﻿774 
  REPORT 
  OF 
  NEW 
  JERSEY 
  STATE 
  MUSEUM. 
  

  

  CESTRUS 
  Linn. 
  

  

  O. 
  ovis 
  Linn. 
  The 
  sheep-bot. 
  

   This 
  species 
  lives 
  in 
  the 
  

   nasal 
  and 
  other 
  head 
  pass- 
  

   ages 
  of 
  sheep 
  and 
  causes 
  a 
  

   disease 
  known 
  as 
  staggers, 
  

   often 
  resulting 
  in 
  death. 
  

  

  CUTEREBRA 
  Clark. 
  

  

  VI 
  

   A 
  

  

  the 
  

  

  C. 
  buccata 
  Fab. 
  Ocean 
  Co 
  

   (Sm) 
  ; 
  Dunnfield 
  VII, 
  12 
  

   species 
  living 
  under 
  

   skin 
  of 
  rabbits. 
  

  

  C. 
  horripilum 
  Clark. 
  Riverton 
  

   VII, 
  6. 
  

  

  Fig. 
  321. 
  — 
  The 
  sheep-bot, 
  CEstrus 
  ovis: 
  i, 
  

   flies, 
  wings 
  closed 
  and 
  open; 
  3, 
  pupa; 
  

   4, 
  5, 
  full 
  grown 
  larvae; 
  6, 
  

   young 
  larva. 
  

  

  Family 
  TACHINID^. 
  

  

  The 
  Tachina 
  flies 
  are 
  almost 
  all 
  parasitic 
  and 
  of 
  the 
  very 
  highest 
  use- 
  

   fulness, 
  since 
  they 
  form 
  the 
  chief 
  control 
  of 
  many 
  caterpillars. 
  They 
  

   resemble 
  house-flies, 
  flesh-flies, 
  and 
  blue-bottles 
  in 
  appearance, 
  but 
  are 
  

   much 
  more 
  bristly; 
  sometimes 
  formidable-looking 
  from 
  the 
  array 
  of 
  

   sharp 
  points 
  projecting 
  in 
  every 
  direction. 
  

   The 
  bristle 
  on 
  the 
  third 
  antennal 
  joint 
  is 
  

   always 
  bare, 
  and 
  this 
  is 
  the 
  best 
  char- 
  

   acter 
  for 
  the 
  recognition 
  of 
  the 
  family. 
  

  

  These 
  flies 
  often 
  lay 
  their 
  eggs 
  on 
  the 
  

   outside 
  of 
  the 
  caterpillar, 
  usually 
  just 
  back 
  

   of 
  the 
  head, 
  where 
  the 
  larvae 
  cannot 
  easily 
  

   get 
  at 
  them. 
  They 
  are 
  white 
  in 
  color 
  and 
  

   quite 
  large 
  enough 
  to 
  be 
  easily 
  seen. 
  

  

  Cut-worms 
  are 
  a 
  common 
  prey 
  of 
  these 
  

   flies; 
  sometimes 
  of 
  hundreds 
  of 
  such 
  larva) 
  

   gathered 
  not 
  two 
  per 
  cent, 
  will 
  be 
  free 
  of 
  

   these 
  white 
  eggs. 
  In 
  an 
  army 
  worm 
  year 
  

   sometimes 
  scarcely 
  one 
  per 
  cent, 
  of 
  the 
  last 
  

   brood 
  is 
  free. 
  Anywhere 
  from 
  one 
  to 
  100 
  

   grubs 
  may 
  infest 
  a 
  single 
  caterpillar, 
  depending 
  upon 
  the 
  size 
  of 
  the 
  

   host. 
  

  

  GYMNOCLYTIA 
  B. 
  & 
  B. 
  (CISTOGASTER.) 
  

   G. 
  immaculata 
  Macq. 
  Westville 
  VI, 
  26 
  (Jn) 
  ; 
  Glassboro 
  VII, 
  8 
  (CG); 
  

  

  Clementon 
  V, 
  30, 
  IX, 
  5 
  (Hk). 
  

   G. 
  occidua 
  Walk. 
  Dover 
  VI, 
  17, 
  Chester 
  VII, 
  25, 
  Westville, 
  Atco 
  VII, 
  12 
  

   (Jn); 
  Middlesex 
  Co. 
  VII, 
  7, 
  Jamesburg 
  VII, 
  4 
  (Sm). 
  

  

  Fig. 
  422. 
  — 
  Tachinid 
  parasite 
  on 
  

   cut-worms 
  showing 
  larva, 
  

   pi;pa 
  and 
  adult, 
  as 
  well 
  as 
  

   the 
  eggs 
  on 
  the 
  anterior 
  

   segments 
  of 
  a 
  caterpillar. 
  

  

  GYMNOSOMA 
  Meig. 
  

   G. 
  fuliginosa 
  Desv. 
  Caldwell 
  (Cr); 
  Woodbury 
  VI, 
  7, 
  Clementon 
  VIII, 
  

   Buena 
  Vista 
  VI, 
  11, 
  Anglesea 
  VII, 
  19 
  (Jn). 
  

  

  