286 
A.nnual  Report  for  1904  of  the  Zoologist. 
but  the  spots  from  which  the  balloon-like  sensory  hairs  arise  (clave  stimmatirhe 
of  Canestrini)  are  yellow,  and  there  are  two  short  stout  bristles  above  the 
posterior  end  of  the  body,  directed  backwards.  Male  : yellow  and  sub- 
triangular,  being  broadest  about  the  level  of  the  third  pair  of  legs.  The 
posterior  ]iart  of  the  body  is,  however,  produced  into  an  elevated  process, 
abruptly  truncated  and  furnished  with  a pair  of  stout  hooks  at  the  corners. 
Two  strong  bristles  proceed  from  the  sides  of  the  caudal  process.  The  body 
is  also  furnished  with  several  strong  and  conspicuous  bristles  (see  Fig.  4). 
The  epimera  of  the  third  and  fourth  legs  almost  reach  the  transverse  line. 
The  second  free  joint  of  the  fourth  leg  is  highly  characteristic,  being  furnished 
on  its  inner  side,  for  three-fourths  of  its  length,  with  a chitinous  expansion 
which  terminates  in  a prominent  blunt  process. 
In  November  specimens  of  a newly  introduced  greenhouse 
plant,  Chironia  exigera,  were  sent  for  examination,  as  they 
were  evidently  suffering  from  the  attack  of  some  pest.  The 
fleshy  leaves  were  twisted  and  distorted,  and  the  nodes  from 
which  the  whorls  of  leaves  proceeded  had  a brown  and  decayed 
appearance.  In  the  neighbourhood  of  these  nodes  were  found 
numerous  female  Tarsonemus  mites  and  a large  number  of 
eggs.  Very  few  males  were  found,  the  season  being  probably 
too  far  advanced.  This  creature  seemed  distinct  from  the 
foregoing,  and  I describe  it  under  the  name  of — 
Tarsonemus  cliironke,  n.  sp. 
Female  : long-oval,  bluntly  pointed  behind,  and  deep  yellow  in  coloui'. 
About  '24  mm.  in  length.  The  spots  from  which  the  sensory  hairs  arise  are 
iiot  pigmented.  Male  : yellow  and  sub-triangular.  The  caudal  proce.ss  is  not 
conspicuous  and  is  rounded,  being  tlcvoid  of  the  hooks  and  lateral  bri.stles. 
The  bristles  on  the  body  are  hartlly  noticeable.  There  is  a considerable 
interval  between  the  transverse  line  and  the  terminations  of  the  epimera 
of  the  third  and  fourth  leg.  The  second  free  joint  of  the  fourth  leg  has  a 
prominence  terminating  in  a short  bristle  on  the  inner  side  near  its  origin, 
but  continues  thereafter  of  nearly  uniform  thickness  to  its  termination. 
In  searching  for  analogous  cases  of  disease  in  other  plants, 
I came  across  some  notices  of  a “begonia  mite”  in  horticultural 
publications,  and  was  anxious  to  see  if  it  belonged  to  either  of 
the  species  above  described.  I obtained  several  specimens 
of  begonia  leaves  said  to  be  diseased,  but  could  And  no  mite 
upon  them,  though  a few  eggs  were  present.  The  attack  was 
apparently  over  for  the  year.  I gather  that  it  is  a Tarsonemus, 
but  it  does  not  appear  to  have  been  deflnitely  identified  or 
described,  and  its  more  accurate  investigation  must  be  deferred 
for  a few  months. 
As  far  as  I have  been  able  to  ascertain,  seven  species  of 
Tarsonemus  have  been  described  hitherto,  and  it  may  be 
useful  to  enumerate  them  here. 
1.  T.  Jtoriculus  Canestrini  and  Fanzago,  Atti  del.  Soc.  Venetu-Trenthui  di 
Sci.  Xat.,  Vol.  5,  1876,  said  to  have  been  found  on  the  leaves  of  a large  variety  of 
plants.  It  may  be  doubted,  hovt'ever,  whether  other  species  have  not  sometimes 
been  included  under  this  name. 
2.  T.  lurchneri  Kramer,  Arehir.f.  Xat.  .JaUnj.,  42,  page  199,  under  the 
genus  l)eiulro}>tus.  This  mite  was  found  inside  the  galls  of  an  Erloplujes. 
