﻿South 
  American 
  species 
  of 
  Diabrotica. 
  437 
  

  

  third 
  joint 
  twice 
  as 
  long 
  as 
  the 
  second, 
  and 
  about 
  equal 
  in 
  length 
  

   to 
  the 
  fourth. 
  Prothorax 
  about 
  half 
  as 
  broad 
  again 
  as 
  long 
  ; 
  sides 
  

   parallel 
  and 
  feebly 
  sinuate 
  ffom 
  the 
  base 
  to 
  beyond 
  the 
  middle, 
  

   thence 
  converging 
  to 
  the 
  apex 
  ; 
  the 
  anterior 
  angles 
  slightly 
  tuber- 
  

   culate 
  ; 
  upper 
  surface 
  convex, 
  closely 
  but 
  somewhat 
  indistinctly 
  

   punctured. 
  Scutellum 
  black. 
  Elytra 
  closely 
  punctured, 
  fulvous, 
  

   each 
  with 
  six 
  small 
  somewhat 
  rounded 
  black 
  spots, 
  one 
  on 
  the 
  

   humeral 
  callus, 
  one 
  on 
  the 
  disk 
  nearly 
  half-way 
  between 
  the 
  basal 
  

   margin 
  and 
  the 
  middle, 
  two 
  placed 
  transversely 
  at 
  about 
  the 
  

   middle, 
  the 
  remaining 
  two 
  placed 
  slightly 
  obliquely 
  between 
  the 
  

   middle 
  and 
  the 
  apex. 
  

  

  The 
  above 
  characters 
  apply 
  to 
  two 
  specimens 
  in 
  the 
  

   B. 
  M. 
  collection. 
  In 
  a 
  specimen 
  from 
  Parana, 
  with 
  

   somewhat 
  shorter 
  antennae, 
  the 
  clypeus 
  has 
  a 
  more 
  

   distinct 
  longitudinal 
  carina, 
  and 
  the 
  upper 
  surface 
  of 
  

   the 
  prothorax 
  is 
  very 
  distinctly 
  punctured. 
  These 
  

   differences 
  are 
  perhaps 
  sexual. 
  I 
  cannot 
  regard 
  them 
  

   as 
  specific, 
  the 
  agreement 
  in 
  other 
  respects 
  being 
  so 
  

   extremely 
  close. 
  

  

  64. 
  Diabrotica 
  biseriata, 
  Gahan, 
  sp. 
  n. 
  

  

  Oblongo-ovata, 
  postice 
  ampliata, 
  sordide 
  fulva, 
  capite 
  antennis 
  

   (his 
  basi 
  apiceque 
  exceptis) 
  pectore 
  et 
  macuhs 
  octo 
  subquadratis 
  

   elytrorum 
  (quatuor 
  ad 
  basin 
  transversim 
  — 
  quatuor 
  versus 
  apicem 
  

   subarcuatim 
  — 
  positis) 
  nigris 
  ; 
  prothoracis 
  dorso 
  nitido, 
  obsolete 
  

   punctulato, 
  antice 
  utrinque 
  bifoveolato 
  ; 
  elytris 
  crebre 
  punctulatis, 
  

   utrisque 
  pone 
  humerum 
  longitudinaliter 
  subsulcatis. 
  Long, 
  

   7 
  — 
  9 
  mm. 
  

  

  Hab. 
  Brazil, 
  Parana. 
  

  

  Head 
  black, 
  rather 
  short 
  in 
  front, 
  with 
  a 
  median 
  foveolate 
  im- 
  

   pression 
  above 
  the 
  insertion 
  of 
  the 
  antennae 
  ; 
  these 
  rather 
  longer 
  

   than 
  half 
  the 
  body, 
  black, 
  with 
  the 
  first 
  three 
  joints, 
  the 
  last 
  two 
  

   joints, 
  and 
  the 
  under 
  side 
  of 
  the 
  fourth 
  joint, 
  fulvous; 
  third 
  joint 
  

   almost 
  three 
  times 
  as 
  long 
  as 
  the 
  second, 
  and 
  nearly 
  equal 
  in 
  

   length 
  to 
  the 
  fourth. 
  Prothorax 
  with 
  length 
  to 
  breadth 
  as 
  3 
  to 
  2 
  ; 
  

   disk 
  nitid, 
  obsoletely 
  punctulate, 
  with 
  a 
  feeble 
  foveolate 
  impression 
  

   on 
  each 
  side 
  before 
  the 
  middle. 
  Elytra 
  closely 
  punctate, 
  with 
  a 
  

   short 
  and 
  feeble 
  longitudinal 
  groove 
  on 
  each 
  side 
  behind 
  the 
  

   shoulder 
  ; 
  each 
  with 
  four 
  somewhat 
  square 
  or 
  oblong 
  black 
  spots, 
  

   two 
  placed 
  transversely 
  at 
  the 
  base, 
  two 
  slightly 
  obliquely 
  between 
  

   the 
  middle 
  and 
  the 
  apex; 
  with 
  the 
  parts 
  surrounding 
  the 
  black 
  

   spots 
  somewhat 
  paler 
  in 
  colour 
  than 
  the 
  rest 
  of 
  the 
  surface. 
  

   Breast 
  black 
  ; 
  legs 
  and 
  rest 
  of 
  the 
  under 
  side 
  of 
  the 
  body 
  fulvous. 
  

  

  2g2 
  

  

  