﻿230 
  Mr. 
  H. 
  W. 
  Bates' 
  additions 
  to 
  the 
  

  

  HeiT 
  Hoge 
  with 
  the 
  above 
  locahty, 
  are 
  conformable 
  to 
  

   the 
  diagnosis 
  given 
  above, 
  whilst 
  all 
  those 
  ticketed 
  

   "Ciudad" 
  belong 
  to 
  S. 
  mexicanus, 
  in 
  which 
  the 
  hind 
  

   angles 
  of 
  the 
  thorax 
  are 
  only 
  moderately 
  produced, 
  i. 
  e., 
  

   not 
  prolonged 
  into 
  a 
  fine 
  point, 
  and 
  the 
  elytra 
  closely 
  

   and 
  strongly 
  j)unctate-striated 
  with 
  narrow 
  raised 
  inter- 
  

   stices. 
  The 
  general 
  form 
  in 
  S. 
  macrogonus 
  is 
  also 
  rela- 
  

   tively 
  broader, 
  and 
  the 
  thorax 
  is 
  also 
  a 
  little 
  broader 
  and 
  

   more 
  quadrate 
  ; 
  but 
  S. 
  mexicanus 
  varies 
  greatly 
  in 
  these 
  

   respects, 
  the 
  thorax 
  being 
  sometimes 
  strongly 
  cordate, 
  

   and 
  more 
  generally 
  slightly 
  cordate, 
  but 
  in 
  some 
  

   examples 
  nearly 
  quadrate, 
  and 
  the 
  elytra 
  more 
  or 
  less 
  

   ovate, 
  and 
  often 
  oblong 
  or 
  subelongate 
  ; 
  so 
  that 
  reliance 
  

   cannot 
  be 
  placed 
  on 
  that 
  character. 
  The 
  colour 
  in 
  

   S. 
  macrogonus 
  is 
  generally 
  violet-black, 
  most 
  con- 
  

   spicuously 
  so 
  on 
  the 
  elytra. 
  

  

  Pasimachus 
  duplicatus, 
  Leconte, 
  Trans. 
  Am. 
  Phil. 
  Soc, 
  

   X., 
  p. 
  395 
  (1853) 
  ; 
  Bull. 
  Buffalo 
  Soc 
  Nat. 
  Sci., 
  1874, 
  

   p. 
  271 
  ; 
  P. 
  costifer, 
  id., 
  Proc. 
  Acad. 
  Nat. 
  Sci. 
  Phil., 
  

   1854, 
  79. 
  

  

  Var. 
  elytris 
  Isevibus. 
  

  

  Hah. 
  Nuevo 
  Laredo, 
  in 
  Tamaulipas 
  (Hoge) 
  ; 
  North 
  

   America, 
  Texas 
  to 
  Missouri. 
  

  

  The 
  Mexican 
  examples 
  have 
  no 
  trace 
  of 
  the 
  geminated 
  

   rows 
  of 
  punctures 
  on 
  the 
  elytra, 
  which 
  Leconte 
  states 
  is 
  

   also 
  the 
  case 
  with 
  some 
  of 
  the 
  Texan 
  specimens, 
  and 
  the 
  

   two 
  lateral 
  carinae 
  are 
  well-developed, 
  the 
  inner 
  one 
  

   being 
  sometimes 
  as 
  long 
  as 
  the 
  outer. 
  

  

  Pasimachus 
  ignicinctus. 
  

   P. 
  mexicano 
  affinis, 
  parum 
  convexus 
  niger 
  subopacus, 
  thorace 
  

   (antice 
  excepto) 
  et 
  elytris 
  anguste 
  cupreo-aurato-marginatis 
  ; 
  ely- 
  

   tris 
  basi 
  et 
  apud 
  hnroeros 
  latius 
  splendide 
  igneo-aui'atis, 
  basi 
  a 
  

   humeris 
  usque 
  ad 
  pedunculum 
  parum 
  rotundato, 
  carinula 
  humerali 
  

   DuUa, 
  passim 
  Ifevibus 
  striis 
  nonnullis 
  punctulatis 
  versus 
  apicem 
  

   vix 
  perspicuis. 
  Long. 
  28 
  millim. 
  

  

  Hab. 
  Canelas, 
  Sierra 
  Madre 
  of 
  Durango 
  {Flohr 
  in 
  

   Coll. 
  Bates). 
  

  

  The 
  thorax 
  resembles 
  in 
  form 
  that 
  of 
  P. 
  viridajis 
  

   (Lee.) 
  more 
  than 
  that 
  of 
  P. 
  mexicanus, 
  being 
  transverse 
  

  

  