﻿South 
  American 
  species 
  of 
  Diahrotica. 
  465 
  

  

  124. 
  Diahrotica 
  marginicollis, 
  Gahan, 
  sp. 
  n. 
  

  

  Capite 
  protlaoracisque 
  dorso 
  (hoc 
  margine 
  lateral! 
  excepto) 
  atro- 
  

   cyaneis 
  ; 
  prothorace 
  dense 
  distincteque 
  punctato, 
  utrinque 
  leviter 
  

   foveolato 
  ; 
  scutello 
  nigro 
  ; 
  elytris 
  fortiter 
  rugoso-punctatis, 
  pur- 
  

   pnreo-rufescentibus 
  ; 
  cori)ore 
  subtus 
  (prothorace 
  flavo 
  excepto) 
  

   tibiis 
  tarsisque 
  nigris 
  ; 
  femoribus 
  antennisque 
  flavescentibus. 
  Long. 
  

   8 
  mm. 
  

  

  Hah 
  Colombia. 
  

  

  Head 
  blue-black 
  ; 
  front 
  carinate 
  along 
  the 
  middle, 
  punctured 
  at 
  

   each 
  side 
  below 
  the 
  insertion 
  of 
  the 
  antenna 
  ; 
  vertex 
  with 
  a 
  median 
  

   fovea 
  between 
  the 
  eyes. 
  Prothorax 
  transverse 
  ; 
  sides 
  nearly 
  

   parallel; 
  disk 
  thickly 
  and 
  distinctly 
  punctured, 
  with 
  a 
  fovea 
  on 
  

   each 
  side, 
  and 
  a 
  short 
  feeble 
  median 
  longitudinal 
  impression 
  close 
  

   to 
  the 
  base, 
  its 
  colour 
  dark 
  blue, 
  with 
  the 
  narrow 
  reflexed 
  lateral 
  

   borders 
  yellowish, 
  like 
  the 
  under 
  side. 
  Scutellum 
  black, 
  nitid, 
  

   impunctate. 
  Elytra 
  closely, 
  strongly, 
  and 
  somewhat 
  rugosely 
  

   punctured 
  ; 
  dark 
  red 
  with 
  a 
  pui'plish 
  tint. 
  

  

  This 
  species 
  has 
  at 
  first 
  sight 
  a 
  strong 
  resemblance 
  to 
  

   D. 
  chriisopleura, 
  Harold 
  (Sect. 
  I.). 
  The 
  coloration 
  of 
  

   the 
  elytra 
  is 
  almost 
  exactly 
  the 
  same 
  in 
  both 
  species. 
  

   Harold 
  has 
  described 
  this 
  colour 
  as 
  obscure 
  purple, 
  but 
  

   Baly 
  (Trans. 
  Ent. 
  Soc. 
  Lond., 
  1890, 
  p. 
  85) 
  thought 
  it 
  

   better 
  described 
  as 
  *' 
  rufous, 
  more 
  or 
  less 
  stained 
  with 
  

   piceous." 
  

  

  125. 
  Diahrotica 
  hehe, 
  Baly. 
  

  

  Trans. 
  Ent. 
  Soc. 
  Lond., 
  1865, 
  p. 
  348 
  ; 
  Journ. 
  Linn. 
  

   Soc, 
  xix., 
  p. 
  241. 
  

  

  Hah. 
  Colombia. 
  

  

  126. 
  Diahrotica 
  gihhosa, 
  Baly. 
  

   Trans. 
  Ent. 
  Soc. 
  Lond., 
  1886, 
  p. 
  450. 
  

   Hah. 
  Ecuador. 
  

  

  127. 
  Diahrotica 
  opacipennis, 
  Baly. 
  

   Ann. 
  and 
  Mag. 
  Nat. 
  Hist., 
  5th 
  ser., 
  iii., 
  p. 
  182, 
  

   Hah. 
  Ecuador. 
  

  

  