
  which 
  band 
  they 
  are 
  rush-red, 
  and 
  above 
  it 
  black. 
  

   There 
  are 
  two 
  narrow 
  bands 
  also 
  on 
  the 
  back 
  of 
  the 
  abdomen, 
  placed 
  on 
  the 
  fourth 
  or 
  

   fifth 
  joint, 
  and 
  the 
  slender 
  peduncle 
  of 
  the 
  abdomen 
  is 
  also 
  black. 
  Mr. 
  Sanborn 
  has 
  

   raised 
  this 
  same 
  species, 
  as 
  also 
  another 
  ichneumon, 
  which 
  we 
  describe. 
  

  

  Ichneumon 
  species. 
  — 
  Ichneumons 
  of 
  this 
  genus 
  are 
  rather 
  slender- 
  

   bodied 
  ; 
  the 
  abdomen 
  long 
  oval. 
  Wings 
  not 
  much 
  longer 
  than 
  the 
  slen- 
  f 
  

   cler 
  antenupe, 
  which 
  in 
  turn 
  are 
  a 
  little 
  more 
  than 
  one-half 
  the 
  length 
  of 
  ' 
  

   the 
  whole 
  body. 
  The 
  legs 
  and 
  joints 
  of 
  the 
  feet 
  are 
  also 
  slender. 
  The 
  

   ovipositor 
  of 
  the 
  female 
  is 
  not 
  apparent 
  ; 
  her 
  eggs 
  are 
  pedunculated, 
  - 
  

   having 
  a 
  general 
  likeness 
  to 
  those 
  of 
  the 
  genus 
  Ophion. 
  

  

  The 
  species 
  before 
  us 
  is 
  black 
  and 
  yellow. 
  Head 
  : 
  face 
  square, 
  yellow 
  ; 
  a 
  dark 
  line 
  i 
  

   borders 
  the 
  base 
  of 
  the 
  antenna?, 
  which 
  are 
  rusty, 
  the 
  first 
  joint 
  yellow, 
  and 
  the 
  ends 
  , 
  

   dusky. 
  Head 
  behind 
  the 
  antenufe 
  black. 
  Thorax 
  black 
  ; 
  above 
  on 
  its 
  first 
  joint, 
  or 
  ' 
  

   prothorax, 
  a 
  yellow 
  transverse 
  elliptical. 
  On 
  the 
  second 
  joint 
  which 
  carries 
  the 
  fore 
  

   wings 
  are 
  two 
  yellow 
  stripes 
  forking 
  toward 
  the 
  head. 
  Scutellum 
  yellow 
  ; 
  another 
  

   transverse 
  elliptical 
  yellow 
  spot 
  behind. 
  Third 
  joint 
  of 
  thorax 
  yellow 
  above, 
  black 
  . 
  

   beneath. 
  Legs 
  : 
  first 
  and 
  second 
  pairs 
  yellow, 
  reddish 
  above 
  on 
  first 
  joint. 
  Third 
  pair 
  

   black 
  at 
  base; 
  second 
  joint 
  yellow; 
  third, 
  or 
  femur, 
  black 
  ; 
  fourth, 
  or 
  tibia, 
  black 
  at 
  - 
  

   tip. 
  Tarsi, 
  or 
  toes, 
  marked 
  with 
  black. 
  j 
  

  

  The 
  elbowed 
  abdomen 
  black 
  at 
  base, 
  the 
  elbow 
  yellow. 
  The 
  next 
  three 
  yellow 
  \ 
  

   joints 
  with 
  a 
  narrow 
  black 
  strip 
  on 
  the 
  front 
  edge, 
  the 
  hinder 
  edge 
  of 
  the 
  ring 
  tinged 
  

   with 
  reddish. 
  Last 
  three 
  rings 
  black. 
  

  

  Our 
  last 
  parasite 
  is 
  a 
  fly, 
  or 
  species 
  of 
  the 
  Taclmia 
  family, 
  that 
  Mr. 
  

   Shurtleff 
  and 
  Sanborn 
  have 
  both 
  raised 
  from 
  the 
  army- 
  worm, 
  and 
  I 
  find 
  

   it 
  to 
  be 
  identical 
  with 
  the 
  species 
  that 
  attacks 
  the 
  worm 
  in 
  the 
  West. 
  

  

  lExorista 
  leucmiicG 
  Kirkpatrick 
  {Senometopki 
  militaris 
  Walsh). 
  — 
  This 
  p 
  

   genus 
  resembles 
  in 
  form 
  our 
  common 
  house-fly. 
  The 
  thorax 
  is 
  usually 
  |, 
  

   striped 
  longitudinally, 
  and 
  the 
  whole 
  body 
  covered 
  with 
  large 
  hairs. 
  It 
  

   flies 
  low 
  in 
  sunny 
  spots 
  in 
  woods, 
  with 
  a 
  loud 
  buzzing 
  noise. 
  We 
  copy 
  . 
  

   Mr. 
  Walsh's 
  description, 
  and 
  select 
  some 
  interesting 
  information 
  he 
  gives 
  

   us 
  about 
  its 
  habits 
  : 
  

  

  Length, 
  .25 
  to 
  .40 
  inch; 
  the 
  females 
  not 
  exceeding 
  .30 
  inch. 
  Face 
  silvery, 
  with 
  lat- 
  * 
  

   eral 
  black 
  hairs 
  only 
  on 
  the 
  cheeks, 
  at 
  the 
  top 
  of 
  which 
  is 
  a 
  black 
  bristle. 
  Front 
  

   golden 
  olive, 
  with 
  a 
  black 
  central 
  stripe, 
  and 
  lateral 
  black 
  convergent 
  hairs. 
  Occiput 
  , 
  

   dusky. 
  Labium, 
  brown, 
  with 
  yellowish 
  hair. 
  Maxipalps, 
  rufous. 
  Eyes, 
  cinnamon- 
  , 
  

   brown, 
  covered 
  with 
  very 
  short 
  dense 
  whitish 
  hair. 
  Antenna}, 
  two 
  basal 
  joints, 
  black, 
  

   with 
  black 
  hairs 
  ; 
  third 
  joint 
  flattened, 
  dusky, 
  and 
  from 
  two 
  and 
  a 
  half 
  to 
  three 
  times 
  

   the 
  length 
  of 
  the 
  second 
  joint 
  ; 
  seta, 
  black. 
  The 
  entire 
  hinder 
  part 
  of 
  the 
  head 
  cov- 
  

   ered 
  with 
  dense 
  whitish 
  hair. 
  Thorax 
  glabrous, 
  bluish-gray 
  and 
  lighter 
  at 
  the 
  sides, 
  

   with 
  four 
  irregular 
  black 
  vittce, 
  and 
  black 
  hairs 
  and 
  bristles. 
  Scutel, 
  reddish-brown, 
  

   whitish 
  behind, 
  glabrous, 
  with 
  black 
  hairs 
  and 
  bristles. 
  Pectus, 
  black, 
  glabrous, 
  with 
  

   hairs 
  and 
  lateral 
  bristles 
  ; 
  legs, 
  black, 
  hairy 
  ; 
  thighs, 
  dark 
  cinereous 
  beneath 
  ; 
  j)nr- 
  

   villi, 
  cinereous. 
  Wings, 
  hyaline 
  ; 
  nervures, 
  brownish 
  ; 
  alula}, 
  opaque 
  greenish-white, 
  i 
  

   Abdomen, 
  first 
  joint 
  black 
  ; 
  second 
  and 
  third, 
  opalescent 
  in 
  the 
  middle, 
  with 
  black 
  and 
  

   gray, 
  and 
  at 
  the 
  sides 
  with 
  rufous 
  and 
  gray; 
  last 
  joint, 
  rufous, 
  slightly 
  opalescent 
  at 
  

   base 
  with 
  gray 
  ; 
  all 
  with 
  black 
  hairs 
  and 
  lateral 
  bristles. 
  

  

  Beneath, 
  the 
  first 
  joint 
  is 
  black 
  ; 
  the 
  others, 
  black 
  marginal 
  with 
  rufous, 
  all 
  with 
  

   black 
  hairs. 
  In 
  the 
  male, 
  the 
  space 
  between 
  the 
  eyes 
  at 
  the 
  occiput 
  is 
  one-seventh 
  of 
  

   the 
  transverse 
  diameter 
  of 
  the 
  head 
  ; 
  in 
  the 
  female, 
  it 
  is 
  one-fourth. 
  

  

  Some 
  pupa-cases 
  of 
  this 
  fly 
  before 
  me 
  are 
  a 
  little 
  more 
  than 
  a 
  quarter 
  

   inch 
  long; 
  cylindricj^l 
  ; 
  rounded 
  at 
  each 
  end. 
  The 
  last 
  segment, 
  barely 
  

  

  