﻿Coleopterous 
  Genus 
  Megacephala. 
  53 
  

  

  Sp. 
  5. 
  M. 
  cruciata, 
  Brulle 
  in 
  D'Orbigny, 
  Voy. 
  Amer. 
  merid. 
  

   VI. 
  ii. 
  p. 
  2, 
  pi. 
  1, 
  f. 
  2. 
  

  

  Depressa.. 
  flavo-rufa, 
  subtus 
  palHdior 
  ; 
  ore, 
  antennis 
  pedibusque 
  

   flavis 
  ; 
  elytrorum 
  vittasuturalifasciaque 
  fuscis. 
  Mas. 
  Long. 
  

   7 
  1, 
  b'n. 
  

  

  Nortbern 
  part 
  of 
  Corrientes, 
  on 
  a 
  sand 
  bank 
  at 
  Parana. 
  

  

  One-fourtb 
  smaller 
  tban 
  M. 
  hifasciata, 
  witb 
  tbe 
  elytra 
  very 
  

   strongly 
  punctured, 
  and 
  without 
  the 
  black 
  band 
  between 
  the 
  eyes 
  ; 
  

   the 
  denticulations 
  of 
  the 
  labrum 
  are 
  also 
  more 
  porrected. 
  It 
  runs 
  

   with 
  very 
  great 
  agility, 
  and 
  " 
  semble 
  plutot 
  voler 
  que 
  marcher.'' 
  

  

  Messrs. 
  Tatum 
  and 
  S. 
  Stevens 
  regard 
  this 
  supposed 
  species 
  as 
  

   a 
  very 
  pale 
  variety 
  of 
  the 
  preceding, 
  which, 
  indeed, 
  greatly 
  differs, 
  

   in 
  the 
  extent 
  of 
  its 
  markings, 
  some 
  specimens 
  having 
  the 
  disc 
  of 
  

   the 
  elytra 
  almost 
  entirely 
  black. 
  Mr. 
  Bates' 
  capture 
  of 
  spe- 
  

   cimens 
  in 
  a 
  single 
  locality, 
  apart 
  from 
  that 
  which 
  afforded 
  the 
  

   true 
  M. 
  hifasciata, 
  is 
  in 
  favour 
  of 
  their 
  specific 
  distinction. 
  

  

  Sp. 
  6. 
  M. 
  asperula, 
  Westwood.* 
  (Tab. 
  VII. 
  f. 
  8.) 
  

   Testaceo-lutea 
  ; 
  antennis, 
  palpis 
  et 
  pedibus 
  albidis 
  ; 
  capite 
  in 
  

   medio 
  fusco, 
  elytrorum 
  sutura 
  late, 
  fasciaque 
  utrinque 
  abbre- 
  

   viata 
  pone 
  medium 
  fuscis, 
  pronoto 
  antice 
  et 
  postice 
  elytrisque 
  

   undique 
  granulato-asperulis, 
  his 
  brevibus 
  latis 
  obovatis. 
  

   Long. 
  Corp. 
  lin. 
  5. 
  

  

  Syn. 
  il/. 
  brevis 
  and 
  M. 
  brevipennis, 
  MS. 
  in 
  museis. 
  

  

  * 
  Obs.— 
  The 
  five 
  species 
  above 
  mentioned 
  are 
  the 
  only 
  ones 
  hitherto 
  known 
  

   belonging 
  to 
  the 
  pallid 
  division 
  of 
  the 
  genus. 
  I 
  liieiefore 
  take 
  this 
  opportunity 
  

   of 
  describing 
  another 
  new 
  species, 
  from 
  the 
  collection 
  of 
  T. 
  Tatum, 
  Esq., 
  who 
  

   received 
  it 
  from 
  the 
  Jardin 
  des 
  Plantes, 
  without 
  any 
  indication 
  of 
  its 
  locality. 
  

  

  Megacephala 
  Oxycheilnides, 
  Blaachard, 
  MS. 
  

   M. 
  nigricollis, 
  Reiche. 
  

  

  M. 
  nigra, 
  baud 
  nitida, 
  depressa 
  ; 
  capite 
  antice, 
  antennis, 
  pedibus, 
  elytris 
  

   utrinque 
  macula 
  magna 
  triangular! 
  lalerali, 
  alterisque 
  duabus 
  apicalibus 
  

   albidis 
  J 
  . 
  Long. 
  corp. 
  lin. 
  85. 
  

  

  Prascedentibus 
  magis 
  depressa 
  coloreque 
  nigro 
  corporis, 
  capitis 
  et 
  pronoti 
  dis- 
  

   tincta. 
  Caput 
  subquadratum, 
  oculis 
  prominulis, 
  vertice 
  planiusculo 
  sub 
  lente 
  

   striatulo, 
  macula 
  antica 
  semicirculari 
  albida. 
  Labrum 
  transversum, 
  albidum, 
  

   medio 
  antice 
  valde 
  porrectum, 
  denticulis 
  duobus 
  centralibusacutis 
  alterisque 
  

   duobus 
  lateralibus, 
  dentibus 
  apice 
  castaneis. 
  Mandibulaj 
  albidas, 
  dextera 
  

   dentibus 
  tribus 
  validis 
  apicalibus, 
  sinistra 
  tribus 
  intermedio 
  parvo. 
  Palpi 
  

   albidi, 
  labiales 
  articulo 
  penultimo 
  valde 
  setoso, 
  ultimo 
  paullo 
  securiformi. 
  

   Pronotum 
  truncato-cordatum, 
  subdepressum, 
  impressionibus 
  duabus 
  trans- 
  

   versis 
  ordinariis 
  fere 
  obsolelis, 
  media 
  longitudinali 
  lenui, 
  disci 
  medio 
  lajvi, 
  

   antice 
  et 
  postice 
  sub 
  lente 
  tenuissime 
  coriaceo. 
  Elytra 
  suboblonga, 
  depressa, 
  

   fere 
  parallela, 
  depressa, 
  disco 
  undique 
  granulis 
  minulis 
  conicis 
  (apicibus 
  

   postice 
  directis) 
  ; 
  nigra, 
  singulo 
  macula 
  magna 
  laterali 
  irregulariter 
  trian- 
  

   gulari, 
  suluram 
  baud 
  atlingente, 
  e 
  basi 
  ad 
  medium 
  lateraliterextensa, 
  altei-a- 
  

   que 
  subovali 
  apicali. 
  Corpus 
  infra 
  nigrum, 
  laeve, 
  suboilidum 
  ; 
  apice 
  seg- 
  

   ment! 
  apicalis 
  abdominis 
  albido. 
  Pedes 
  oranino 
  albidi. 
  

  

  