NEW  GENERA  AND  SPECIES  OF  COLEOPTEROUS  INSECTS. 
95 
Stirps,  Malacodermata,  Lat. 
Fam,  TiLLiD^,  Leach. 
Genus.  Opilus,  Lat. 
Opilus  auripennis. 
Tab.  XIIT.  Fig.  5. 
Op.  ater ;  thorace  nigro  ;  elytris  auratis  nitidissimis ;  pedibus  nigricantibus. 
Long,  corporis  7  lin.  ;  lat.  2. 
Hab.  in  Brasilia,  juxta  Rio  Janeiro. 
Mus.  Hope. 
Descr.  AntenruB  nigrse,  pubescentes,  articulis  tribus  apicalibus  maximis  interne  valde 
productis.  Palpi  nigro-picei.  Thorax  ater  nitidus,  foveola  media  impressa,  sub- 
tilissime  punctatus,  ante  medium  contractus,  lateribus  pone  medium  rotundato- 
dilatatis.  Elytra  viridi-aurata  nitidissima,  antice  fortissime  punctata,  postice  gla- 
berrima  nitoreque  flammifero  fulgentia.  Corpus  subtus  nigrum,  punctatum.  Pedes 
pilis  albidis  obsiti.    Tarsi  infra  flavi,  spongiosi. 
Variat  thorace  rubro ;  antennis  pedibusque  rufescentibus.    Forte  specimen  immaturum. 
This  Brazilian  insect  is  most  nearly  allied  to  Opilus  :  it  will,  however,  probably  form,, 
a  subgenus.  Its  chief  differences  consist  in  the  variation  of  the  joints  of  the  club  of 
the  antennae,  and  in  the  bluntness  of  the  mandibular  teeth  as  compared  with  those  of 
Opilus.  The  last  three  joints  of  the  antenna  in  the  latter  genus  are  widely  different ;  the 
ninth  and  tenth  are  trigonate,  and  the  eleventh  is  obliquely  truncated :  in  the  present 
insect  the  ninth  and  tenth  are  trigonate  with  a  deep  incision,  and  the  eleventh  is  ovate 
and  depressed.  Another  remarkable  distinction  exists  between  this  insect  and  the 
Opili  generally  :  its  tarsi  are  only  four-jointed,  the  basal  articulation  usually  found  in 
that  genus  not  being  here  observable.  With  these  exceptions,  its  characters  are  those 
of  the  other  Opili. 
Stirps.  Lamellicornes,  Lat. 
Fam.  ScARABiEiDiE,  MacLeay. 
Subfam.  Coprides. 
Genus.  Coptorhina'. 
Caput  magnum,  ecorne  :  clypeo  profundissim^  inciso  (scil.  dente  forti  utrinque 
porrecto) . 
'  KoTrrw,  scindo ;  ph',  nasus. 
