﻿244 
  Mr. 
  H. 
  W. 
  Bates' 
  additions 
  to 
  the 
  

  

  Ventanas, 
  in 
  Durango. 
  All 
  the 
  examples 
  have 
  clear 
  

   reddish-tawny 
  antennae 
  (slightly 
  browner 
  in 
  some 
  Ven- 
  

   tanas 
  specimens), 
  and 
  palpi 
  and 
  reddish 
  tarsi, 
  the 
  

   labrum 
  in 
  some 
  cases 
  being 
  also 
  tawny 
  red. 
  Putzeys 
  

   gives 
  10 
  millim. 
  as 
  the 
  size. 
  In 
  a 
  large 
  series 
  taken 
  by 
  

   Herr 
  Hoge 
  the 
  length 
  varies 
  only 
  between 
  10 
  and 
  11|- 
  

   millim. 
  The 
  thorax 
  never 
  assumes 
  the 
  subeordate 
  form, 
  

   that 
  is, 
  distinctly 
  broader 
  before 
  the 
  middle, 
  the 
  arcuation 
  

   of 
  its 
  sides 
  being 
  generally 
  regular 
  ; 
  but 
  the 
  degree 
  of 
  

   arcuation 
  varies 
  much, 
  and 
  in 
  the 
  smaller 
  examples 
  the 
  

   widest 
  part 
  is 
  a 
  little 
  before 
  the 
  middle, 
  with 
  the 
  sides 
  

   thence 
  to 
  the 
  base 
  a 
  little 
  straighter 
  than 
  in 
  all 
  the 
  

   larger 
  and 
  more 
  typical 
  specimens, 
  so 
  that 
  there 
  is 
  

   little 
  to 
  distinguish 
  them 
  from 
  S. 
  arcuatus 
  (Putz.) 
  except 
  

   the 
  unicolorous 
  reddish 
  antennae 
  and 
  somewhat 
  longer 
  

   thorax. 
  In 
  the 
  ^ 
  the 
  four 
  anterior 
  tarsi 
  have 
  four 
  

   dilated 
  joints, 
  the 
  sides 
  of 
  the 
  2nd 
  — 
  4th 
  only 
  being 
  

   clothed 
  with 
  hair-scales 
  ; 
  the 
  middle 
  tibiae 
  are 
  slightly 
  

   arcuated, 
  but 
  not 
  denticulate 
  on 
  the 
  inner 
  side. 
  The 
  

   species 
  therefore 
  belongs 
  to 
  Selenophorus, 
  although 
  its 
  

   facies 
  and 
  form 
  of 
  thorax 
  are 
  those 
  of 
  Discoder 
  us. 
  

  

  Var. 
  S. 
  7iigrescens. 
  — 
  Eather 
  smaller 
  (9 
  millim.) 
  ; 
  legs 
  

   (including 
  tarsi) 
  and 
  antennae 
  black, 
  joints 
  1 
  — 
  2 
  red 
  ; 
  

   palpi 
  dull 
  reddish, 
  more 
  or 
  less 
  varied 
  with 
  black. 
  

   Thorax 
  nearly 
  as 
  in 
  the 
  type-form. 
  

  

  Hah. 
  Irapuato, 
  in 
  Guanajuato 
  ; 
  Mexico 
  City 
  ; 
  Aguas 
  

   Calientes 
  City 
  ; 
  Atenquique, 
  in 
  Jalisco 
  {Hoge). 
  

  

  A 
  good 
  series 
  of 
  examples. 
  This 
  form 
  seems 
  to 
  be 
  a 
  

   transition 
  stage 
  between 
  S. 
  crassiuscidus 
  and 
  S. 
  arcuatus. 
  

   A 
  dark 
  blue 
  variety 
  of 
  S. 
  nigrescens 
  is 
  not 
  uncommon. 
  

  

  Selenophorus 
  arcuatus, 
  Putzeys 
  (nee 
  Discoderus 
  amhly- 
  

   derus, 
  Bates, 
  Biol. 
  Centr.-Am., 
  Col., 
  i., 
  1, 
  p. 
  63). 
  

   Putzeys 
  distinguished 
  this 
  species 
  from 
  his 
  5*. 
  crassius- 
  

   cidus 
  by 
  its 
  smaller 
  size 
  (7i 
  millim.), 
  black 
  antennae, 
  

   with 
  the 
  two 
  first 
  joints 
  red, 
  and 
  the 
  broader, 
  more 
  

   transversal, 
  and 
  less 
  rounded 
  thorax. 
  These 
  characters 
  

   are 
  found 
  in 
  a 
  species 
  of 
  which 
  I 
  have 
  seen 
  many 
  

   examples 
  from 
  the 
  neighbourhood 
  of 
  Mexico 
  City, 
  and 
  

   which 
  in 
  some 
  individuals, 
  where 
  the 
  sides 
  of 
  the 
  thorax 
  

   are 
  more 
  arcuated 
  than 
  usual, 
  are 
  scarcely 
  distinguish- 
  

   able 
  from 
  the 
  smaller 
  specimens 
  of 
  S. 
  crassiuseulus 
  var. 
  

   nigrescens. 
  When 
  I 
  referred 
  S, 
  amhlyderus 
  to 
  the 
  same 
  

  

  