﻿TRANSACTIONS 
  

  

  ENTOMOLOGICAL 
  SOCIETY 
  

  

  LONDON. 
  

  

  I. 
  Description 
  of 
  Doubledaya 
  Viator, 
  an 
  apparently 
  unde- 
  

   scribed 
  Suh-genus 
  and 
  Species 
  of 
  Coleoptera 
  belonging 
  to 
  

   the 
  Family 
  Languriadse. 
  By 
  Adam 
  White, 
  Esq., 
  F.L.S. 
  

  

  [Read 
  May 
  6th, 
  1850] 
  

  

  The 
  family 
  Langur'iadce 
  contains 
  a 
  not 
  very 
  numerous 
  set 
  of 
  in- 
  

   sects, 
  which, 
  among 
  the 
  Trimera, 
  in 
  some 
  way 
  represent 
  the 
  Ela- 
  

   teridce 
  among 
  the 
  serricorn 
  Pentamera. 
  Their 
  form 
  is 
  elongated, 
  

   the 
  elytra 
  in 
  most 
  of 
  the 
  species 
  are 
  of 
  a 
  metallic 
  blue 
  or 
  green, 
  

   and 
  die 
  thorax 
  in 
  several 
  is 
  red, 
  or 
  red 
  with 
  a 
  black 
  mark 
  or 
  line. 
  

   In 
  the 
  genus 
  Languria 
  the 
  antennae 
  are 
  not 
  quite 
  the 
  length 
  of 
  

   the 
  head 
  and 
  thorax 
  put 
  together, 
  and 
  they 
  terminate 
  in 
  a 
  flat- 
  

   tened 
  expansion, 
  consisting 
  of 
  five 
  joints. 
  In 
  the 
  genus 
  Fatua 
  of 
  

   Dejean, 
  the 
  joints 
  of 
  the 
  antennas 
  are 
  much 
  lengthened; 
  and 
  the 
  

   club 
  or 
  mass 
  at 
  the 
  end, 
  excepting 
  its 
  three 
  terminal 
  joints, 
  which 
  

   are 
  small, 
  is 
  not 
  much 
  wider 
  than 
  the 
  other 
  joints. 
  The 
  legs 
  too 
  

   are 
  much 
  longer, 
  the 
  fore 
  ones 
  being 
  not 
  much 
  shorter 
  than 
  the 
  

   whole 
  length 
  of 
  the 
  insect, 
  and 
  the 
  two 
  other 
  pairs 
  are 
  at 
  least 
  

   as 
  long 
  as 
  the 
  abdomen.* 
  In 
  both 
  the 
  tarsi, 
  though 
  well 
  de- 
  

   veloped, 
  are 
  not 
  particularly 
  remarkable 
  for 
  size. 
  The 
  genus 
  

   Triiicus 
  of 
  Thunberg 
  (Kongl. 
  Vetenskaps 
  Academiens 
  nya 
  Hand- 
  

   lingar, 
  xxv. 
  ISOJ', 
  p. 
  184), 
  is 
  synonymous 
  with 
  Languria, 
  or 
  

   nearly 
  so. 
  Its 
  generic 
  character 
  is 
  having 
  perfoliate 
  antennae, 
  

   with 
  a4-jointed 
  club; 
  three 
  of 
  the 
  joints 
  are 
  lunate, 
  and 
  the 
  last 
  is 
  

   globose; 
  the 
  thorax 
  is 
  quadrate 
  and 
  the 
  angles 
  are 
  acute. 
  The 
  body 
  

  

  * 
  In 
  the 
  genus 
  Macromera, 
  Hope 
  (Trans. 
  Zool. 
  Society), 
  the 
  legs 
  and 
  antennae 
  

   are 
  very 
  long. 
  

  

  VOL. 
  II. 
  N. 
  S. 
  PARTI. 
  JUNE, 
  1852. 
  B 
  

  

  