﻿NATURAL 
  ENEMIES 
  OF 
  THE 
  LOCUST. 
  269 
  

  

  the 
  legs 
  arc 
  all 
  shorter; 
  the 
  prothoracie 
  spiracles 
  less 
  conspicuous; 
  the 
  hairs 
  on 
  ab- 
  

   dominal 
  joints 
  shorter; 
  the 
  transverse 
  dorsal 
  teeth 
  smaller 
  and 
  in 
  single 
  row; 
  the 
  

   basal 
  abdominal 
  joint 
  without 
  spines, 
  but 
  with 
  long 
  stout 
  hairs 
  and 
  the 
  dorsal 
  tuber- 
  

   cles 
  of 
  abdominal 
  joint 
  9 
  replaced 
  by 
  a 
  single 
  spine. 
  

  

  Imago 
  (PL 
  XVI, 
  Figs. 
  0, 
  7). 
  — 
  The 
  generic 
  characters 
  as 
  indicated 
  in 
  our 
  figures, 
  and 
  

   especially 
  the 
  larger 
  head 
  and 
  eyes, 
  more 
  slender 
  form, 
  and 
  short 
  proboscis 
  readily 
  

   distinguish 
  this 
  from 
  the 
  Syshcehu*. 
  The 
  sexes 
  are 
  also 
  readily 
  separated 
  by 
  the 
  more 
  

   pronounced 
  transverse 
  rows 
  of 
  white 
  or 
  tawny 
  hairs 
  on 
  the 
  hind 
  borders 
  of 
  the 
  abdom- 
  

   inal 
  joints 
  in 
  the 
  female. 
  The 
  genus 
  in 
  some 
  degree 
  connects 
  the 
  Anthracini 
  with 
  

   the 
  more 
  typical 
  Bombyliini. 
  In 
  certain 
  lights 
  the 
  tegument 
  reveals 
  a 
  greenish 
  tinge, 
  

   and 
  the 
  pubescenee 
  of 
  the 
  thorax 
  appears 
  generally 
  of 
  a 
  tawny 
  color. 
  The 
  male 
  some- 
  

   times 
  has 
  a 
  white 
  tomentum 
  on 
  the 
  front, 
  and 
  in 
  some 
  specimens 
  there 
  is 
  a 
  stump 
  of 
  

   a 
  vein 
  extending 
  into 
  the 
  discal 
  cell. 
  We 
  quote 
  the 
  original 
  description: 
  

  

  Triodites 
  mus, 
  $ 
  9- 
  — 
  Uniformly 
  clothed 
  with 
  whitish-gray 
  pile 
  ; 
  face 
  with 
  white 
  

   pile 
  : 
  wing 
  hyaline. 
  Length 
  8-9 
  mm 
  . 
  

  

  Male. 
  — 
  Frontal 
  triangle 
  black, 
  with 
  short, 
  erect, 
  black 
  pile 
  ; 
  face 
  with 
  a 
  dense 
  

   covering 
  of 
  short 
  snow-white 
  pile 
  ; 
  antennas 
  black 
  ; 
  occiput 
  black, 
  with 
  appressed 
  

   white 
  hairs 
  along 
  the 
  orbits; 
  thorax 
  grayish-black, 
  with 
  a 
  dense 
  covering 
  of 
  delicate, 
  

   downy, 
  whitish-gray 
  pile, 
  which 
  in 
  an 
  oblique 
  light 
  looks 
  altogether 
  white 
  ; 
  the 
  few- 
  

   bristles 
  on 
  the 
  antescutellar 
  callosities 
  and 
  on 
  the 
  scutellum 
  are 
  whitish, 
  almost 
  

   colorless 
  : 
  abdomen 
  black, 
  with 
  the 
  same 
  covering 
  of 
  grayish-white 
  pile, 
  which 
  is 
  

   longer 
  here 
  on 
  the 
  sides. 
  Halteres 
  whitish 
  ; 
  knob 
  brownish. 
  Legs 
  black, 
  densely 
  

   clothed 
  with 
  white 
  scales 
  ; 
  spines 
  on 
  femora 
  and 
  tibiae 
  whitish-yellow. 
  "Wings, 
  in- 
  

   cluding 
  the 
  costal 
  cell, 
  of 
  a 
  pure 
  hyaline; 
  veins, 
  except 
  at 
  the 
  root, 
  black 
  ; 
  costal 
  and 
  

   first 
  longitudinal 
  brown. 
  

  

  Female. 
  — 
  Like 
  the 
  male, 
  but 
  the 
  front 
  is 
  slightly 
  brownish-pruinose, 
  and 
  has, 
  besides 
  

   the 
  erect, 
  black 
  pile, 
  some 
  short, 
  recumbent, 
  yellowish 
  hairs. 
  The 
  hind 
  margin 
  of 
  

   the 
  abdominal 
  segments 
  are 
  beset 
  with 
  some 
  short, 
  appressed, 
  whitish 
  hairs, 
  forming 
  

   cross-bands. 
  

  

  Hab. 
  — 
  I 
  have 
  a 
  single 
  male, 
  which 
  I 
  took 
  near 
  the 
  Salt 
  Lake, 
  Utah, 
  August 
  1. 
  One 
  

   of 
  the 
  females 
  is 
  from 
  Sonoma 
  County, 
  California, 
  July 
  6 
  ; 
  the 
  other 
  from 
  the 
  Shasta 
  

   district 
  (H. 
  Edwards. 
  July, 
  1875). 
  

  

  As 
  the 
  larvae 
  from 
  the 
  Mississippi 
  Valley, 
  so 
  far 
  as 
  ascertained, 
  belong 
  

   to 
  Systcechus, 
  and 
  as 
  the 
  Triodites 
  is 
  not 
  yet 
  known 
  to 
  occur 
  east 
  of 
  Utah, 
  

   we 
  conclude 
  that 
  the 
  former 
  genus 
  is 
  the 
  one 
  most 
  affecting 
  the 
  locusts 
  

   in 
  the 
  Mississippi 
  Valley. 
  337 
  

  

  337 
  Since 
  the 
  above 
  was 
  written 
  and 
  in 
  type 
  we 
  have 
  met 
  with 
  an 
  article, 
  previously 
  

   overlooked, 
  "On 
  the 
  Economy, 
  &c, 
  of 
  Bombylius. 
  '" 
  by 
  T. 
  Algernon 
  Chapman, 
  M. 
  D., 
  

   in 
  the 
  Entomologist's 
  Monthly 
  Magazine 
  for 
  February, 
  1878, 
  vol. 
  14, 
  p. 
  196. 
  Mr. 
  Chap- 
  

   man 
  gives 
  abundant 
  proof 
  of 
  the 
  parasitism 
  of 
  the 
  European 
  B. 
  major 
  on 
  Andrena 
  labialis. 
  

   He 
  records 
  some 
  observations 
  on 
  the 
  ovipositionof 
  Bombylius, 
  the 
  small 
  white 
  egg 
  being 
  

   thrown 
  with 
  a 
  short 
  jerk 
  against 
  the 
  earth 
  near 
  where 
  the 
  food 
  of 
  its 
  future 
  larva 
  presum- 
  

   ably 
  occurred. 
  This 
  would 
  also 
  imply 
  that, 
  as 
  in 
  the 
  case 
  of 
  the 
  Blister-beetles, 
  the 
  

   newly-hatched 
  larva 
  must 
  seek 
  its 
  food, 
  and 
  strengthens 
  our 
  suspicion 
  that 
  it 
  will 
  be 
  

   found 
  to 
  be 
  much 
  more 
  active 
  than 
  the 
  mature 
  larva. 
  Mr. 
  Chapman 
  very 
  fully 
  de- 
  

   scribes 
  the 
  mature 
  larva 
  and 
  the 
  pupa, 
  and 
  his 
  descriptions 
  show 
  that 
  in 
  all 
  essential 
  

   points 
  the 
  larva 
  of 
  Bombylius 
  accords 
  with 
  those 
  of 
  Triodites 
  and 
  Systoechus. 
  We 
  quote 
  

   his 
  description 
  of 
  the 
  head 
  : 
  "The 
  head 
  is 
  set 
  into 
  this 
  segment 
  [the 
  1st 
  thoracic] 
  and 
  

   is 
  retractile. 
  It 
  is 
  very 
  small; 
  its 
  center 
  is 
  occupied 
  by 
  a 
  prominent 
  wedge-shaped 
  

   portion, 
  the 
  point 
  of 
  the 
  wedge 
  being 
  downwards 
  and 
  immediately 
  in 
  front^>f 
  the 
  

   mouth. 
  Immediately 
  behind 
  this 
  are 
  two 
  black, 
  very 
  sharp, 
  setiform 
  jaws(?) 
  ; 
  on 
  

   each 
  side 
  is 
  a 
  papillary 
  eminence 
  (antenna?) 
  of 
  three 
  joints 
  set 
  in 
  a 
  circle 
  of 
  softer 
  

   tegument, 
  and 
  immediately 
  below 
  project 
  downward 
  on 
  each 
  side 
  two 
  large 
  palpi 
  

   (labrnm?), 
  looking 
  like 
  jaws, 
  but 
  having 
  a 
  vertical, 
  not 
  a 
  lateral, 
  mobility. 
  On 
  the 
  

   anterior 
  surface 
  of 
  each 
  of 
  these 
  there 
  is 
  a 
  palpus 
  of 
  some 
  length, 
  apparently 
  unjointed, 
  

   set 
  in 
  a 
  circle. 
  " 
  It 
  will 
  thus 
  be 
  seen 
  that 
  he 
  homologizes 
  the 
  parts 
  much 
  as 
  we 
  have 
  

   done, 
  except 
  that 
  he 
  refers 
  the 
  two 
  lower 
  palpigerous 
  pieces, 
  with 
  a 
  question, 
  to 
  the 
  

   24 
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