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Cape  Colony  and  that  in  the  same  year  he  obtained  a Diaspis 
pentagona  which  lived  on  trees  in  the  Department  of  Agriculture 
.grounds  in  Washington;  that  in  1896  he  identified  as  Aspidioli- 
phagns  citrinis  specimens  of  parasites  obtained  by  Cockerell  from 
Diaspis  pentagona  from  Ceylon  and  of  Cape  Colony;  that  in  1897 
he  obtained  a species  of  parasite  of  the  same  scalebug  received 
from  Wooster,  Ohio,  and  in  1898  other  specimens  (from  the  same 
locality)  which  he  recognized  this  time  as  Archenomus  bicolor, 
How.  In  1898  he  obtained  another  species  of  parasite  from  speci- 
mens of  Diaspis  pentagona  received  from  Fritz  Noack  of  Cam- 
pinas (Brazil),  and  in  1899  he  obtained  also  three  species  of  para- 
sites of  the  same  scale  gathered  in  Porto  Rico  by  Mr.  August 
Busck. 
I am  now  getting  material  from  all  the  regions  where  parasites 
of  Diaspis  pentagona  have  been  found,  but  I believe  it  would  be 
also  well  to  send  an  entomologist  specially  to  China  and  Japan 
to  study  there  all  the  natural  enemies  of  Diaspis  to  make  a rich 
collection  and  repeated  shipments  until  their  acclimatization  shall 
have  been  assured.  Such  a trip  to  China  would  be  also  opportune 
for  studying  the  parasites  of  Aonidiella  aurantii , Lepidosaphes 
eitricola  and  Parlatoria  zizyphi,  which  are  scalebugs  very  harmful 
to  citrus  trees  and  which  have  no  parasite  in  our  country,  while 
it  is  known  for  certain  through  the  researches  of  Compere  and 
Muir  that  they  have  such  in  that  country. 
To  fight  Diaspis  the  introduction  of  all  kinds  of  endophagous 
and  predatory  parasites  and  also  of  other  Diaspinae  from  any  coun- 
try should  be  tried.  Only  in  the  natural  fight  is  there  likely  to 
be  found  a certain  and  really  useful  method  of  fighting  this  scale 
which  threatens  one  of  our  most  flourishing  industries. 
Government  and  private  citizens  should  vie  with  each  other  to 
follow  the  way  to  a possible  natural  fight  and  lose  every  hope 
only  afte  reverything  that  modern  entomology  can  do  has  been 
fried. 
APHIDAE. 
Koebele  on  the  first  trip  to  New  Zealand  and  Australia  collected 
in  the  first  named  region  about  fifty  specimens  of  Coccinella  nova 
zealandica  predatory  on  Aphis  brassicae  and  took  them  to  Cali- 
fornia, succeeding  in  liberating  twenty-one  near  Alameda.  On 
his  second  trip  he  sent  the  following  species  to  California : Coc- 
cinella arcuata,  Fabr.,  (for  the  Aphids  of  Citrus  trees),  Leis  con- 
f or  mis,  Bold.,  for  various  Aphids  and  specially  for  Schizoneura 
lanigera , Coccinella  Kingi,  MacLeay,  for  aphids  of  citrus  trees; 
■Coelophora  inaequatis,  F.,  ( =Coc . re  panda,  Koebele)  for  various 
aphids ; Me  da  testurinaris,  Muls.,  for  aphids  of  citrus  trees ; 
Verania  frenata,  for  various  aphids;  Scymnus  notescens,  Blackb., 
for  the  aphids  of  citrus  trees.  But  of  these  species  not  one  seems 
