search  was  made  for  them.  Both  the  nymphs  and  the  females  mature 
very  slowly ;  and  it  is  evident  that  all  three  stages  (larva,  nymph  and 
adult)  are  passed  upon  one  host;  so  that  in  this  respect  it  differs 
markedly  from  its  congeneric  representative,  Ambly omnia  cajanense, 
which  requires  three  hosts  and  effects  its  two  moults  upon  the  ground. 
The  life-cycle  of  A.  dissimile,  therefore,  resembles  that  of  the 
common  cattle  tick  {Mar  gar  opus  annul  atus  australis).  Two 
apparently  freshly  attached  larvae  filled  themselves  to  repletion  in 
about  one  week ;  but  the  nymphal  stage  occupied  from  four  to  seven 
weeks ;  and  three  females  were  fourteen,  seventeen  and  twenty-three 
days  respectively  in  maturing.  When  fully  engorged  they  left  the 
host  and  in  all  cases  buried  themselves  among  the  loose  damp  grass 
forming  the  bed  at  the  bottom  of  the  cage  in  which  the  toads 
were  kept.  Egg  laying,  commencing  on  the  seventh  day,  and  was 
continued  for  seventeen  days.  The  number  of  eggs  laid  by  one 
female  was  1,784.  These  unfortunately  did  not  hatch  before  the 
members  of  the  expedition  left  the  Island ;  but  they  survived  the 
low  temperature  of  the  voyage  to  England,  and,  although  they  were 
not  placed  in  the  incubator  until  some  time  after  arrival,  several 
larvae  hatched  out  in  a  temperature  of  23°  C.  during  the  second  week 
in  May;  so  that  it  is  evident  that  the  eggs  of  this  species  are 
exceedingly  resistent  to  cold.  The  replete  female  feigns  death  when 
disturbed,  but  crawls  about,  when  left  undisturbed,  in  a  fairly  active 
manner. 
Host.  Apparently  confined  to  the  common  toad  or  so-called  ‘  Bull¬ 
frog’  of  the  Island  {Bufo  marinus,  Gravenh.).  This  tick  often 
occurred  singly ;  but  occasionally  four  or  five  examples,  in  various 
stages  of  development,  were  found  upon  a  single  host.  It  has  not 
hitherto  been  recorded  from  Jamaica. 
Distribution.  Sparingly  in  the  Montpellier  district  in  the  parishes 
of  St.  James  and  Hanover;  Vere  District,  Clarendon;  and  at  Mona, 
Bertaville,  and  Constant  Spring  in  the  parish  of  St.  Andrew.  It  may 
also  occur  in  all  districts  where  the  host  is  found. 
D istribution  outside  the  Island  of  J amaica.  Neumann  gives 
Mexico,  Guatemala,  Nicaragua,  Barbados,  Columbia,  Venezuela, 
Brazil,  Paraguay  and  the  Philippines ;  and  Bufo  marinus  as  the  only 
host. 
