﻿Carahideons 
  fauna 
  of 
  Mexico. 
  245 
  

  

  species, 
  I 
  had 
  not 
  seeu 
  any 
  examples 
  of 
  the 
  male 
  of 
  

   S. 
  arcuatus, 
  many 
  of 
  which 
  have 
  since 
  been 
  received 
  

   and 
  prove 
  to 
  have 
  four 
  dilated 
  joints 
  to 
  the 
  four 
  anterior 
  

   tarsi, 
  with 
  the 
  soles 
  of 
  joints 
  2 
  — 
  4 
  only 
  squamulose, 
  and 
  

   simple 
  middle 
  tibiae, 
  precisely 
  as 
  in 
  S. 
  crassiusculus. 
  

   Putzeys' 
  species 
  must 
  therefore 
  be 
  retained 
  in 
  the 
  genus 
  

   Selenophorus. 
  D. 
  amhlyderus, 
  on 
  the 
  other 
  hand, 
  which 
  

   in 
  the 
  ? 
  is 
  with 
  great 
  difficulty 
  distinguishable 
  from 
  

   S. 
  arcuatus, 
  has 
  in 
  the 
  ^ 
  simple 
  anterior 
  tarsi, 
  and 
  the 
  

   middle 
  tibige 
  armed 
  on 
  the 
  inner 
  side 
  with 
  a 
  row 
  of 
  blunt 
  

   denticulations, 
  and 
  is 
  consequently 
  a 
  Discoderus, 
  though 
  

   the 
  middle 
  tibiae 
  are 
  not 
  more 
  arcuated 
  than 
  in 
  the 
  ^ 
  of 
  

   Selenophorus 
  crassiusculus. 
  Long. 
  Tg- 
  — 
  9 
  millim. 
  

  

  The 
  synonymy 
  will 
  stand 
  thus 
  : 
  — 
  

   Discoderus 
  amhlyderus. 
  

  

  = 
  Selenophorus 
  id.. 
  Bates, 
  Proc. 
  Zool. 
  Soc, 
  1878, 
  

   p. 
  691. 
  

  

  Discoderus 
  arcuatus, 
  id., 
  Biol. 
  Centr.-Am., 
  Col., 
  i., 
  1, 
  

   p. 
  63 
  (nee 
  S. 
  arcuatus, 
  Putz.). 
  

  

  Mexico 
  City, 
  Aguas 
  Calientes, 
  Jalapa 
  ; 
  Durango 
  City, 
  

   Cuernavaca. 
  

  

  The 
  thorax 
  is, 
  in 
  the 
  majority 
  of 
  the 
  individuals, 
  de- 
  

   cidedly 
  shorter 
  than 
  in 
  S. 
  arcuatus, 
  and 
  is 
  more 
  narrowed 
  

   behind, 
  but 
  the 
  arcuation 
  of 
  the 
  sides 
  varies 
  greatly. 
  

  

  Discoderus 
  dislocatus. 
  

  

  D. 
  acino])did'i 
  (Bates) 
  affinis 
  et 
  similis, 
  differt 
  colore 
  piceo-fusco 
  

   vix 
  asneo-tincto 
  striolaque 
  scutellari 
  brevi, 
  obliqua, 
  cuin 
  stria 
  '2nda 
  

   conjuncta 
  et 
  a 
  foveola 
  umbilicata 
  separata. 
  Facies 
  Acinopi, 
  

   oblongus, 
  convexus 
  politus 
  senescenti-fuscus, 
  palpis 
  antennis 
  tarsis- 
  

   que 
  testaceo-rufis 
  ; 
  thorace 
  Isevi 
  quadrato, 
  postice 
  perparum 
  angus- 
  

   tato 
  et 
  lateribus 
  paullulum 
  rotundatis, 
  angulis 
  posticis 
  rotundatis 
  ; 
  

   elytris 
  breviter 
  oblongis 
  acute 
  striatis, 
  punctorum 
  triplici 
  serie 
  

   minutis 
  vix 
  perspicuis, 
  striis 
  2nda, 
  5ta 
  et 
  7ta 
  contigiiis. 
  ? 
  tibiae 
  

   intermedias 
  paullo 
  curvatae 
  intus 
  simpliciter 
  ciliatse 
  ; 
  ventris 
  seg- 
  

   mentum 
  apicalen 
  utrinque 
  bipunctatum. 
  Long. 
  12 
  millim., 
  $ 
  . 
  

  

  Hah. 
  Durango 
  City 
  (Hoge). 
  

  

  In 
  form 
  of 
  body 
  and 
  in 
  the 
  simple 
  and 
  slight 
  curvature 
  

   of 
  the 
  middle 
  tibife 
  agrees 
  with 
  D. 
  acinopdides 
  of 
  the 
  

   same 
  sex, 
  but 
  differs 
  in 
  the 
  elytra 
  not 
  being 
  metallic 
  

   cupreous, 
  as 
  in 
  that 
  species, 
  and 
  in 
  the 
  curious 
  disloca- 
  

   tion 
  of 
  the 
  scutellar 
  stride, 
  which 
  in 
  D. 
  acinopdides, 
  as 
  

   in 
  other 
  allied 
  species, 
  proceeds 
  from 
  the 
  basal 
  umbili- 
  

  

  s2 
  

  

  