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Koebele  went  in  1906  to  the  United  States  and  sent  from  Ari- 
zona to  Hawaii  two  hymenopterous  parasites  of  Lyperosia,  name- 
ly,. Ea  coil  a impatiens  Say,  Eutrias  sp.  and  several  Coleoptera 
living  in  dung  and  considered  predatory  on  the  larvae  of  this  in- 
sect: Histend  sp.,  Copris  Carolina  L.  and  six  other  species.  Of 
these  parasites  one  species  of  Histeridae  and  Eucoila  have  become 
acclimated,  but  up  to  the  present  they  have  multiplied  little  and  as 
it  appeared  that  they  could  be  little  relied  upon,  Koebele  was  sent 
■to  Europe  in  1908,  where  he  still  is,  in  search  of  parasites  of  this 
fly  known  in  America  and  Hawaii  under  the  name  of  “Horn  fly” 
( Haematobia  serrata  Desv.). 
ACARIDAE.  (TETRANYCHUS  TELARIUS  L.). 
This  mite,  probably  of  European  origin,  is  now  spread  almost 
over  the  whole  earth.  It  lives  on  leaves  of  numerous  plants,  in- 
cluding citrus,  on  which  it  had  specially  spread  in  California,  fav- 
ored by  a dry  climate. 
George  Compere  observed  in  Australia  a very  small  Coccinel- 
lid  (Scymnus  vagans)  breeding  on  this  mite,  collected  a consider- 
able number  of  specimens  and  took  them  to  California  where  they 
became  acclimated  excellently. 
The  same  species  of  Scymus  was  later  introduced  for  the  same 
purpose  in  the  Hawaiian  Islands  where  it  also  became  acclimated. 
IXODIDAE. 
In  1907  L.  O.  Howard  described  the  first  species  of  the  Hymen- 
opteron,  Encyrtid  ( Ixodiphagus  texanus  How.)  parasite  of  a tick, 
Haemaphysalis  leporispalnstris  Pack.  In  1908  the  same  author 
described  another  species  of  the  same  group,  Hnnterellus  Hookeri 
How.,  parasite  of  another  tick,  Rhipicephalus  texanus  Banks. 
In  consequence  of  the  discovers  of  this  Hvmenopterous  parasite 
in  the  United  States  its  biology  was  studied  to  see  whether  it 
would  be  possible  to  multiplv  and  use  it  to  fight  Margaropus  an- 
nullatus  (Say),  the  tick  which  transmits  the  Texas  fever.  Hunter, 
who  is  at  the  head  of  the  laboratory  at  Dallas,  where  the  tick  is 
studied,  sent  in  1907  specimens  of  parasitised  ticks  to  Lounsbury 
in  South  Africa  and  others  to  the  laboratory  of  Portici,  where 
thev  are  at  present  under  observation  in  tubes. 
In  the  spring  when  parasites  will  issue,  it  will  be  my  duty  to 
get  Italian  ticks,  especiallv  Margaropus,  infested  by  them  : for  in 
our  country,  also  in  the  Roman  campagna  and  elsewhere,  the  tick 
transmits  Piroplasma,  which  causes  bovine  malaria. 
If  this  experiment  proves  successful  it  will  certainly  be  of  great 
advantage  to  the  cattle  industry. 
