431 
figures  (i  and  2),  but  these  can  be  seen  only  by  the  aid  of  a  micro¬ 
scope.  The  various  phases  in  the  development  of  the  Texas  fever 
tick  and  the  silver  tick  are  illustrated  on  the  accompanying  Plate  XlII, 
figs.  I,  2. 
Fig  I.  .Silver  Tick  [Amblyomma  caj'anense).  Unfed  female. 
Enlarged  ten  diameters,  about. 
Fig.  2.  Mouth  parts  (capitulum)  of  Silver  Tick  {Amblyomma 
cajanense).  Ventral  aspect.  Greatly  enlarged. 
ARTIFICIAL  KEY  TO  THE  JAMAICA  TICKS 
The  subjoined  key  to  the  ticks  found  in  Jamaica  is  decidedly 
artificial  in  its  arrangement.  It  has  been  devised  as  a  ready  means 
of  assisting  in  the  identification  of  ticks  without  recourse  to  a  micro- 
