﻿56 
  Mr. 
  J. 
  O. 
  Westwood 
  on 
  the 
  

  

  inter 
  partem 
  anticam 
  oculorum 
  obsoletis. 
  Labrum 
  trans- 
  

   versum, 
  lutescens, 
  fusco 
  tenuissime 
  marginatum, 
  denticulis 
  

   duobus 
  mediis 
  parum 
  prominentibus. 
  Mandibulae 
  et 
  antennae 
  

   lutescentes, 
  illarum 
  dentibus 
  nigris, 
  harum 
  articulis 
  4 
  basali- 
  

   bus 
  supra 
  Aisco-notatis. 
  Prothorax 
  subquadratus, 
  capite 
  

   paullo 
  angustior, 
  postice 
  vix 
  angustior, 
  lateribus 
  fere 
  rectis, 
  

   sulco 
  profundo 
  angusto 
  sinuato 
  antico, 
  alteroque 
  recto 
  postico 
  

   transversis 
  ; 
  lineaque 
  media 
  ordinaria 
  profunde 
  impressa 
  ; 
  

   dorso 
  laevi, 
  cupreo-viridi, 
  lateribus 
  sulcoque 
  antico 
  tenuissime 
  

   punctatis, 
  parte 
  postica 
  pone 
  sulcum 
  posticum 
  irregulariter 
  

   granulata. 
  Elytra 
  elongato-ovalia, 
  disco 
  granulis 
  conicis 
  

   minutis 
  scabro, 
  cupreo-viridia, 
  singulo 
  macula 
  elongata 
  laterali 
  

   lutescenti 
  postica, 
  ad 
  apicem 
  suturas 
  extensa, 
  singuloque 
  in 
  

   spinam 
  acutam 
  sensim 
  desinente. 
  Corpus 
  infra 
  viride, 
  ab- 
  

   domine 
  lutescente. 
  Pedes 
  lutescentes, 
  femoribus 
  4 
  posticis 
  

   ante 
  apicem 
  fusco-nebulosis. 
  

  

  Tbe 
  following 
  is 
  a 
  tabular 
  classification 
  of 
  the 
  species 
  oi^ 
  Mega- 
  

   cephala, 
  showing 
  the 
  position 
  of 
  the 
  subgenera 
  indicated 
  above, 
  

   founded 
  for 
  the 
  most 
  part 
  on 
  the 
  variations 
  in 
  the 
  dentition 
  of 
  the 
  

   mandibles. 
  This 
  is 
  a 
  character 
  which 
  has 
  been 
  generally 
  over- 
  

   looked 
  by 
  Entomologists, 
  although 
  the 
  use 
  made 
  of 
  it 
  in 
  the 
  

   higher 
  branches 
  of 
  zoology 
  show 
  its 
  great 
  value. 
  It 
  is 
  true 
  indeed 
  

   that 
  in 
  most 
  modern 
  generic 
  descriptions 
  the 
  form 
  of 
  the 
  mandible 
  

   is 
  given, 
  but 
  this 
  is 
  drawn 
  almost 
  universally 
  from 
  the 
  inspection 
  

   and 
  figure 
  of 
  a 
  single 
  jaw, 
  whilst 
  the 
  comparative 
  form 
  of 
  the 
  two 
  

   mandibles, 
  and 
  the 
  mode 
  in 
  which 
  their 
  combined 
  action 
  modifies 
  

   the 
  form 
  and 
  position 
  of 
  their 
  relative 
  toothing, 
  is 
  generally 
  

   neglected. 
  The 
  genus 
  Megacephala 
  was 
  first 
  divided 
  by 
  Serville 
  

   and 
  St. 
  Fargeau, 
  in 
  the 
  Encyclopedie 
  Methodique, 
  into 
  two 
  

   sections, 
  from 
  the 
  wingless 
  and 
  winged 
  condition 
  of 
  the 
  species, 
  

   the 
  name 
  of 
  Jptema 
  being 
  given 
  to 
  the 
  former 
  group, 
  the 
  type 
  of 
  

   which 
  was 
  however 
  that 
  of 
  the 
  genus 
  Megacephala, 
  whilst 
  a 
  second 
  

   species 
  was 
  added 
  (M. 
  4-signata), 
  which 
  is 
  certainly 
  winged. 
  

   Mr. 
  Hope, 
  in 
  the 
  second 
  part 
  of 
  his 
  Coleopterist's 
  Manual 
  (p. 
  6), 
  

   restored 
  the 
  generic 
  name 
  Megacephala 
  to 
  the 
  type 
  M. 
  Senegalensis, 
  

   dividing 
  it 
  into 
  two 
  sections, 
  1st, 
  that 
  containing 
  the 
  type, 
  destitute 
  

   of 
  wings, 
  and, 
  2nd, 
  that 
  containing 
  M. 
  4-signata 
  and 
  Euphratica, 
  

   both 
  of 
  which 
  are 
  winged, 
  adding 
  two 
  new 
  genera, 
  Tetracha, 
  

   Westw., 
  containing 
  Cic. 
  Carolina, 
  Linn., 
  and 
  its 
  allies, 
  natives 
  of 
  

   the 
  New 
  World, 
  having 
  the 
  mandibles 
  armed 
  with 
  four 
  apical 
  

   teeth, 
  and 
  Anaira, 
  the 
  type 
  of 
  which 
  is 
  M. 
  sepulchralis. 
  A 
  nearly 
  

   similar 
  arrangement 
  was 
  adopted 
  by 
  M. 
  Lacordaire 
  in 
  his 
  revision 
  

  

  