79 
if  possible,  the  skeleton  should  be  studied  ;  especially  the  skull,  m  all 
its  details,  deserves  a  very  close  and  minute  examination. 
Happily  enough  we  at  present  need  not  to  err  in  the  labyrinth  of 
defective  descriptions  and  subjective  views  concerning  good  or  bad  spe- 
cies, as  our  Flores-specimen  differs  so  widely  from  all  the  known  Rats, 
that  there  can  be  no  doubt  whatever,  whether  it  belongs  to  a  hitherto 
undescribed  species.  Professor  Max  Weber  proposed  to  name  it  after 
its  discoverer: 
Mus  armandvillei. 
Measurements  of  the  type-specimen,  an  adult  male,  preserved  in 
spirits  : 
Mm, 
Length  of  head  and  body   420 
Nose  to  eye   42 
Eye  to  ear   28 
Ear  34  X  26 
Length  of  tail  ,   350 
„     „  fore  foot  with  claw   47 
„      „  hind  foot   86 
„      „  skull   66 
„      „  nasals   24 
„     „  anterior  palatine  foramina   10 
„     „  molar  series   15 
Distance  between  upper  incisor  and  first  molar   17 
What  is  the  length  of  the  fore-arm  in  the  Chiroptera,  is  the  length 
of  the  hind  foot  in  the  Mures ,  namely  a  rather  constant  measurement 
for  all  the  fullgrown  individuals  of  a  given  species.  And  if  we  now 
look  over  the  other  large  yellow-tailed  rats  than  we  find,  that  Uromys 
macropus  has  every  way  the  strongest  and  most  developed  hindfeet, 
so  that  I  will  take  this  species  to  compare  our  Flores-species  with: 
moreover  Uromys  macropus  has  the  precedence  above  nearly  all  other 
allied  species,  as  it  has  been  very  correctly  described  and  figured  in 
details  by  Professor  Peters  (see  Monatsberichte  d.  k.  preuss.  Akad.  d.  Wis- 
sensch.  Berlin,  1868,  p.  343,  plate). 
Among  the  other  large  Rats  Mus  Imperator  from  the  Salomon-islands 
